Author + information
- Published online December 6, 2011.
- Glenn N. Levine, MD, FACC, FAHA, Chair, Writing Committee Member†,
- Eric R. Bates, MD, FACC, FAHA, Vice Chair, Writing Committee Member⁎,†,
- James C. Blankenship, MD, FACC, FSCAI, Vice Chair, Writing Committee Member⁎,‡,
- Steven R. Bailey, MD, FACC, FSCAI, Writing Committee Member⁎,‡,
- John A. Bittl, MD, FACC, Writing Committee Member†,§,
- Bojan Cercek, MD, FACC, FAHA, Writing Committee Member†,
- Charles E. Chambers, MD, FACC, FSCAI, Writing Committee Member‡,
- Stephen G. Ellis, MD, FACC, Writing Committee Member⁎,†,
- Robert A. Guyton, MD, FACC, Writing Committee Member⁎∥,
- Steven M. Hollenberg, MD, FACC, Writing Committee Member⁎,†,
- Umesh N. Khot, MD, FACC, Writing Committee Member⁎,†,
- Richard A. Lange, MD, FACC, FAHA, Writing Committee Member§,
- Laura Mauri, MD, MSc, FACC, FSCAI, Writing Committee Member⁎,†,
- Roxana Mehran, MD, FACC, FAHA, FSCAI, Writing Committee Member⁎,‡,
- Issam D. Moussa, MD, FACC, FAHA, FSCAI, Writing Committee Member‡,
- Debabrata Mukherjee, MD, FACC, FSCAI, Writing Committee Member†,
- Brahmajee K. Nallamothu, MD, FACC, Writing Committee Member¶ and
- Henry H. Ting, MD, FACC, FAHA†
- ACCF/AHA Practice Guidelines
- acute coronary syndromes
- antiplatelet agents
- arrhythmias, cardiac
- coronary angiography
- coronary artery revascularization interventions: stents
- drug therapy
- drug delivery systems
- heart diseases
- myocardial revasularization
- platelet aggregation inhibitor
ACCF/AHA Task Force Members
Alice K. Jacobs, MD, FACC, FAHA, Chair
Jeffrey L. Anderson, MD, FACC, FAHA, Chair-Elect
Nancy Albert, PhD, CCNS, CCRN, FAHA
Mark A. Creager, MD, FACC, FAHA
Steven M. Ettinger, MD, FACC
Robert A. Guyton, MD, FACC
Jonathan L. Halperin, MD, FACC, FAHA
Judith S. Hochman, MD, FACC, FAHA
Frederick G. Kushner, MD, FACC, FAHA
E. Magnus Ohman, MD, FACC
William Stevenson, MD, FACC, FAHA
Clyde W. Yancy, MD, FACC, FAHA
Table of Contents
1.1 Methodology and Evidence Review......e48
1.2 Organization of the Writing Committee......e49
1.3 Document Review and Approval......e49
1.4 PCI Guidelines: History and Evolution......e49
2. CAD Revascularization......e50
2.1 Heart Team Approach to Revascularization Decisions: Recommendations......e50
2.2 Revascularization to Improve Survival: Recommendations......e52
2.3 Revascularization to Improve Symptoms: Recommendations......e53
2.4 CABG Versus Contemporaneous Medical Therapy......e53
2.5 PCI Versus Medical Therapy......e54
2.6 CABG Versus PCI......e54
2.6.1 CABG Versus Balloon Angioplasty or BMS......e54
2.6.2 CABG Versus DES......e55
2.7 Left Main CAD......e55
2.7.1 CABG or PCI Versus Medical Therapy for Left Main CAD......e55
2.7.2 Studies Comparing PCI Versus CABG for Left Main CAD......e56
2.7.3 Revascularization Considerations for Left Main CAD......e56
2.8 Proximal LAD Artery Disease......e57
2.9 Clinical Factors That May Influence the Choice of Revascularization......e57
2.9.1 Diabetes Mellitus......e57
2.9.2 Chronic Kidney Disease......e57
2.9.3 Completeness of Revascularization......e58
2.9.4 LV Systolic Dysfunction......e58
2.9.5 Previous CABG......e58
2.9.6 Unstable Angina/Non–ST-Elevation Myocardial Infarction......e58
2.9.7 DAPT Compliance and Stent Thrombosis: Recommendation......e58
2.10 TMR as an Adjunct to CABG......e59
2.11 Hybrid Coronary Revascularization: Recommendations......e59
3. PCI Outcomes......e59
3.1 Definitions of PCI Success......e59
3.1.1 Angiographic Success......e60
3.1.2 Procedural Success......e60
3.1.3 Clinical Success......e60
3.2 Predictors of Clinical Outcome After PCI......e60
3.3 PCI Complications......e60
4. Preprocedural Considerations......e61
4.1 Cardiac Catheterization Laboratory Requirements......e61
4.1.3 ‘Time-Out' Procedures......e62
4.2 Ethical Aspects......e63
4.2.1 Informed Consent......e63
4.2.2 Potential Conflicts of Interest......e63
4.3 Radiation Safety: Recommendation......e63
4.4 Contrast-Induced AKI: Recommendations......e63
4.5 Anaphylactoid Reactions: Recommendations......e64
4.6 Statin Treatment: Recommendation......e65
4.7 Bleeding Risk: Recommendation......e65
4.8 PCI in Hospitals Without On-Site Surgical Backup: Recommendations......e65
5. Procedural Considerations......e65
5.1 Vascular Access: Recommendation......e65
5.2 PCI in Specific Clinical Situations......e66
5.2.1 UA/NSTEMI: Recommendations......e66
5.2.2 ST-Elevation Myocardial Infarction......e68
220.127.116.11 Coronary Angiography Strategies in STEMI: Recommendations......e68
18.104.22.168 Primary PCI of the Infarct Artery: Recommendations......e69
22.214.171.124 Delayed or Elective PCI in Patients With STEMI: Recommendations......e69
5.2.3 Cardiogenic Shock: Recommendations......e70
126.96.36.199 Procedural Considerations for Cardiogenic Shock......e70
5.2.4 Revascularization Before Noncardiac Surgery: Recommendations......e71
5.3 Coronary Stents: Recommendations......e71
5.4 Adjunctive Diagnostic Devices......e73
5.4.1 FFR: Recommendation......e73
5.4.2 IVUS: Recommendations......e73
5.4.3 Optical Coherence Tomography......e73
5.5 Adjunctive Therapeutic Devices......e74
5.5.1 Coronary Atherectomy: Recommendations......e74
5.5.2 Thrombectomy: Recommendation......e74
5.5.3 Laser Angioplasty: Recommendations......e74
5.5.4 Cutting Balloon Angioplasty: Recommendations......e74
5.5.5 Embolic Protection Devices: Recommendation......e74
5.6 Percutaneous Hemodynamic Support Devices: Recommendation......e74
5.7 Interventional Pharmacotherapy......e75
5.7.1 Procedural Sedation......e75
5.7.2 Oral Antiplatelet Therapy: Recommendations......e75
5.7.3 IV Antiplatelet Therapy: Recommendations......e77
5.7.4 Anticoagulant Therapy......e78
188.8.131.52 Use of Parenteral Anticoagulants During PCI: Recommendation......e78
184.108.40.206 UFH: Recommendation......e78
220.127.116.11 Enoxaparin: Recommendations......e79
18.104.22.168 Bivalirudin and Argatroban: Recommendations......e80
22.214.171.124 Fondaparinux: Recommendation......e80
5.7.5 No-Reflow Pharmacological Therapies: Recommendation......e80
5.8 PCI in Specific Anatomic Situations......e81
5.8.1 CTOs: Recommendation......e81
5.8.2 SVGs: Recommendations......e81
5.8.3 Bifurcation Lesions: Recommendations......e81
5.8.4 Aorto-Ostial Stenoses: Recommendations......e82
5.8.5 Calcified Lesions: Recommendation......e82
5.9 PCI in Specific Patient Populations......e82
5.9.4 CKD: Recommendation......e83
5.9.5 Cardiac Allografts......e83
5.10 Periprocedural MI Assessment: Recommendations......e83
5.11 Vascular Closure Devices: Recommendations......e84
6. Postprocedural Considerations......e84
6.1 Postprocedural Antiplatelet Therapy: Recommendations......e84
6.1.1 PPIs and Antiplatelet Therapy: Recommendations......e86
6.1.2 Clopidogrel Genetic Testing: Recommendations......e86
6.1.3 Platelet Function Testing: Recommendations......e86
6.2 Stent Thrombosis......e87
6.3 Restenosis: Recommendations......e87
6.3.1 Background and Incidence......e87
6.3.2 Restenosis After Balloon Angioplasty......e88
6.3.3 Restenosis After BMS......e88
6.3.4 Restenosis After DES......e88
6.4 Clinical Follow-Up......e88
6.4.1 Exercise Testing: Recommendations......e88
6.4.2 Activity and Return to Work......e89
6.4.3 Cardiac Rehabilitation: Recommendation......e89
6.5 Secondary Prevention......e89
7. Quality and Performance Considerations......e90
7.1 Quality and Performance: Recommendations......e90
7.3 Certification and Maintenance of Certification: Recommendation......e90
7.4 Operator and Institutional Competency and Volume: Recommendations......e90
7.5 Participation in ACC NCDR or National Quality Database......e91
8. Future Challenges......e91
Appendix 1. Author Relationships With Industry and Other Entities (Relevant)......e115
Appendix 2. Reviewer Relationships With Industry and Other Entities (Relevant)......e117
Appendix 3. Abbreviation List......e119
Appendix 4. Additional Tables/Figures......e120
The medical profession should play a central role in evaluating the evidence related to drugs, devices, and procedures for the detection, management, and prevention of disease. When properly applied, expert analysis of available data on the benefits and risks of these therapies and procedures can improve the quality of care, optimize patient outcomes, and favorably affect costs by focusing resources on the most effective strategies. An organized and directed approach to a thorough review of evidence has resulted in the production of clinical practice guidelines that assist physicians in selecting the best management strategy for an individual patient. Moreover, clinical practice guidelines can provide a foundation for other applications, such as performance measures, appropriate use criteria, and both quality improvement and clinical decision support tools.
The American College of Cardiology Foundation (ACCF) and the American Heart Association (AHA) have jointly produced guidelines in the area of cardiovascular disease since 1980. The ACCF/AHA Task Force on Practice Guidelines (Task Force), charged with developing, updating, and revising practice guidelines for cardiovascular diseases and procedures, directs and oversees this effort. Writing committees are charged with regularly reviewing and evaluating all available evidence to develop balanced, patient-centric recommendations for clinical practice.
Experts in the subject under consideration are selected by the ACCF and AHA to examine subject-specific data and write guidelines in partnership with representatives from other medical organizations and specialty groups. Writing committees are asked to perform a formal literature review; weigh the strength of evidence for or against particular tests, treatments, or procedures; and include estimates of expected outcomes where such data exist. Patient-specific modifiers, comorbidities, and issues of patient preference that may influence the choice of tests or therapies are considered. When available, information from studies on cost is considered, but data on efficacy and outcomes constitute the primary basis for the recommendations contained herein.
In analyzing the data and developing recommendations and supporting text, the writing committee uses evidence-based methodologies developed by the Task Force (1). The Class of Recommendation (COR) is an estimate of the size of the treatment effect considering risks versus benefits in addition to evidence and/or agreement that a given treatment or procedure is or is not useful/effective or in some situations may cause harm. The Level of Evidence (LOE) is an estimate of the certainty or precision of the treatment effect. The writing committee reviews and ranks evidence supporting each recommendation with the weight of evidence ranked as LOE A, B, or C according to specific definitions that are included in Table 1. Studies are identified as observational, retrospective, prospective, or randomized where appropriate. For certain conditions for which inadequate data are available, recommendations are based on expert consensus and clinical experience and are ranked as LOE C. When recommendations at LOE C are supported by historical clinical data, appropriate references (including clinical reviews) are cited if available. For issues for which sparse data are available, a survey of current practice among the clinicians on the writing committee is the basis for LOE C recommendations and no references are cited. The schema for COR and LOE is summarized in Table 1, which also provides suggested phrases for writing recommendations within each COR. A new addition to this methodology is separation of the Class III recommendations to delineate if the recommendation is determined to be of “no benefit” or is associated with “harm” to the patient. In addition, in view of the increasing number of comparative effectiveness studies, comparator verbs and suggested phrases for writing recommendations for the comparative effectiveness of one treatment or strategy versus another have been added for COR I and IIa, LOE A or B only.
In view of the advances in medical therapy across the spectrum of cardiovascular diseases, the Task Force has designated the term guideline-directed medical therapy (GDMT) to represent optimal medical therapy as defined by ACCF/AHA guideline recommended therapies (primarily Class I). This new term, GDMT, will be used herein and throughout all future guidelines.
Because the ACCF/AHA practice guidelines address patient populations (and healthcare providers) residing in North America, drugs that are not currently available in North America are discussed in the text without a specific COR. For studies performed in large numbers of subjects outside North America, each writing committee reviews the potential influence of different practice patterns and patient populations on the treatment effect and relevance to the ACCF/AHA target population to determine whether the findings should inform a specific recommendation.
The ACCF/AHA practice guidelines are intended to assist healthcare providers in clinical decision making by describing a range of generally acceptable approaches to the diagnosis, management, and prevention of specific diseases or conditions. The guidelines attempt to define practices that meet the needs of most patients in most circumstances. The ultimate judgment regarding care of a particular patient must be made by the healthcare provider and patient in light of all the circumstances presented by that patient. As a result, situations may arise for which deviations from these guidelines may be appropriate. Clinical decision making should involve consideration of the quality and availability of expertise in the area where care is provided. When these guidelines are used as the basis for regulatory or payer decisions, the goal should be improvement in quality of care. The Task Force recognizes that situations arise in which additional data are needed to inform patient care more effectively; these areas will be identified within each respective guideline when appropriate.
Prescribed courses of treatment in accordance with these recommendations are effective only if followed. Because lack of patient understanding and adherence may adversely affect outcomes, physicians and other healthcare providers should make every effort to engage the patient's active participation in prescribed medical regimens and lifestyles. In addition, patients should be informed of the risks, benefits, and alternatives to a particular treatment and be involved in shared decision making whenever feasible, particularly for COR IIa and IIb, where the benefit-to-risk ratio may be lower.
The Task Force makes every effort to avoid actual, potential, or perceived conflicts of interest that may arise as a result of industry relationships or personal interests among the members of the writing committee. All writing committee members and peer reviewers of the guideline are asked to disclose all such current relationships, as well as those existing 12 months previously. In December 2009, the ACCF and AHA implemented a new policy for relationships with industry and other entities (RWI) that requires the writing committee chair plus a minimum of 50% of the writing committee to have no relevant RWI (Appendix 1 for the ACCF/AHA definition of relevance). These statements are reviewed by the Task Force and all members during each conference call and/or meeting of the writing committee and are updated as changes occur. All guideline recommendations require a confidential vote by the writing committee and must be approved by a consensus of the voting members. Members are not permitted to write, and must recuse themselves from voting on, any recommendation or section to which their RWI apply. Members who recused themselves from voting are indicated in the list of writing committee members, and section recusals are noted in Appendix 1. Authors' and peer reviewers' RWI pertinent to this guideline are disclosed in Appendixes 1 and 2, respectively. Additionally, to ensure complete transparency, writing committee members' comprehensive disclosure information—including RWI not pertinent to this document—is available as an online supplement. Comprehensive disclosure information for the Task Force is also available online at www.cardiosource.org/ACC/About-ACC/Leadership/Guidelines-and-Documents-Task-Forces.aspx. The work of the writing committee was supported exclusively by the ACCF, AHA, and the Society for Cardiovascular Angiography and Interventions (SCAI) without commercial support. Writing committee members volunteered their time for this activity.
In an effort to maintain relevance at the point of care for practicing physicians, the Task Force continues to oversee an ongoing process improvement initiative. As a result, in response to pilot projects, several changes to these guidelines will be apparent, including limited narrative text, a focus on summary and evidence tables (with references linked to abstracts in PubMed) and more liberal use of summary recommendation tables (with references that support LOE) to serve as a quick reference.
In April 2011, the Institute of Medicine released 2 reports: Finding What Works in Health Care: Standards for Systematic Reviews and Clinical Practice Guidelines We Can Trust (2,3). It is noteworthy that the ACCF/AHA guidelines were cited as being compliant with many of the standards that were proposed. A thorough review of these reports and of our current methodology is under way, with further enhancements anticipated.
The recommendations in this guideline are considered current until they are superseded by a focused update or the full-text guideline is revised. Guidelines are official policy of both the ACCF and AHA.
Alice K. Jacobs, MD, FACC, FAHA, Chair ACCF/AHA Task Force on Practice Guidelines
1.1 Methodology and Evidence Review
The recommendations listed in this document are, whenever possible, evidence based. An extensive evidence review was conducted through November 2010, as well as selected other references through August 2011. Searches were limited to studies, reviews, and other evidence conducted in human subjects and that were published in English. Key search words included but were not limited to the following: ad hoc angioplasty, angioplasty, balloon angioplasty, clinical trial, coronary stenting, delayed angioplasty, meta-analysis, percutaneous transluminal coronary angioplasty, randomized controlled trial (RCT), percutaneous coronary intervention (PCI) and angina, angina reduction, antiplatelet therapy, bare-metal stents (BMS), cardiac rehabilitation, chronic stable angina, complication, coronary bifurcation lesion, coronary calcified lesion, coronary chronic total occlusion (CTO), coronary ostial lesions, coronary stent (BMS and drug-eluting stents [DES]; and BMS versus DES), diabetes, distal embolization, distal protection, elderly, ethics, late stent thrombosis, medical therapy, microembolization, mortality, multiple lesions, multivessel, myocardial infarction (MI), non–ST-elevation myocardial infarction (NSTEMI), no-reflow, optical coherence tomography, proton pump inhibitor (PPI), return to work, same-day angioplasty and/or stenting, slow flow, stable ischemic heart disease (SIHD), staged angioplasty, STEMI, survival, and unstable angina (UA). Additional searches cross-referenced these topics with the following subtopics: anticoagulant therapy, contrast nephropathy, PCI-related vascular complications, unprotected left main PCI, multivessel coronary artery disease (CAD), adjunctive percutaneous interventional devices, percutaneous hemodynamic support devices, and secondary prevention. Additionally, the committee reviewed documents related to the subject matter previously published by the ACCF and AHA. References selected and published in this document are representative and not all-inclusive.
To provide clinicians with a comprehensive set of data, whenever deemed appropriate or when published, the absolute risk difference and number needed to treat or harm will be provided in the guideline, along with confidence intervals (CIs) and data related to the relative treatment effects such as odds ratio (OR), relative risk, hazard ratio (HR), or incidence rate ratio.
The focus of this guideline is the safe, appropriate, and efficacious performance of PCI. The risks of PCI must be balanced against the likelihood of improved survival, symptoms, or functional status. This is especially important in patients with SIHD.
1.2 Organization of the Writing Committee
The committee was composed of physicians with expertise in interventional cardiology, general cardiology, critical care cardiology, cardiothoracic surgery, clinical trials, and health services research. The committee included representatives from the ACCF, AHA, and SCAI.
1.3 Document Review and Approval
This document was reviewed by 2 official reviewers nominated by the ACCF, AHA, and SCAI, as well as 21 individual content reviewers (including members of the ACCF Interventional Scientific Council and ACCF Surgeons' Scientific Council). All information on reviewers' RWI was distributed to the writing committee and is published in this document (Appendix 2). This document was approved for publication by the governing bodies of the ACCF, AHA, and SCAI.
1.4 PCI Guidelines: History and Evolution
In 1982, a 2-page manuscript titled “Guidelines for the Performance of Percutaneous Transluminal Coronary Angioplasty” was published in Circulation (4). The document, which addressed the specific expertise and experience physicians should have to perform balloon angioplasty, as well as laboratory requirements and the need for surgical support, was written by an ad hoc group whose members included Andreas Grüntzig. In 1980, the ACC and the AHA established the Task Force on Assessment of Diagnostic and Therapeutic Cardiovascular Procedures, which was charged with the development of guidelines related to the role of new therapeutic approaches and of specific noninvasive and invasive procedures in the diagnosis and management of cardiovascular disease. The first ACC/AHA Task Force report on guidelines for coronary balloon angioplasty was published in 1988 (5). The 18-page document discussed and made recommendations about lesion classification and success rates, indications for and contraindications to balloon angioplasty, institutional review of angioplasty procedures, ad hoc angioplasty after angiography, and on-site surgical backup. Further iterations of the guidelines were published in 1993 (6), 2001 (7), and 2005 (8). In 2007 and 2009, focused updates to the guideline were published to expeditiously address new study results and recent changes in the field of interventional cardiology (9,10). The 2009 focused update is notable in that there was direct collaboration between the writing committees for the STEMI guidelines and the PCI guidelines, resulting in a single publication of focused updates on STEMI and PCI (10).
The evolution of the PCI guideline reflects the growth of knowledge in the field and parallels the many advances and innovations in the field of interventional cardiology, including primary PCI, BMS and DES, intravascular ultrasound (IVUS) and physiologic assessments of stenosis, and newer antiplatelet and anticoagulant therapies. The 2011 iteration of the guideline continues this process, addressing ethical aspects of PCI, vascular access considerations, CAD revascularization including hybrid revascularization, revascularization before noncardiac surgery, optical coherence tomography, advanced hemodynamic support devices, no-reflow therapies, and vascular closure devices. Most of this document is organized according to “patient flow,” consisting of preprocedural considerations, procedural considerations, and postprocedural considerations. In a major undertaking, the STEMI, PCI, and coronary artery bypass graft (CABG) surgery guidelines were written concurrently, with additional collaboration with the SIHD guideline writing committee, allowing greater collaboration between the different writing committees on topics such as PCI in STEMI and revascularization strategies in patients with CAD (including unprotected left main PCI, multivessel disease revascularization, and hybrid procedures).
In accordance with direction from the Task Force and feedback from readers, in this iteration of the guideline, the text has been shortened, with an emphasis on summary statements rather than detailed discussion of numerous individual trials. Online supplemental evidence and summary tables have been created to document the studies and data considered for new or changed guideline recommendations.
2 CAD Revascularization
Recommendations and text in this section are the result of extensive collaborative discussions between the PCI and CABG writing committees, as well as key members of the SIHD and UA/NSTEMI writing committees. Certain issues, such as older versus more contemporary studies, primary analyses versus subgroup analyses, and prospective versus post hoc analyses, have been carefully weighed in designating COR and LOE; they are addressed in the appropriate corresponding text. The goals of revascularization for patients with CAD are to 1) improve survival and/or 2) relieve symptoms.
Revascularization recommendations in this section are predominantly based on studies of patients with symptomatic SIHD and should be interpreted in this context. As discussed later in this section, recommendations on the type of revascularization are, in general, applicable to patients with UA/NSTEMI. In some cases (e.g., unprotected left main CAD), specific recommendations are made for patients with UA/NSTEMI or STEMI.
Historically, most studies of revascularization have been based on and reported according to angiographic criteria. Most studies have defined a “significant” stenosis as ≥70% diameter narrowing; therefore, for revascularization decisions and recommendations in this section, a “significant” stenosis has been defined as ≥70% diameter narrowing (≥50% for left main CAD). Physiological criteria, such as an assessment of fractional flow reserve (FFR), has been used in deciding when revascularization is indicated. Thus, for recommendations about revascularization in this section, coronary stenoses with FFR ≤0.80 can also be considered to be “significant” (11,12).
As noted, the revascularization recommendations have been formulated to address issues related to 1) improved survival and/or 2) improved symptoms. When one method of revascularization is preferred over the other for improved survival, this consideration, in general, takes precedence over improved symptoms. When discussing options for revascularization with the patient, he or she should understand when the procedure is being performed in an attempt to improve symptoms, survival, or both.
Although some results from the SYNTAX (Synergy between Percutaneous Coronary Intervention with TAXUS and Cardiac Surgery) study are best characterized as subgroup analyses and “hypothesis generating,” SYNTAX nonetheless represents the latest and most comprehensive comparison of PCI and CABG (13,14). Therefore, the results of SYNTAX have been considered appropriately when formulating our revascularization recommendations. Although the limitations of using the SYNTAX score for certain revascularization recommendations are recognized, the SYNTAX score is a reasonable surrogate for the extent of CAD and its complexity and serves as important information that should be considered when making revascularization decisions. Recommendations that refer to SYNTAX scores use them as surrogates for the extent and complexity of CAD.
Revascularization recommendations to improve survival and symptoms are provided in the following text and are summarized in Tables 2 and 3.⇓⇓ References to studies comparing revascularization with medical therapy are presented when available for each anatomic subgroup.SeeOnline Data Supplements 1 and 2for additional data regarding the survival and symptomatic benefits with CABG or PCI for different anatomic subsets.
2.1 Heart Team Approach to Revascularization Decisions: Recommendations
1. A Heart Team approach to revascularization is recommended in patients with unprotected left main or complex CAD (14–16). (Level of Evidence: C)
1. Calculation of the Society of Thoracic Surgeons (STS) and SYNTAX scores is reasonable in patients with unprotected left main and complex CAD (13,14,17–22). (Level of Evidence: B)
One protocol used in RCTs (14–16,23) often involves a multidisciplinary approach referred to as the Heart Team. Composed of an interventional cardiologist and a cardiac surgeon, the Heart Team 1) reviews the patient's medical condition and coronary anatomy, 2) determines that PCI and/or CABG are technically feasible and reasonable, and 3) discusses revascularization options with the patient before a treatment strategy is selected. Support for using a Heart Team approach comes from reports that patients with complex CAD referred specifically for PCI or CABG in concurrent trial registries have lower mortality rates than those randomly assigned to PCI or CABG in controlled trials (15,16).
The SIHD, PCI, and CABG guideline writing committees endorse a Heart Team approach in patients with unprotected left main CAD and/or complex CAD in whom the optimal revascularization strategy is not straightforward. A collaborative assessment of revascularization options, or the decision to treat with GDMT without revascularization, involving an interventional cardiologist, a cardiac surgeon, and (often) the patient's general cardiologist, followed by discussion with the patient about treatment options, is optimal. Particularly in patients with SIHD and unprotected left main and/or complex CAD for whom a revascularization strategy is not straightforward, an approach has been endorsed that involves terminating the procedure after diagnostic coronary angiography is completed: this allows a thorough discussion and affords both the interventional cardiologist and cardiac surgeon the opportunity to discuss revascularization options with the patient. Because the STS score and the SYNTAX score have been shown to predict adverse outcomes in patients undergoing CABG and PCI, respectively, calculation of these scores is often useful in making revascularization decisions (13,14,17–22).
2.2 Revascularization to Improve Survival: Recommendations
Left Main CAD Revascularization
1. CABG to improve survival is recommended for patients with significant (≥50% diameter stenosis) left main coronary artery stenosis (24–30). (Level of Evidence: B)
1. PCI to improve survival is reasonable as an alternative to CABG in selected stable patients with significant (≥50% diameter stenosis) unprotected left main CAD with: 1) anatomic conditions associated with a low risk of PCI procedural complications and a high likelihood of good long-term outcome (e.g., a low SYNTAX score [≤22], ostial or trunk left main CAD); and 2) clinical characteristics that predict a significantly increased risk of adverse surgical outcomes (e.g., STS-predicted risk of operative mortality ≥5%) (13,17,19,23,31–48). (Level of Evidence: B)
2. PCI to improve survival is reasonable in patients with UA/NSTEMI when an unprotected left main coronary artery is the culprit lesion and the patient is not a candidate for CABG (13,36–39,44,45,47–49). (Level of Evidence: B)
3. PCI to improve survival is reasonable in patients with acute STEMI when an unprotected left main coronary artery is the culprit lesion, distal coronary flow is less than TIMI (Thrombolysis In Myocardial Infarction) grade 3, and PCI can be performed more rapidly and safely than CABG (33,50,51). (Level of Evidence: C)
1. PCI to improve survival may be reasonable as an alternative to CABG in selected stable patients with significant (≥50% diameter stenosis) unprotected left main CAD with: 1) anatomic conditions associated with a low to intermediate risk of PCI procedural complications and an intermediate to high likelihood of good long-term outcome (e.g., low-intermediate SYNTAX score of <33, bifurcation left main CAD); and 2) clinical characteristics that predict an increased risk of adverse surgical outcomes (e.g., moderate-severe chronic obstructive pulmonary disease, disability from previous stroke, or previous cardiac surgery; STS-predicted risk of operative mortality >2%) (13,17,19,23,31–48,52). (Level of Evidence: B)
CLASS III: HARM
1. PCI to improve survival should not be performed in stable patients with significant (≥50% diameter stenosis) unprotected left main CAD who have unfavorable anatomy for PCI and who are good candidates for CABG (13,17,19,24–32). (Level of Evidence: B)
Non–Left Main CAD Revascularization
1. CABG to improve survival is beneficial in patients with significant (≥70% diameter) stenoses in 3 major coronary arteries (with or without involvement of the proximal left anterior descending [LAD] artery) or in the proximal LAD plus 1 other major coronary artery (26,30,53–56). (Level of Evidence: B)
2. CABG or PCI to improve survival is beneficial in survivors of sudden cardiac death with presumed ischemia-mediated ventricular tachycardia caused by significant (≥70% diameter) stenosis in a major coronary artery. (CABG Level of Evidence: B [57–59]; PCI Level of Evidence: C )
1. CABG to improve survival is reasonable in patients with significant (≥70% diameter) stenoses in 2 major coronary arteries with severe or extensive myocardial ischemia (e.g., high-risk criteria on stress testing, abnormal intracoronary hemodynamic evaluation, or >20% perfusion defect by myocardial perfusion stress imaging) or target vessels supplying a large area of viable myocardium (60–63). (Level of Evidence: B)
2. CABG to improve survival is reasonable in patients with mild-moderate left ventricular (LV) systolic dysfunction (ejection fraction [EF] 35% to 50%) and significant (≥70% diameter stenosis) multivessel CAD or proximal LAD coronary artery stenosis, when viable myocardium is present in the region of intended revascularization (30,64–68). (Level of Evidence: B)
3. CABG with a left internal mammary artery (LIMA) graft to improve survival is reasonable in patients with significant (≥70% diameter) stenosis in the proximal LAD artery and evidence of extensive ischemia (30,56,69,70). (Level of Evidence: B)
4. It is reasonable to choose CABG over PCI to improve survival in patients with complex 3-vessel CAD (e.g., SYNTAX score >22), with or without involvement of the proximal LAD artery who are good candidates for CABG (32,46,56,71,72). (Level of Evidence: B)
5. CABG is probably recommended in preference to PCI to improve survival in patients with multivessel CAD and diabetes mellitus, particularly if a LIMA graft can be anastomosed to the LAD artery (62,74–81). (Level of Evidence: B)
1. The usefulness of CABG to improve survival is uncertain in patients with significant (≥70%) diameter stenoses in 2 major coronary arteries not involving the proximal LAD artery and without extensive ischemia (56). (Level of Evidence: C)
2. The usefulness of PCI to improve survival is uncertain in patients with 2- or 3-vessel CAD (with or without involvement of the proximal LAD artery) or 1-vessel proximal LAD disease (26,53,56,82). (Level of Evidence: B)
3. CABG might be considered with the primary or sole intent of improving survival in patients with SIHD with severe LV systolic dysfunction (EF <35%) whether or not viable myocardium is present (30,64–68,83,84). (Level of Evidence: B)
4. The usefulness of CABG or PCI to improve survival is uncertain in patients with previous CABG and extensive anterior wall ischemia on noninvasive testing (85–93). (Level of Evidence: B)
CLASS III: HARM
1. CABG or PCI should not be performed with the primary or sole intent to improve survival in patients with SIHD with 1 or more coronary stenoses that are not anatomically or functionally significant (e.g., <70% diameter non–left main coronary artery stenosis, FFR >0.80, no or only mild ischemia on noninvasive testing), involve only the left circumflex or right coronary artery, or subtend only a small area of viable myocardium (30,53,60,61,94–98). (Level of Evidence: B)
2.3 Revascularization to Improve Symptoms: Recommendations
1. CABG or PCI to improve symptoms is beneficial in patients with 1 or more significant (≥70% diameter) coronary artery stenoses amenable to revascularization and unacceptable angina despite GDMT (82,99–108). (Level of Evidence: A)
1. CABG or PCI to improve symptoms is reasonable in patients with 1 or more significant (≥70% diameter) coronary artery stenoses and unacceptable angina for whom GDMT cannot be implemented because of medication contraindications, adverse effects, or patient preferences. (Level of Evidence: C)
2. PCI to improve symptoms is reasonable in patients with previous CABG, 1 or more significant (≥70% diameter) coronary artery stenoses associated with ischemia, and unacceptable angina despite GDMT (86,89,92). (Level of Evidence: C)
3. It is reasonable to choose CABG over PCI to improve symptoms in patients with complex 3-vessel CAD (e.g., SYNTAX score >22), with or without involvement of the proximal LAD artery who are good candidates for CABG (32,46,56,72,73). (Level of Evidence: B)
1. CABG to improve symptoms might be reasonable for patients with previous CABG, 1 or more significant (≥70% diameter) coronary artery stenoses not amenable to PCI, and unacceptable angina despite GDMT (93). (Level of Evidence: C)
2. Transmyocardial laser revascularization (TMR) performed as an adjunct to CABG to improve symptoms may be reasonable in patients with viable ischemic myocardium that is perfused by arteries that are not amenable to grafting (109–113). (Level of Evidence: B)
CLASS III: HARM
1. CABG or PCI to improve symptoms should not be performed in patients who do not meet anatomic (≥50% diameter left main or ≥70% non–left main stenosis diameter) or physiological (e.g., abnormal FFR) criteria for revascularization. (Level of Evidence: C)
2.4 CABG Versus Contemporaneous Medical Therapy
In the 1970s and 1980s, 3 RCTs established the survival benefit of CABG compared with contemporaneous (although minimal by current standards) medical therapy without revascularization in certain subjects with stable angina: the Veterans Affairs Cooperative Study (114), European Coronary Surgery Study (55), and CASS (Coronary Artery Surgery Study) (115). Subsequently, a 1994 meta-analysis of 7 studies that randomized a total of 2,649 patients to medical therapy or CABG (30) showed that CABG offered a survival advantage over medical therapy for patients with left main or 3-vessel CAD. The studies also established that CABG is more effective than medical therapy for relieving anginal symptoms. These studies have been replicated only once during the past decade. In MASS II (Medicine, Angioplasty, or Surgery Study II), patients with multivessel CAD who were treated with CABG were less likely than those treated with medical therapy to have a subsequent MI, need additional revascularization, or experience cardiac death in the 10 years after randomization (104).
Surgical techniques and medical therapy have improved substantially during the intervening years. As a result, if CABG were to be compared with GDMT in RCTs today, the relative benefits for survival and angina relief observed several decades ago might no longer be observed. Conversely, the concurrent administration of GDMT may substantially improve long-term outcomes in patients treated with CABG in comparison with those receiving medical therapy alone. In the BARI 2D (Bypass Angioplasty Revascularization Investigation 2 Diabetes) trial of patients with diabetes mellitus, no significant difference in risk of mortality in the cohort of patients randomized to GDMT plus CABG or GDMT alone was observed, although the study was not powered for this endpoint, excluded patients with significant left main CAD, and included only a small percentage of patients with proximal LAD artery disease or LV ejection fraction (LVEF) <0.50 (116). The PCI and CABG guideline writing committees endorse the performance of the ISCHEMIA (International Study of Comparative Health Effectiveness with Medical and Invasive Approaches) trial, which will provide contemporary data on the optimal management strategy (medical therapy or revascularization with CABG or PCI) of patients with SIHD, including multivessel CAD, and moderate to severe ischemia.
2.5 PCI Versus Medical Therapy
Although contemporary interventional treatments have lowered the risk of restenosis compared with earlier techniques, meta-analyses have failed to show that the introduction of BMS confers a survival advantage over balloon angioplasty (117–119) or that the use of DES confers a survival advantage over BMS (119,120).
No study to date has demonstrated that PCI in patients with SIHD improves survival rates (26,53,56,82,116,119,121–124). Neither COURAGE (Clinical Outcomes Utilizing Revascularization and Aggressive Drug Evaluation) (82) nor BARI 2D (116), which treated all patients with contemporary optimal medical therapy, demonstrated any survival advantage with PCI, although these trials were not specifically powered for this endpoint. Although 1 large analysis evaluating 17 RCTs of PCI versus medical therapy (including 5 trials of subjects with acute coronary syndromes [ACS]) found a 20% reduction in death with PCI compared with medical therapy (123), 2 other large analyses did not (119,122). An evaluation of 13 studies reporting the data from 5,442 patients with nonacute CAD showed no advantage of PCI over medical therapy for the individual endpoints of all-cause death, cardiac death or MI, or nonfatal MI (124). Evaluation of 61 trials of PCI conducted over several decades shows that despite improvements in PCI technology and pharmacotherapy, PCI has not been demonstrated to reduce the risk of death or MI in patients without recent ACS (119).
The findings from individual studies and systematic reviews of PCI versus medical therapy can be summarized as follows:
2.6 CABG Versus PCI
The results of 26 RCTs comparing CABG and PCI have been published: Of these, 9 compared CABG with balloon angioplasty (75,105,128–142), 14 compared CABG with BMS implantation (88,143–160), and 3 compared CABG with DES implantation (14,161,162).
2.6.1 CABG Versus Balloon Angioplasty or BMS
A systematic review of the 22 RCTs comparing CABG with balloon angioplasty or BMS implantation concluded the following (163):
1. Survival was similar for CABG and PCI (with balloon angioplasty or BMS) at 1 year and 5 years. Survival was similar for CABG and PCI in subjects with 1-vessel CAD (including those with disease of the proximal portion of the LAD artery) or multivessel CAD.
2. Incidence of MI was similar at 5 years after randomization.
3. Procedural stroke occurred more commonly with CABG than with PCI (1.2% versus 0.6%).
4. Relief of angina was accomplished more effectively with CABG than with PCI 1 year after randomization and 5 years after randomization.
5. During the first year after randomization, repeat coronary revascularization was performed less often after CABG than after PCI (3.8% versus 26.5%). This was also demonstrated after 5 years of follow-up (9.8% versus 46.1%). This difference was more pronounced with balloon angioplasty than with BMS.
A collaborative analysis of data from 10 RCTs comparing CABG with balloon angioplasty (6 trials) or with BMS implantation (4 trials) (164) permitted subgroup analyses of the data from the 7,812 patients. No difference was noted with regard to mortality rate 5.9 years after randomization or the composite endpoint of death or MI. Repeat revascularization and angina were noted more frequently in those treated with balloon angioplasty or BMS implantation (164). The major new observation of this analysis was that CABG was associated with better outcomes in patients with diabetes mellitus and in those >65 years old. Of interest, the relative outcomes of CABG and PCI were not influenced by other patient characteristics, including the number of diseased coronary arteries.
The aforementioned meta-analysis and systematic review (163,164) comparing CABG and balloon angioplasty or BMS implantation were limited in several ways:
1. Many trials did not report outcomes for other important patient subsets. For example, the available data are insufficient to determine if race, obesity, renal dysfunction, peripheral arterial disease, or previous coronary revascularization affected the comparative outcomes of CABG and PCI.
2. Most of the patients enrolled in these trials were male, and most had 1- or 2-vessel CAD and normal LV systolic function (EF >50%)—subjects known to be unlikely to derive a survival benefit and less likely to experience complications after CABG (30).
3. The patients enrolled in these trials represented only a small fraction (generally <5% to 10%) of those who were screened. For example, most screened patients with 1-vessel CAD and many with 3-vessel CAD were not considered for randomization.
SeeOnline Data Supplements 3 and 4for additional data comparing CABG with PCI.
2.6.2 CABG Versus DES
Although the results of 9 observational studies comparing CABG and DES implantation have been published (32,165–172), most of them had short (12 to 24 months) follow-up periods. In a meta-analysis of 24,268 patients with multivessel CAD treated with CABG or DES (173), the incidences of death and MI were similar for the 2 procedures, but the frequency with which repeat revascularization was performed was roughly 4 times higher after DES implantation. Only 1 large RCT comparing CABG and DES implantation has been published. The SYNTAX trial randomly assigned 1,800 patients (of a total of 4,337 who were screened) to receive DES or CABG (14,46). Major adverse cardiac events (MACE), a composite of death, stroke, MI, or repeat revascularization during the 3 years after randomization, occurred in 20.2% of CABG patients and 28.0% of those undergoing DES implantation (p<0.001). The rates of death and stroke were similar; however, MI (3.6% for CABG, 7.1% for DES) and repeat revascularization (10.7% for CABG, 19.7% for DES) were more likely to occur with DES implantation (46).
In SYNTAX, the extent of CAD was assessed using the SYNTAX score, which is based on the location, severity, and extent of coronary stenoses, with a low score indicating less complicated anatomic CAD. In post hoc analyses, a low score was defined as ≤22; intermediate, 23 to 32; and high, ≥33. The occurrence of MACE correlated with the SYNTAX score for DES patients but not for those undergoing CABG. At 12-month follow-up, the primary endpoint was similar for CABG and DES in those with a low SYNTAX score. In contrast, MACE occurred more often after DES implantation than after CABG in those with an intermediate or high SYNTAX score (14). At 3 years of follow-up, the mortality rate was greater in subjects with 3-vessel CAD treated with PCI than in those treated with CABG (6.2% versus 2.9%). The differences in MACE between those treated with PCI or CABG increased with an increasing SYNTAX score (Figure 1) (46).
Although the utility of using a SYNTAX score in everyday clinical practice remains uncertain, it seems reasonable to conclude from SYNTAX and other data that outcomes of patients undergoing PCI or CABG in those with relatively uncomplicated and lesser degrees of CAD are comparable, whereas in those with complex and diffuse CAD, CABG appears to be preferable (46).
SeeOnline Data Supplements 5 and 6for additional data comparing CABG with DES.
2.7 Left Main CAD
2.7.1 CABG or PCI Versus Medical Therapy for Left Main CAD
CABG confers a survival benefit over medical therapy in patients with left main CAD. Subgroup analyses from RCTs performed 3 decades ago included 91 patients with left main CAD in the Veterans Administration Cooperative Study (28). A meta-analysis of these trials demonstrated a 66% reduction in relative risk in mortality with CABG, with the benefit extending to 10 years (30). The CASS Registry (24) contained data from 1,484 patients with ≥50% diameter stenosis left main CAD initially treated surgically or nonsurgically. Median survival duration was 13.3 years in the surgical group; and 6.6 years in the medical group. The survival benefit of CABG over medical therapy appeared to extend to 53 asymptomatic patients with left main CAD in the CASS Registry (29). Other therapies that subsequently have been shown to be associated with improved long-term outcome, such as the use of aspirin, statins, and internal mammary artery grafting, were not widely used in that era.
RCTs and subgroup analyses that compare PCI with medical therapy in patients with “unprotected” left main CAD do not exist.
2.7.2 Studies Comparing PCI Versus CABG for Left Main CAD
Of all subjects undergoing coronary angiography, approximately 4% are found to have left main CAD (175), >80% of whom have significant (≥70% diameter) stenoses in other epicardial coronary arteries.
Published cohort studies have found that major clinical outcomes are similar with PCI or CABG 1 year after revascularization and that mortality rates are similar at 1, 2, and 5 years of follow-up; however, the risk of needing target-vessel revascularization is significantly higher with stenting than with CABG.
In the SYNTAX trial, 45% of screened patients with unprotected left main CAD had complex disease that prevented randomization; 89% of these underwent CABG (13,14). In addition, 705 of the 1,800 patients who were randomized had revascularization for unprotected left main CAD. The majority of patients with left main CAD and a low SYNTAX score had isolated left main CAD or left main CAD plus 1-vessel CAD; the majority of those with an intermediate score had left main CAD plus 2-vessel CAD; and most of those with a high SYNTAX score had left main CAD plus 3-vessel CAD. At 1 year, rates of all-cause death and MACE were similar for the 2 groups (13). Repeat revascularization rates were higher in the PCI group than the CABG group (11.8% versus 6.5%), but stroke occurred more often in the CABG group (2.7% versus 0.3%). At 3 years of follow-up, the incidence of death in those undergoing left main CAD revascularization with low or intermediate SYNTAX scores (≤32) was 3.7% after PCI and 9.1% after CABG (p=0.03), whereas in those with a high SYNTAX score (≥33), the incidence of death after 3 years was 13.4% after PCI and 7.6% after CABG (p=0.10) (46). Because the primary endpoint of SYNTAX was not met (i.e., noninferiority comparison of CABG and PCI), these subgroup analyses need to be considered in that context.
In the LE MANS (Study of Unprotected Left Main Stenting Versus Bypass Surgery) trial (23), 105 patients with left main CAD were randomized to receive PCI or CABG. Although a low proportion of patients treated with PCI received DES (35%) and a low proportion of patients treated with CABG received internal mammary grafts (72%), the outcomes at 30 days and 1 year were similar between the groups. In the PRECOMBAT (Premier of Randomized Comparison of Bypass Surgery versus Angioplasty Using Sirolimus-Eluting Stent in Patients with Left Main Coronary Artery Disease) trial of 600 patients with left main disease, the composite endpoint of death, MI, or stroke at 2 years occurred in 4.4% of patients treated with PCI patients and 4.7% of patients treated with CABG, but ischemia-driven target-vessel revascularization was more often required in the patients treated with PCI (9.0% versus 4.2%) (52).
The results from these 3 RCTs suggest (but do not definitively prove) that major clinical outcomes in selected patients with left main CAD are similar with CABG and PCI at 1- to 2-year follow-up, but repeat revascularization rates are higher after PCI than after CABG. RCTs with extended follow-up of ≥5 years are required to provide definitive conclusions about the optimal treatment of left main CAD. In a meta-analysis of 8 cohort studies and 2 RCTs (41), death, MI, and stroke occurred with similar frequency in the PCI- and CABG-treated patients at 1, 2, and 3 years of follow-up. Target-vessel revascularization was performed more often in the PCI group at 1 year (OR: 4.36), 2 years (OR: 4.20), and 3 years (OR: 3.30).
SeeOnline Data Supplements 7 to 12for additional data comparing PCI with CABG for left main CAD.
2.7.3 Revascularization Considerations for Left Main CAD
Although CABG has been considered the “gold standard” for unprotected left main CAD revascularization, more recently PCI has emerged as a possible alternative mode of revascularization in carefully selected patients. Lesion location is an important determinant when considering PCI for unprotected left main CAD. Stenting of the left main ostium or trunk is more straightforward than treating distal bifurcation or trifurcation stenoses, which generally requires a greater degree of operator experience and expertise (176). In addition, PCI of bifurcation disease is associated with higher restenosis rates than when disease is confined to the ostium or trunk (39,177). Although lesion location influences technical success and long-term outcomes after PCI, location exerts a negligible influence on the success of CABG. In subgroup analyses, patients with left main CAD and a SYNTAX score ≥33 with more complex or extensive CAD had a higher mortality rate with PCI than with CABG (46). Physicians can estimate operative risk for all CABG candidates using a standard instrument, such as the risk calculator from the STS database. The above considerations are important factors when choosing among revascularization strategies for unprotected left main CAD and have been factored into revascularization recommendations. Use of a Heart Team approach has been recommended in cases in which the choice of revascularization is not straightforward. As discussed in Section 2.9.7, the ability of the patient to tolerate and comply with dual antiplatelet therapy (DAPT) is also an important consideration in revascularization decisions.
The 2005 PCI guideline (8) recommended routine angiographic follow-up 2 to 6 months after stenting for unprotected left main CAD. However, because angiography has limited ability to predict stent thrombosis and the results of SYNTAX suggest good intermediate-term results for PCI in subjects with left main CAD, this recommendation was removed in the 2009 STEMI/PCI focused update (10).
Experts have recommended immediate PCI for unprotected left main CAD in the setting of STEMI (51). The impetus for such a strategy is greatest when left main CAD is the site of the culprit lesion, antegrade coronary flow is diminished (e.g., TIMI flow grade 0, 1, or 2), the patient is hemodynamically unstable, and it is believed that PCI can be performed more quickly than CABG. When possible, the interventional cardiologist and cardiac surgeon should decide together on the optimal form of revascularization for these subjects, although it is recognized that these patients are usually critically ill and therefore not amenable to a prolonged deliberation or discussion of treatment options.
2.8 Proximal LAD Artery Disease
A cohort study (53) and a meta-analysis (30) from the 1990s suggested that CABG confers a survival advantage over contemporaneous medical therapy for patients with disease in the proximal segment of the LAD artery. Cohort studies and RCTs (30,133,146,148,161,178–181) as well as collaborative- and meta-analyses (164,182–184) showed that PCI and CABG result in similar survival rates in these patients.
SeeOnline Data Supplement 13for additional data regarding proximal LAD artery revascularization.
2.9 Clinical Factors That May Influence the Choice of Revascularization
2.9.1 Diabetes Mellitus
An analysis performed in 2009 of data on 7,812 patients (1,233 with diabetes) in 10 RCTs demonstrated a worse long-term survival rate in patients with diabetes mellitus after balloon angioplasty or BMS implantation than after CABG (164). The BARI 2D trial (116) randomly assigned 2,368 patients with type 2 diabetes and CAD to undergo intensive medical therapy or prompt revascularization with PCI or CABG, according to whichever was thought to be more appropriate. By study design, those with less extensive CAD more often received PCI, whereas those with more extensive CAD were more likely to be treated with CABG. The study was not designed to compare PCI with CABG. At 5-year follow-up, no difference in rates of survival or MACE between the medical therapy group and those treated with revascularization was noted. In the PCI stratum, no significant difference in MACE between medical therapy and revascularization was demonstrated (DES in 35%; BMS in 56%); in the CABG stratum, MACE occurred less often in the revascularization group. One-year follow-up data from the SYNTAX study demonstrated a higher rate of repeat revascularization in patients with diabetes mellitus treated with PCI than with CABG, driven by a tendency for higher repeat revascularization rates in those with higher SYNTAX scores undergoing PCI (76). In summary, in subjects requiring revascularization for multivessel CAD, current evidence supports diabetes mellitus as an important factor when deciding on a revascularization strategy, particularly when complex or extensive CAD is present (Figure 2).
SeeOnline Data Supplements 14 and 15for additional data regarding diabetes mellitus.
2.9.2 Chronic Kidney Disease
Cardiovascular morbidity and mortality rates are markedly increased in patients with chronic kidney disease (CKD) when compared with age-matched controls without CKD. The mortality rate for patients on hemodialysis is >20% per year, and approximately 50% of deaths among these patients are due to a cardiovascular cause (187,188).
To date, randomized comparisons of coronary revascularization (with CABG or PCI) and medical therapy in patients with CKD have not been reported. Some, but not all, observational studies or subgroup analyses have demonstrated an improved survival rate with revascularization compared with medical therapy in patients with CKD and multivessel CAD (189–191), despite the fact that the incidence of periprocedural complications (e.g., death, MI, stroke, infection, renal failure) is increased in patients with CKD compared with those without renal dysfunction. Some studies have shown that CABG is associated with a greater survival benefit than PCI among patients with severe renal dysfunction (190–196).
2.9.3 Completeness of Revascularization
Most patients undergoing CABG receive complete or nearly complete revascularization, which seems to influence long-term prognosis positively (197). In contrast, complete revascularization is accomplished less often in subjects receiving PCI (e.g., in <70% of patients), but the extent to which the absence of complete initial revascularization influences outcome is less clear. Rates of late survival and survival free of MI appears to be similar in patients with and without complete revascularization after PCI. Nevertheless, the need for subsequent CABG is usually higher in those whose initial revascularization procedure was incomplete (compared with those with complete revascularization) after PCI (198–200).
2.9.4 LV Systolic Dysfunction
Several older studies and a meta-analysis of the data from these studies reported that patients with LV systolic dysfunction (predominantly mild to moderate in severity) had better survival with CABG than with medical therapy alone (30,64–68). For patients with more severe LV systolic dysfunction, however, the evidence that CABG results in better survival compared with medical therapy is lacking. In the STICH (Surgical Treatment for Ischemic Heart Failure) trial of subjects with LVEF <35% with or without viability testing, CABG and GDMT resulted in similar rates of survival (death from any cause, the study's primary outcome) after 5 years of follow-up. For a number of secondary outcomes at this time point, including 1) death from any cause or hospitalization for heart failure, 2) death from any cause or hospitalization for cardiovascular causes, 3) death from any cause or hospitalization for any cause, or 4) death from any cause or revascularization with PCI or CABG, CABG was superior to GDMT. Although the primary outcome (death from any cause) was similar in the 2 treatment groups after an average of 5 years of follow-up, the data suggest the possibility that outcomes would differ if the follow-up were longer in duration; as a result, the study is being continued to provide follow-up for up to 10 years (83,84).
Only very limited data comparing PCI with medical therapy in patients with LV systolic dysfunction are available (68). In several ways, these data are suboptimal, in that many studies compared CABG with balloon angioplasty, many were retrospective, and many were based on cohort or registry data. Some of the studies demonstrated a similar survival rate in patients having CABG and PCI (71,164,201–203), whereas others showed that those undergoing CABG had better outcomes (32). The data that exist at present on revascularization in patients with CAD and LV systolic dysfunction are more robust for CABG than for PCI, although data from contemporary RCTs in this patient population are lacking. Therefore, the choice of revascularization in patients with CAD and LV systolic dysfunction is best based on clinical variables (e.g., coronary anatomy, presence of diabetes mellitus, presence of CKD), magnitude of LV systolic dysfunction, patient preferences, clinical judgment, and consultation between the interventional cardiologist and the cardiac surgeon.
2.9.5 Previous CABG
In patients with recurrent angina after CABG, repeat revascularization is most likely to improve survival in subjects at highest risk, such as those with obstruction of the proximal LAD artery and extensive anterior ischemia (85–93). Patients with ischemia in other locations and those with a patent LIMA to the LAD artery are unlikely to experience a survival benefit from repeat revascularization (92).
Cohort studies comparing PCI and CABG among post-CABG patients report similar rates of mid- and long-term survival after the 2 procedures (85,88–91,93,204). In the patient with previous CABG who is referred for revascularization for medically refractory ischemia, factors that may support the choice of repeat CABG include vessels unsuitable for PCI, number of diseased bypass grafts, availability of the internal mammary artery for grafting chronically occluded coronary arteries, and good distal targets for bypass graft placement. Factors favoring PCI over CABG include limited areas of ischemia causing symptoms, suitable PCI targets, a patent graft to the LAD artery, poor CABG targets, and comorbid conditions.
2.9.6 Unstable Angina/Non–ST-Elevation Myocardial Infarction
The main difference between management of the patient with SIHD and the patient with UA/NSTEMI is that the impetus for revascularization is stronger in the setting of UA/NSTEMI, because myocardial ischemia occurring as part of an ACS is potentially life threatening, and associated anginal symptoms are more likely to be reduced with a revascularization procedure than with GDMT (205–207). Thus, the indications for revascularization are strengthened by the acuity of presentation, the extent of ischemia, and the ability to achieve full revascularization. The choice of revascularization method is generally dictated by the same considerations used to decide on PCI or CABG for patients with SIHD.
2.9.7 DAPT Compliance and Stent Thrombosis: Recommendation
CLASS III: HARM
1. PCI with coronary stenting (BMS or DES) should not be performed if the patient is not likely to be able to tolerate and comply with DAPT for the appropriate duration of treatment based on the type of stent implanted (208–211).(Level of Evidence: B)
The risk of stent thrombosis is increased dramatically in patients who prematurely discontinue DAPT, and stent thrombosis is associated with a mortality rate of 20% to 45% (208). Because the risk of stent thrombosis with BMS is greatest in the first 14 to 30 days, this is the generally recommended minimum duration of DAPT therapy for these individuals. Consensus in clinical practice is to treat DES patients for at least 12 months with DAPT to avoid late (after 30 days) stent thrombosis (208,212). Therefore, the ability of the patient to tolerate and comply with at least 30 days of DAPT with BMS treatment and at least 12 months of DAPT with DES treatment is an important consideration in deciding whether to use PCI to treat patients with CAD.
2.10 TMR as an Adjunct to CABG
TMR has been used on occasion in patients with severe angina refractory to GDMT in whom complete revascularization cannot be achieved with PCI and/or CABG. Although the mechanism by which TMR might be efficacious in these patients is unknown (213,214), several RCTs of TMR as sole therapy demonstrated a reduction in anginal symptoms compared with intensive medical therapy alone (109–111,215–217). A single randomized multicenter comparison of TMR (with a holmium:YAG laser) plus CABG and CABG alone in patients in whom some myocardial segments were perfused by arteries considered not amenable to grafting (112) showed a significant reduction in perioperative mortality rate (1.5% versus 7.6%, respectively), and the survival benefit of the TMR–CABG combination was present after 1 year of follow-up (112). At the same time, a large retrospective analysis of data from the STS National Cardiac Database as well as a study of 169 patients from the Washington Hospital Center who underwent combined TMR–CABG, showed no difference in adjusted mortality rate compared with CABG alone (113,218). In short, a TMR–CABG combination does not appear to improve survival compared with CABG alone. In selected patients, however, such a combination may be superior to CABG alone in relieving angina.
2.11 Hybrid Coronary Revascularization: Recommendations
1. Hybrid coronary revascularization (defined as the planned combination of LIMA-to-LAD artery grafting and PCI of ≥1 non-LAD coronary arteries) is reasonable in patients with 1 or more of the following (219–225) (Level of Evidence: B):
a. Limitations to traditional CABG, such as heavily calcified proximal aorta or poor target vessels for CABG (but amenable to PCI);
b. Lack of suitable graft conduits;
c. Unfavorable LAD artery for PCI (i.e., excessive vessel tortuosity or CTO).
1. Hybrid coronary revascularization (defined as the planned combination of LIMA-to-LAD artery grafting and PCI of ≥1 non-LAD coronary arteries) may be reasonable as an alternative to multivessel PCI or CABG in an attempt to improve the overall risk-benefit ratio of the procedures. (Level of Evidence: C)
Hybrid coronary revascularization, defined as the planned combination of LIMA-to-LAD artery grafting and PCI of ≥1 non-LAD coronary arteries (226), is intended to combine the advantages of CABG (i.e., durability of the LIMA graft) and PCI (227). Patients with multivessel CAD (e.g., LAD and ≥1 non-LAD stenoses) and an indication for revascularization are potentially eligible for this approach. Hybrid revascularization is ideal in patients in whom technical or anatomic limitations to CABG or PCI alone may be present and for whom minimizing the invasiveness (and therefore the risk of morbidity and mortality) of surgical intervention is preferred (221) (e.g., patients with severe preexisting comorbidities, recent MI, a lack of suitable graft conduits, a heavily calcified ascending aorta, or a non-LAD coronary artery unsuitable for bypass but amenable to PCI, and situations in which PCI of the LAD artery is not feasible because of excessive tortuosity or CTO).
Hybrid coronary revascularization may be performed in a hybrid suite in one operative setting or as a staged procedure (i.e., PCI and CABG performed in 2 different operative suites, separated by hours to 2 days, but typically during the same hospital stay). Because most hospitals lack a hybrid operating room, staged procedures are usually performed. With the staged procedure, CABG before PCI is preferred, because this approach allows the interventional cardiologist to 1) verify the patency of the LIMA-to-LAD artery graft before attempting PCI of other vessels and 2) minimize the risk of perioperative bleeding that would occur if CABG were performed after PCI (i.e., while the patient is receiving DAPT). Because minimally invasive CABG may be associated with lower graft patency rates compared with CABG performed through a midline sternotomy, it seems prudent to angiographically image all grafts performed through a minimally invasive approach to confirm graft patency (221).
To date, no RCTs involving hybrid coronary revascularization have been published. Over the past 10 years, several small, retrospective series of hybrid revascularization using minimally invasive CABG and PCI have reported low mortality rates (0 to 2%) and event-free survival rates of 83% to 92% at 6 to 12 months of follow-up. The few series that have compared the outcomes of hybrid coronary revascularization with standard CABG report similar outcomes at 30 days and 6 months (219–225).
3 PCI Outcomes
3.1 Definitions of PCI Success
The success of a PCI procedure is best defined by 3 interrelated components: angiographic findings, procedural events, and clinical outcomes.
3.1.1 Angiographic Success
A successful PCI produces sufficient enlargement of the lumen at the target site to improve coronary artery blood flow. A successful balloon angioplasty is defined as the reduction of a minimum stenosis diameter to <50% with a final TIMI flow grade 3 (visually assessed by angiography) without side branch loss, flow-limiting dissection, or angiographic thrombus (7). For coronary stents, a minimum stenosis diameter of <20% (as visually assessed by angiography) has previously been the clinical benchmark of an optimal angiographic result. Given improvements in technology and techniques, as well as recognition of the importance of an adequately deployed stent to decrease the risks of stent restenosis and thrombosis (12,228,229), the writing committee concluded that a minimum diameter stenosis of <10% (with an optimal goal of as close to 0% as possible) should be the new benchmark for lesions treated with coronary stenting. As with balloon angioplasty, there should be final TIMI flow grade 3, without occlusion of a significant side branch, flow-limiting dissection, distal embolization, or angiographic thrombus. Problems with determining angiographic success include disparities between the visual assessment and computer-aided quantitative stenosis measurement and self-reporting of success in clinical reports or databases.
3.1.2 Procedural Success
A successful PCI should achieve angiographic success without associated in-hospital major clinical complications (e.g., death, MI, stroke, emergency CABG) (7,8). Issues regarding the diagnosis and prognostic implications of procedure-related MI are discussed in Sections 3.3 and 5.10.
3.1.3 Clinical Success
In the short term, a clinically successful PCI requires both anatomic and procedural success along with relief of signs and/or symptoms of myocardial ischemia. Long-term clinical success requires that the short-term clinical success remain durable and that relief of signs and symptoms of myocardial ischemia persist >9 months after the procedure. Restenosis is the principal cause of lack of long-term clinical success after a short-term clinical success has been achieved. Restenosis is not a complication; it is the expected biological response to vascular injury. The frequency of clinically important restenosis may be judged by the frequency with which subsequent revascularization procedures are performed on target arteries after the index procedure.
3.2 Predictors of Clinical Outcome After PCI
Factors associated with increased PCI complication rates include advanced age, diabetes, CKD, ACS, congestive heart failure, and multivessel CAD (8,230–232). Several models have been developed and refined over the past 2 decades to predict mortality with PCI (230,233–236). At present, perhaps the best accepted system is from the ACC National Cardiovascular Data Registry (NCDR) CathPCI Risk Score system, which uses clinical variables and PCI setting to predict inpatient mortality (Appendix 4A) (236). In general, these models perform very well (C statistic: approximately 0.90), although predictive capability decreases in high-risk patients.
Models have also been developed to predict procedural success. Presently, the modified ACC/AHA score (230) and the SCAI score (Appendix 4B) (237) are both in use, with the latter slightly outperforming the former. Discrimination as measured by the C statistic is generally good to very good (0.70 to 0.82), depending on the outcome variable and patient population.
The angiographic SYNTAX score (238) has been developed to predict long-term risk of MACE after multivessel intervention. The SYNTAX score and its potential utility in helping guide revascularization strategies are discussed in Section 2. Composite models including angiographic and clinical variables have been developed but generally require validation in larger cohorts of patients.
3.3 PCI Complications
In an analysis of the NCDR CathPCI database of patients undergoing PCI between 2004 and 2007, the overall in-hospital mortality rate was 1.27%, ranging from 0.65% in elective PCI to 4.81% in STEMI (236). Factors associated with an increased risk of PCI-related death include advanced age, comorbidities (e.g., diabetes, CKD, congestive heart failure), multivessel CAD, high-risk lesions, and the setting of PCI (e.g., STEMI, urgent or emergency procedure, cardiogenic shock) (56,230–232,236).
Causes of procedural and periprocedural MI include acute artery closure, embolization and no-reflow, side branch occlusion, and acute stent thrombosis. The incidence of procedure-related MI depends to a great degree on the definition of MI used, the patient population studied, and whether or not cardiac biomarkers are routinely assessed after PCI. The definition and clinical significance of PCI-related MI have been controversial. Criteria for defining a PCI-related MI have evolved over time (8,239,240). The 2007 universal definition of MI (240) states that after PCI, elevations of cardiac biomarkers above the 99th percentile upper reference limit indicate periprocedural myocardial necrosis. Increases of biomarkers >3 times the 99th percentile upper reference limit were designated as defining PCI-related MI (240). According to this definition, ≥15% of patients undergoing PCI would be defined as having periprocedural MI (241,242). Issues in procedure-related MI are discussed in Section 5.10.
The need for emergency CABG has dramatically decreased with advances in PCI technology, particularly coronary stents (243,244). Recently the NCDR reported the rate of emergency CABG at 0.4% (244). Procedure-related indications for CABG in 1 large series included coronary dissection (27%), acute artery closure (16%), perforation (8%), and failure to cross the lesion (8%) (245). The strongest predictors of the need for emergency CABG in several analyses are cardiogenic shock (OR: 11.4), acute MI or emergency PCI (OR: 3.2 to 3.8), multivessel disease (OR: 2.3 to 2.4), and type C lesion (OR: 2.6) (243,245). In-hospital mortality for emergency CABG ranges from 7.8% to 14% (243,245,246).
In a contemporary analysis from the NCDR, the incidence of PCI-related stroke was 0.22% (247). In-hospital mortality in patients with PCI-related stroke is 25% to 30% (247,248). Factors associated with an increased risk of stroke include fibrinolytic therapy administered before PCI (OR: 4.7), known cerebrovascular disease (OR: 2.20), STEMI as the indication for PCI (OR: 3.2), use of an intra-aortic balloon pump (IABP) (OR: 2.6), older age (OR: 1.17 per 5-year increase), and female sex (247–249). Initial imaging after a stroke in 1 small series revealed hemorrhagic etiology in 18%, ischemic etiology in 58%, and no clear etiology in 24% (248). One potential algorithm for the treatment of catheterization-related stroke has been recently proposed (250). This document includes no specific recommendations for the management of PCI-related stroke but refers the reader to the AHA/American Stroke Association guidelines for the management of adults with stroke (251).
Vascular complications from PCI are primarily related to vascular access. Important femoral vascular complications include access site hematoma, retroperitoneal hematoma, pseudoaneurysm, arteriovenous fistula, and arterial dissection and/or occlusion (252). The incidence of these vascular complications in various reports generally ranges from 2% to 6% and has decreased with time (249,253–257). Factors associated with an increased risk of vascular complication include age ≥70 years, body surface area <1.6 m2, emergency procedures, peripheral artery disease, periprocedural use of glycoprotein (GP) IIb/IIIa inhibitors, and female sex (if not corrected for body surface area) (249,253,254,257,258). Ultrasound guidance has been used for femoral artery access to potentially decrease complications (259). As discussed in Section 5.11, vascular closure devices have not been clearly demonstrated to decrease vascular complication rates. Radial site access decreases the rate of access-related bleeding and complications compared with femoral access (255,260). Loss of the radial pulse has been reported in ≤5% of radial procedures (261). Infrequent to rare complications occurring with the radial artery approach include compartment syndrome, pseudoaneurysm (<0.01%), and sterile abscess (occurring with previous-generation hydrophilic sheaths) (262). Radial artery spasm may occur and treatment at times may be challenging. Local hematomas may occur from small-branch vessel hydrophilic wire perforation or inexperience with wristband use.
The risk of coronary perforation is approximately 0.2%, most commonly by wire perforation during PCI for CTO or by ablative or oversized devices during PCI of heavily diseased or tortuous coronary arteries (263). The risk of tamponade and management of the perforation varies with the type of perforation (264).
Periprocedural bleeding is now recognized to be associated with subsequent mortality (265,266), and the avoidance of bleeding complications has become an important consideration in performing PCI. The risk of bleeding is associated with patient factors (e.g., advanced age, low body mass index, CKD, baseline anemia), as well as the degree of platelet and thrombin inhibition, vascular access site, and sheath size (267–269). Issues of periprocedural bleeding are discussed in Section 4.7.
The incidence of contrast-induced acute kidney injury (AKI) or “contrast nephropathy” in published reports depends on the definition of contrast nephropathy used and the frequency of risk factors for contrast-induced AKI in the patient population studied. Important risk factors for contrast-induced AKI include advanced age, CKD, congestive heart failure, diabetes, and the volume of contrast administered. Contrast-induced AKI and strategies to prevent it are discussed in Section 4.4.
4 Preprocedural Considerations
Table 4 contains recommendations for preprocedural considerations and interventions in patients undergoing PCI.
4.1 Cardiac Catheterization Laboratory Requirements
Defibrillators are considered by The Joint Commission to be life-support equipment requiring routine assessment and completion of appropriate logs. Many hospitals require periodic inspection of consoles for ancillary devices used in coronary intervention (e.g., Doppler wires, pressure-tipped sensor wires, and IVUS catheters). Point-of-care testing devices (e.g., activated clotting time and arterial blood gas machines) require routine calibration. Duration of storage of digital cine images is often mandated by law. Operating parameters for x-ray imaging equipment are adjusted at installation and periodically assessed by a qualified physicist in cooperation with the equipment manufacturer. Familiarity with radiation dose–reducing features of catheterization laboratory equipment and assistance from a qualified physicist are important for radiation dose minimization and image optimization.
An interventional cardiologist must be present in the laboratory for the duration of each procedure and is responsible for procedure outcome. Nursing and technical personnel are also required to be present in the catheterization laboratory, with specific staffing dependent on state requirements and laboratory caseload and mix. Catheterization laboratory technical staff may include nurse practitioners, registered nurses, licensed vocational or practical nurses, physician assistants, nursing assistants, radiology technicians, or catheterization laboratory technicians. All catheterization laboratory staff are usually certified in basic life support, advanced cardiovascular life support, and, where appropriate, pediatric advanced life support. Catheterization laboratory personnel have a nursing degree/certification or invasive cardiovascular credentials such as registered cardiovascular invasive specialist or American Society of Radiation technologists (305).
4.1.3 ‘Time-Out' Procedures
In 2003, The Joint Commission mandated a universal protocol requiring proper preoperative identification of the patient by the members of the catheterization laboratory team, marking of the operative site, and a final time-out just before the procedure (306). Although initially intended to prevent wrong-site surgery, this has been expanded to include all invasive procedures despite limited scientific evidence of its effectiveness (307). The intent of the time-out is for all members of the team to improve patient care by collectively discussing the case. The content of a time-out includes confirmation of the correct patient, correct side and site, agreement on the procedure to be performed, correct patient position, and availability of needed equipment, supplies, and implants. The time-out may be checklist driven or conversational, depending on laboratory preferences (308). The writing committee strongly endorses the practice of conducting a time-out before all PCI procedures.
4.2 Ethical Aspects
The 3 principles of medical ethics are beneficence, autonomy, and justice. Beneficence involves the physician's duty to act in the best interests of the patient and avoid maleficence, or harm (primum non nocere). Autonomy describes the physician's duty to help the patient maintain control over his or her medical treatments. Justice describes the physician's duty to treat the individual patient responsibly with due consideration of other patients and stakeholders in the healthcare system. Ethical considerations specific to PCI have been previously discussed (309) and are highlighted below:
• Place the patient's best interest first and foremost when making clinical decisions (beneficence).
• Ensure that patients actively participate in decisions affecting their care (autonomy).
• Consider how decisions regarding one patient may also affect other patients and providers (justice).
• Plan and perform procedures and provide care with the intention of improving the patient's quality of life and/or decreasing the risk of mortality, independent of reimbursement considerations and without inappropriate bias or influence from industry, administrators, referring physicians, or other sources.
• Before performing procedures, obtain informed consent after giving an explanation regarding the details of the procedure and the risks and benefits of both the procedure and alternatives to the procedure.
• Plan and perform procedures according to standards of care and recommended guidelines, and deviate from them when appropriate or necessary in the care of individual patients.
• Seek advice, assistance, or consultation from colleagues when such consultation would benefit the patient.
4.2.1 Informed Consent
Obtaining informed consent for procedures is a legal and ethical necessity. Ideally, informed consent is obtained long enough before the procedure that the patient can fully consider informed consent issues and discuss them with family or other providers, avoiding any sense of coercion. Ad hoc PCI, or PCI immediately following diagnostic procedures, presents special problems. When informed consent for PCI is obtained before diagnostic catheterization is performed, it is impossible to predict the levels of risk and benefit from an ad hoc PCI (310,311). If diagnostic catheterization reveals anatomy that poses a particularly high risk or for which the superiority of PCI compared with other strategies is unclear, the precatheterization informed consent discussion may be inadequate. In such cases, deferral of PCI until additional informed consent discussions and/or consultations occur may be appropriate, even though it inconveniences the patient and the healthcare system. It is the responsibility of the interventionalist to act in the patient's best interest in these circumstances.
Informed consent before emergency procedures is particularly difficult (312–314). The patient presenting with STEMI is usually in distress and often sedated, making true informed consent impossible. Rapid triage, transport, and treatment of STEMI patients create a pressured atmosphere that by necessity limits a prolonged and detailed informed consent process. Nevertheless, the interventionist must attempt to provide information about the risks and benefits of different strategies to the patient and family and balance the benefit of thorough discussion with the benefits of rapid intervention.
4.2.2 Potential Conflicts of Interest
Decisions about the performance and timing of PCI may pose additional ethical dilemmas. When considering whether to perform multivessel PCI in 1 stage versus 2 stages, safety and convenience for the patient must guide the decision, regardless of payment policies that maximize reimbursement when PCI is staged (311). A separate issue is self-referral, through which diagnostic catheterization often leads seamlessly to PCI by the same operator (315). The interventionist has an ethical obligation to the patient to consider all treatment options, consult with additional specialists (e.g., cardiac surgeons) when their input would be helpful to the patient, avoid unnecessary interventional procedures, and allow the patient to consult family members and other physicians (311).
4.3 Radiation Safety: Recommendation
1. Cardiac catheterization laboratories should routinely record relevant available patient procedural radiation dose data (e.g., total air kerma at the international reference point [Ka,r], air kerma air product [PKA], fluoroscopy time, number of cine images), and should define thresholds with corresponding follow-up protocols for patients who receive a high procedural radiation dose. (Level of Evidence: C)
The issue of radiation exposure during imaging procedures has received increased attention, and the writing committee believes that radiation safety should be addressed in this guideline. Current standards for cardiac catheterization laboratories include the following:
• Specific procedures and policies are in place to minimize patient (and operator) risk.
• A radiation safety officer coordinates all radiation safety issues and works conjointly with the medical or health physicist.
• Patient radiation exposure is reduced to as low a level as reasonably can be achieved.
• Patients at increased risk for high procedural radiation exposure are identified.
• Informed consent includes radiation safety information, particularly for the high-risk patient.
A basic primer on the physics of x-ray imaging, essential to the safe practice of radiation dose management, has been published in an ACCF/AHA/Heart Rhythm Society/SCAI clinical competence statement (316). Appendix 4C summarizes strategies to minimize patient and operator radiation exposure. Adverse radiation effects are now well recognized as infrequent but potentially serious complications of prolonged interventional procedures (317). Fluoroscopic time does not include cine acquisition imaging and is therefore not an accurate measure of patient radiation dose. Total air kerma at the interventional reference point (Ka,r, in Gy) and air kerma area product (PKA, in Gycm2) are required to be reported on interventional x-ray systems since 2006. These are useful in the assessment of potential tissue adverse effects or long-term radiation sequelae, respectively, and it is reasonable to include them in the catheterization record at the conclusion of each procedure. Appendix 4D summarizes considerations for patient follow-up based on radiation dose during the procedure (317).
4.4 Contrast-Induced AKI: Recommendations
1. Patients should be assessed for risk of contrast-induced AKI before PCI (270,271). (Level of Evidence: C)
2. Patients undergoing cardiac catheterization with contrast media should receive adequate preparatory hydration (272–275). (Level of Evidence: B)
3. In patients with CKD (creatinine clearance <60 mL/min), the volume of contrast media should be minimized (276–278). (Level of Evidence: B)
CLASS III: NO BENEFIT
1. Administration of N-acetyl-L-cysteine is not useful for the prevention of contrast-induced AKI (279–283). (Level of Evidence: A)
SeeOnline Data Supplements 16 to 18for additional data regarding contrast-induced AKI.
Contrast-induced AKI or “contrast nephropathy” is one of the leading causes of hospital-acquired AKI. Major risk factors for contrast-induced AKI include advanced age, CKD, congestive heart failure, diabetes, and the volume of contrast administered. A risk-scoring system is available to predict the risk of contrast nephropathy using these risk factors and additional variables (270). Thus far, the only strategies clearly shown to reduce the risk of contrast-induced AKI are hydration and minimizing the amount of contrast media. Other than saline hydration, measures that were believed to reduce the risk of contrast-induced AKI have been found to be neutral, to have deleterious effects, or to be characterized by heterogeneous and conflicting data.
Studies of hydration to reduce the risk of contrast-induced AKI suggest that isotonic saline is preferable to half isotonic saline, intravenous (IV) hydration is preferable to oral hydration, hydration for hours before and after exposure to contrast media is preferable to a bolus administration of saline immediately before or during contrast media exposure, and administration of isotonic saline alone is preferable to administration of isotonic saline plus mannitol or furosemide (272–275,320). On the basis of these studies, a reasonable hydration regimen would be isotonic crystalloid (1.0 to 1.5 mL/kg per hour) for 3 to 12 hours before the procedure and continuing for 6 to 24 hours after the procedure (272–275,284,320,321).
Prior studies of N-acetyl-L-cysteine and sodium bicarbonate have produced conflicting results. Some, often small, earlier studies suggested benefit, but many other more contemporary studies and meta-analyses found no clear evidence of benefit, and there are potential issues of publication bias and poor methodology issues in several analyses (279–282,322–332). The recently completed largest randomized study on N-acetyl-L-cysteine and contrast nephropathy in patients undergoing angiographic procedures, ACT (Acetylcysteine for Contrast-Induced Nephropathy Trial), demonstrated no benefit in primary or secondary endpoints. An updated meta-analysis using only high-quality trials similarly demonstrated no benefit (283). Taken as a whole, these studies do not support any recommendation for the use of N-acetyl-L-cysteine, they do, however, provide sufficient data to conclude that N-acetyl-L-cysteine does not prevent contrast-induced AKI in patients undergoing angiographic procedures.
The correlation between the volume of contrast media and the risk of contrast-induced AKI has been documented in several studies (276,277). Thus, minimization of contrast media volume is important to prevent contrast-induced AKI in patients undergoing angiography. The volume of contrast already administered during diagnostic catheterization is an important factor when considering possible “ad hoc” PCI.
Comparative studies of different contrast media (e.g., low-osmolar versus iso-osmolar, one agent versus another agent) have produced variable and sometimes contradictory results (334–339). Thus, current data are insufficient to justify specific recommendations about low- and iso-osmolar contrast media. This issue is discussed in detail in the 2011 UA/NSTEMI focused update (340). For a further discussion of contrast media and PCI, the reader is referred to a position statement by the SCAI (284).
4.5 Anaphylactoid Reactions: Recommendations
1. Patients with prior evidence of an anaphylactoid reaction to contrast media should receive appropriate steroid and antihistamine prophylaxis before repeat contrast administration (252,284–286). (Level of Evidence: B)
CLASS III: NO BENEFIT
1. In patients with a prior history of allergic reactions to shellfish or seafood, anaphylactoid prophylaxis for contrast reaction is not beneficial (287–289). (Level of Evidence: C)
The incidence of anaphylactoid reactions to contrast media is ≤1%, and the incidence of severe reactions may be as low as 0.04% (284). Limited data suggest that in patients with a history of prior anaphylactoid reaction, the recurrence rate without prophylaxis is in the range of 16% to 44% (341). Adequate pretreatment of patients with prior anaphylactoid reactions reduces the recurrence rate to close to zero (284–286). A regimen of 50 mg of prednisone administered 13 hours, 7 hours, and 1 hour before the procedure (as well as 50 mg of diphenhydramine 1 hour before the procedure) has been shown to reduce the risk of recurrent anaphylactoid reaction (286). In practice, a regimen of 60 mg of prednisone the night before and morning of the procedure (as well as 50 mg of diphenhydramine 1 hour before the procedure) is often used (252). There are minimal data on the “pretreatment” of patients undergoing emergency PCI (342). One group has suggested IV steroids (e.g., 80 mg to 125 mg of methylprednisolone, 100 mg of hydrocortisone sodium succinate), as well as oral or IV diphenhydramine and possible IV cimetidine (284). For a more detailed discussion of issues related to contrast-induced anaphylactoid reactions, the reader is referred to several dedicated discussions on contrast agents (284,341).
There are no data to suggest that those patients with seafood or shellfish allergies are at risk for an anaphylactoid reaction from exposure to contrast media. Iodine does not mediate seafood, shellfish, or contrast media reactions. The common misconception that seafood allergies and contrast reactions are cross-reactions to iodine probably arose from a survey published in 1975 in which 15% of patients with a history of contrast reaction reported a personal history of shellfish allergy, but nearly identical proportions of patients reported allergies to other foods, such as milk and egg, in the same survey (287). Pretreatment of patients with steroids based only on a history of seafood or shellfish allergy has a small but non-zero risk of adverse effect (e.g., hyperglycemia in a patient with diabetes) without any demonstrated benefit (288,289).
4.6 Statin Treatment: Recommendation
1. Administration of a high-dose statin is reasonable before PCI to reduce the risk of periprocedural MI. (Level of Evidence: A for statin-naïve patients [290–296]; Level of Evidence: B for those on chronic statin therapy )
SeeOnline Data Supplement 19for additional data regarding preprocedural statin treatment.
Statins have long-term benefits in patients with CAD (343,344) and ACS (345,346). The benefits of statins in ACS begin early, before substantial lipid lowering has occurred (345,347), suggesting pleiotropic effects of statins. These might include anti-inflammatory effects, improvement of endothelial function, decrease of oxidative stress, or inhibition of thrombogenic responses (348). Statins were beneficial when pretreatment was started from 7 days to just before PCI (290–297).
4.7 Bleeding Risk: Recommendation
1. All patients should be evaluated for risk of bleeding before PCI. (Level of Evidence: C)
Periprocedural bleeding is now recognized as a major risk factor for subsequent mortality (265,266). Bleeding may lead to mortality directly (because of the bleeding event) or through ischemic complications that occur when antiplatelet or anticoagulant agents are withdrawn in response to the bleeding. Bleeding may also be a marker of comorbidities associated with worse prognosis (e.g., occult cancer). The risk of bleeding is associated with a number of patient factors (e.g., advanced age, low body mass index, CKD, baseline anemia), as well as the degree of platelet and thrombin inhibition, vascular access site, and sheath size (267–269). The overall approach to PCI should be individualized to minimize both ischemic and bleeding risks.
Measures to minimize the risks of bleeding complications are discussed in several sections of this guideline. These include use of anticoagulation regimens associated with a lower risk of bleeding, weight-based dosing of heparin and other agents, use of activated clotting times to guide unfractionated heparin (UFH) dosing, avoidance of excess anticoagulation (349), dosing adjustments in patients with CKD (e.g., eptifibatide, tirofiban, bivalirudin) (350), use of radial artery access site (255), and avoidance of femoral vein cannulation when possible. Vascular closure devices have not been clearly demonstrated to decrease bleeding complications and are discussed in detail in Section 5.11.
4.8 PCI in Hospitals Without On-Site Surgical Backup: Recommendations
1. Primary PCI is reasonable in hospitals without on-site cardiac surgery, provided that appropriate planning for program development has been accomplished (351,352). (Level of Evidence: B)
1. Elective PCI might be considered in hospitals without on-site cardiac surgery, provided that appropriate planning for program development has been accomplished and rigorous clinical and angiographic criteria are used for proper patient selection (352–354). (Level of Evidence: B)
CLASS III: HARM
1. Primary or elective PCI should not be performed in hospitals without on-site cardiac surgery capabilities without a proven plan for rapid transport to a cardiac surgery operating room in a nearby hospital or without appropriate hemodynamic support capability for transfer. (Level of Evidence: C)
SeeOnline Data Supplement 20for additional data regarding hospitals without on-site surgical backup.
Primary and elective PCI can be performed at hospitals without on-site cardiac surgical backup with a high success rate, low in-hospital mortality rate, and low rate for emergency CABG (351,353,354). The best outcomes for patients with STEMI are achieved at hospitals with 24/7 access to primary PCI (355). Criteria for the performance of PCI without on-site surgical backup have been proposed in an SCAI expert consensus document (352). Consideration of elective PCI without on-site cardiac surgical backup is thought to be appropriate only when performed by experienced operators with complication rates and outcomes equivalent or superior to national benchmarks. Accurate assessment of complication rates and patient outcomes via a regional or national data registry, so that outcomes can be compared with established benchmarks, is an important quality control component of any PCI program. Desires for personal or institutional financial gain, prestige, market share, or other similar motives are not appropriate considerations for initiation of PCI programs without on-site cardiac surgery. It is only appropriate to consider initiation of a PCI program without on-site cardiac surgical backup if this program will clearly fill a void in the healthcare needs of the community. Competition with another PCI program in the same geographic area, particularly an established program with surgical backup, may not be in the best interests of the community.
Tables 5 and 6⇑⇑ list the SCAI expert consensus document requirements for PCI programs without on-site surgical backup. Table 7 gives the requirements for primary PCI and emergency CABG at hospitals without on-site cardiac surgery, and Table 8 lists the requirements for patient and lesion selection and backup strategy for nonemergency PCI (352).
5 Procedural Considerations
5.1 Vascular Access: Recommendation
1. The use of radial artery access can be useful to decrease access site complications (255,260,356–362). (Level of Evidence: A)
SeeOnline Data Supplement 21for additional data regarding radial access.
Femoral artery access remains the most commonly used approach in patients undergoing PCI in the United States. Choosing a femoral artery puncture site is facilitated by fluoroscopic landmark identification or ultrasound guidance. Low punctures have a high incidence of peripheral artery complications, whereas high punctures have an increased risk of retroperitoneal hemorrhage. In patients with a synthetic graft, arterial access is possible after the graft is a few months old and complication rates are not increased (254).
Radial site access is used frequently in Europe and Canada but not in the United States (260). A learning curve exists for the radial approach that will affect procedure time and radiation dose, with a trend toward lower procedural success rates for radial versus femoral access (255). However, compared with femoral access, radial access decreases the rate of access-related bleeding and complications (255,260,363). In a recent large RCT comparing radial and femoral access in patients with ACS undergoing PCI, there was no difference in the primary composite endpoint (death, MI, stroke, major bleeding), although there was a lower rate of vascular complications with the use of radial access (362). Radial artery access is particularly appealing in patients with coagulopathy, elevated international normalized ratio due to warfarin, or morbid obesity.
5.2 PCI in Specific Clinical Situations
5.2.1 UA/NSTEMI: Recommendations
1. An early invasive strategy (i.e., diagnostic angiography with intent to perform revascularization) is indicated in UA/NSTEMI patients who have refractory angina or hemodynamic or electrical instability (without serious comorbidities or contraindications to such procedures) (207,364,365). (Level of Evidence: B)
2. An early invasive strategy (i.e., diagnostic angiography with intent to perform revascularization) is indicated in initially stabilized UA/NSTEMI patients (without serious comorbidities or contraindications to such procedures) who have an elevated risk for clinical events (207,365–367). (Level of Evidence: A)
3. The selection of PCI or CABG as the means of revascularization in the patient with ACS should generally be based on the same considerations as those without ACS (53,156,207,368). (Level of Evidence: B)
CLASS III: NO BENEFIT
1. An early invasive strategy (i.e., diagnostic angiography with intent to perform revascularization) is not recommended in patients with extensive comorbidities (e.g., liver or pulmonary failure, cancer) in whom (Level of Evidence: C)
a. The risks of revascularization and comorbid conditions are likely to outweigh the benefits of revascularization,
b. There is a low likelihood of ACS despite acute chest pain, or
c. Consent to revascularization will not be granted regardless of the findings.
The goals of coronary angiography and revascularization in UA/NSTEMI patients are to reduce the risk of death and MI and provide symptom relief. To improve prognosis, early risk stratification is essential for selection of medical and/or invasive treatment strategies. Indications for revascularization depend on the patient's clinical risk characteristics and coronary anatomy and are in general stronger in the presence of high-risk clinical presentation (e.g., dynamic electrocardiogram [ECG] changes, elevated troponin, high Global Registry of Acute Coronary Events score), recurrent symptoms, threatened viable myocardium, CKD, and larger ischemic burden (Appendix 4E). For choice of revascularization technique, the anatomical considerations are generally those used for stable CAD, although PCI may initially be performed in the index lesion to stabilize the patient (Section 2).
Contemporary studies variably comparing strategies of very early (within hours of admission), early (within 24 hours of admission), and delayed (1 to 7 days after admission) cardiac catheterization and revascularization support a strategy of early angiography and revascularization to reduce the risk of recurrent ischemia and MI, particularly among those at high risk (e.g., Global Registry of Acute Coronary Events score >140) (367,369,370), whereas a delayed approach is reasonable in low-intermediate risk patients (based on clinical course). There is no evidence that incremental benefit is derived by angiography and PCI performed within the first few hours of hospital admission (207,367,371–378).
5.2.2 ST-Elevation Myocardial Infarction
126.96.36.199 Coronary Angiography Strategies in STEMI: Recommendations
1. A strategy of immediate coronary angiography with intent to perform PCI (or emergency CABG) in patients with STEMI is recommended for
1. A strategy of immediate coronary angiography (or transfer for immediate coronary angiography) with intent to perform PCI is reasonable for patients with STEMI, a moderate to large area of myocardium at risk, and evidence of failed fibrinolysis (385,386). (Level of Evidence: B)
2. A strategy of coronary angiography (or transfer for coronary angiography) 3 to 24 hours after initiating fibrinolytic therapy with intent to perform PCI is reasonable for hemodynamically stable patients with STEMI and evidence for successful fibrinolysis when angiography and revascularization can be performed as soon as logistically feasible in this time frame (387–391). (Level of Evidence: A)
1. A strategy of coronary angiography performed before hospital discharge might be reasonable in stable patients with STEMI who did not undergo cardiac catheterization within 24 hours of STEMI onset. (Level of Evidence: C)
CLASS III: NO BENEFIT
1. A strategy of coronary angiography with intent to perform PCI is not recommended in patients with STEMI in whom the risks of revascularization are likely to outweigh the benefits or when the patient or designee does not want invasive care. (Level of Evidence: C)
The historical reperfusion strategies of “primary PCI,” “immediate PCI,” “rescue PCI,” “deferred PCI,” “facilitated PCI,” and the “pharmacoinvasive strategy” have evolved in parallel with advances in antithrombotic therapy and STEMI prehospital and hospital systems of care. The clinical challenge in primary PCI is achieving rapid time to treatment and increasing patient access to this preferred reperfusion strategy. The clinical challenge in patients treated with fibrinolytic therapy is deciding for whom and when to perform coronary angiography.
In unstable patients (e.g., severe heart failure or cardiogenic shock, hemodynamically compromising ventricular arrhythmias) not treated initially with primary PCI, a strategy of immediate coronary angiography with intent to perform PCI is implemented unless invasive management is considered futile or unsuitable given the clinical circumstances (383,384).
In stable patients treated with fibrinolytic therapy and clinical suspicion of reperfusion failure, a strategy of immediate coronary angiography followed by PCI improves outcome in those at high risk (385,386). Such a strategy is also implemented in patients with evidence for infarct artery reocclusion (Table 9). The clinical diagnosis of failed fibrinolysis is difficult but is best made when there is <50% ST-segment resolution 90 minutes after initiation of therapy in the lead showing the greatest degree of ST-segment elevation at presentation. Given the association between bleeding events and adverse cardiac events, a reasonable approach is to select moderate- and high-risk patients for PCI and treat low-risk patients with medical therapy. ECG and clinical findings of anterior MI or inferior MI with right ventricular involvement or precordial ST-segment depression, as well as ongoing pain, usually predicts increased risk and the greatest potential benefit (392). Conversely, patients with symptom resolution, improving ST-segment elevation, or inferior MI localized to 3 ECG leads probably gain little benefit.
In stable patients treated with fibrinolytic therapy and clinical evidence for successful reperfusion, an early invasive strategy with cardiac catheterization performed within 24 hours decreases reinfarction and recurrent ischemic events (388,390,391). Because of the associated increased bleeding risk, very early (<2 to 3 hours) catheterization after administration of fibrinolytic therapy with intent to perform revascularization should be reserved for patients with evidence of failed fibrinolysis and significant myocardial jeopardy for whom immediate angiography and revascularization would be appropriate (393).
188.8.131.52 Primary PCI of the Infarct Artery: Recommendations
1. Primary PCI should be performed in patients within 12 hours of onset of STEMI (379–382). (Level of Evidence: A)
2. Primary PCI should be performed in patients with STEMI presenting to a hospital with PCI capability within 90 minutes of first medical contact as a systems goal (394,395). (Level of Evidence: B)
3. Primary PCI should be performed in patients with STEMI presenting to a hospital without PCI capability within 120 minutes of first medical contact as a systems goal (396–398). (Level of Evidence: B)
4. Primary PCI should be performed in patients with STEMI who develop severe heart failure or cardiogenic shock and are suitable candidates for revascularization as soon as possible, irrespective of time delay (383,384). (Level of Evidence: B)
5. Primary PCI should be performed as soon as possible in patients with STEMI and contraindications to fibrinolytic therapy with ischemic symptoms for less than 12 hours (399,400). (Level of Evidence: B)
1. Primary PCI is reasonable in patients with STEMI if there is clinical and/or electrocardiographic evidence of ongoing ischemia between 12 and 24 hours after symptom onset (401–403). (Level of Evidence: B)
1. Primary PCI might be considered in asymptomatic patients with STEMI and higher risk presenting between 12 and 24 hours after symptom onset. (Level of Evidence: C)
CLASS III: HARM
1. PCI should not be performed in a noninfarct artery at the time of primary PCI in patients with STEMI without hemodynamic compromise (404–408). (Level of Evidence: B)
Primary PCI is preferred to fibrinolytic therapy when time-to-treatment delays are short and the patient presents to a high-volume, well-equipped center staffed with expert interventional cardiologists and skilled support staff. Compared with fibrinolytic therapy in RCTs, primary PCI produces higher rates for infarct artery patency, TIMI flow grade 3, and lower rates for recurrent ischemia, reinfarction, emergency repeat revascularization procedures, intracranial hemorrhage, and death (379). Early, successful PCI also greatly decreases the complications of STEMI that result from longer ischemic times or unsuccessful fibrinolytic therapy, allowing earlier hospital discharge and resumption of daily activities. The greatest mortality benefit of primary PCI is in high-risk patients. PCI outcomes may not be as successful with prolonged time-to-treatment or low-volume hospitals and operators (Table 10).
Several reports have shown excellent outcomes for patients with STEMI undergoing interhospital transfer where first medical contact–to-door balloon time modestly exceeded the systematic goal of <90 minutes (396–398,409). In these reports, the referring hospital and the receiving hospital established a transfer protocol that minimized transfer delays, and outcomes were similar to those of direct-admission patients. On the basis of these results, the PCI and STEMI guideline writing committees have modified the first medical contact–to-device time goal from 90 minutes to 120 minutes for interhospital transfer patients (397), while emphasizing that systems should continue to strive for times ≤90 minutes. Hospitals that cannot meet these criteria should use fibrinolytic therapy as their primary reperfusion strategy.
PCI of a noninfarct artery at the time of primary PCI in stable patients is associated with worse clinical outcomes unless the patient is in cardiogenic shock where PCI of a severe stenosis in a coronary artery supplying a large territory of myocardium might improve hemodynamic stability (404,406,408). Delayed PCI can be performed in noninfarct arteries at a later time if clinically indicated (410–412).
184.108.40.206 Delayed or Elective PCI in Patients With STEMI: Recommendations
1. PCI is reasonable in patients with STEMI and clinical evidence for fibrinolytic failure or infarct artery reocclusion (385,386). (Level of Evidence: B)
2. PCI is reasonable in patients with STEMI and a patent infarct artery 3 to 24 hours after fibrinolytic therapy (390,391). (Level of Evidence: B)
3. PCI is reasonable in patients with STEMI who demonstrate ischemia on noninvasive testing (410,411). (Level of Evidence: B)
1. PCI of a hemodynamically significant stenosis in a patent infarct artery greater than 24 hours after STEMI may be considered as part of an invasive strategy (413–417). (Level of Evidence: B)
CLASS III: NO BENEFIT
1. PCI of a totally occluded infarct artery greater than 24 hours after STEMI should not be performed in asymptomatic patients with 1- or 2-vessel disease if patients are hemodynamically and electrically stable and do not have evidence of severe ischemia (418–420). (Level of Evidence: B)
Studies and meta-analyses suggest potential benefit for PCI in fibrinolytic failure (385,386). In stable patients treated with fibrinolytic therapy and clinical evidence for successful reperfusion, an early invasive strategy with cardiac catheterization performed within 24 hours decreases reinfarction and recurrent ischemic events (388,390,391).
PCI for a hemodynamically significant stenosis in a patent infarct artery >24 hours after STEMI as part of a revascularization strategy improves outcome (410,411,413–417). PCI of an occluded infarct artery 1 to 28 days after MI in asymptomatic patients without evidence of myocardial ischemia has no incremental benefit beyond optimal medical therapy with aspirin, beta blockers, angiotensin-converting enzyme inhibitors, and statins in preserving LV function and preventing subsequent cardiovascular events (418–420). It is important to note that elective PCI of an occluded infarct artery has not been studied in patients with New York Heart Association functional class III or IV heart failure, rest angina, serum creatinine >2.5 mg/dL, left main or 3-vessel CAD, clinical instability, or severe inducible ischemia on stress testing in an infarct zone that is not akinetic or dyskinetic.
5.2.3 Cardiogenic Shock: Recommendations
1. PCI is recommended for patients with acute MI who develop cardiogenic shock and are suitable candidates (384,421–423). (Level of Evidence: B)
2. A hemodynamic support device is recommended for patients with cardiogenic shock after STEMI who do not quickly stabilize with pharmacological therapy (384,424–427). (Level of Evidence: B)
SeeOnline Data Supplement 22for additional data regarding cardiogenic shock.
Cardiogenic shock is the leading cause of in-hospital mortality complicating STEMI. Revascularization is the only treatment proven to decrease mortality rates (384,421–423). Although revascularization is almost always accomplished through PCI, selected patients with severe 3-vessel or left main disease can benefit from emergency CABG. Revascularization attempts may be futile and not indicated in cases of severe multiorgan failure (427). Patient selection for revascularization is more important in the elderly, but several observational reports demonstrate acceptable outcomes in patients with few comorbidities and a reasonable potential for survival (428–431). Patients who present to hospitals without PCI capability are usually emergently transported to a PCI center, because mortality without transfer is markedly elevated (432).
220.127.116.11 Procedural Considerations for Cardiogenic Shock
Patients with cardiogenic shock should receive standard pharmacological therapies, including aspirin, a P2Y12 receptor antagonist, and anticoagulation (427,433). Inotropic and vasopressor therapy improves perfusion pressure. Historically, negative inotropes and vasodilators are avoided. IV GP IIb/IIIa inhibitors have been shown to provide benefit in observational studies but not in 1 small RCT (433).
Endotracheal intubation and mechanical ventilation with positive end-expiratory pressure is usually necessary in patients with respiratory failure. Placement of a temporary pacemaker is indicated for patients with bradycardia or high-degree atrioventricular heart block. A pulmonary artery catheter can provide information to dose and titrate inotropes and pressors. Further hemodynamic support is available with IABP counterpulsation or percutaneous LV assist devices, although no data support a reduction in mortality rates (434).
Contrast medium injections should be minimized. Orthogonal angiograms of the left coronary artery and a left anterior oblique angiogram of the right coronary artery are usually sufficient to identify the infarct artery (435). Although most patients undergoing revascularization will receive a stent as part of the procedure, there are conflicting data on the impact of stenting over balloon angioplasty. Some studies reveal lower mortality rates (436–438), whereas others reveal no benefit (439) or higher mortality rates (440). There are no data comparing the choice of BMS versus DES in cardiogenic shock; however, BMS are often used because compliance with long-term DAPT is often unclear in the emergency setting.
In patients with multivessel disease, revascularization of the noninfarct artery may be necessary to maximize myocardial perfusion. Alternatively, in patients with multivessel disease and particularly left main disease, emergency CABG as a primary reperfusion strategy may be preferred (50,441). Refractory cardiogenic shock unresponsive to revascularization may necessitate institution of more intensive cardiac support with a ventricular assist device or other hemodynamic support devices to allow for myocardial recovery or subsequent cardiac transplantation in suitable patients.
5.2.4 Revascularization Before Noncardiac Surgery: Recommendations
1. For patients who require PCI and are scheduled for elective noncardiac surgery in the subsequent 12 months, a strategy of balloon angioplasty, or BMS implantation followed by 4 to 6 weeks of DAPT, is reasonable (442–448). (Level of Evidence: B)
2. For patients with DES who must undergo urgent surgical procedures that mandate the discontinuation of DAPT, it is reasonable to continue aspirin if possible and restart the P2Y12 inhibitor as soon as possible in the immediate postoperative period (444). (Level of Evidence: C)
CLASS III: HARM
1. Routine prophylactic coronary revascularization should not be performed in patients with stable CAD before noncardiac surgery (449,450). (Level of Evidence: B)
2. Elective noncardiac surgery should not be performed in the 4 to 6 weeks after balloon angioplasty or BMS implantation or the 12 months after DES implantation in patients in whom the P2Y12 inhibitor will need to be discontinued perioperatively (208,447,451,452). (Level of Evidence: B)
The 2007 and 2009 ACC/AHA Guidelines on Perioperative Cardiovascular Evaluation and Care for Noncardiac Surgery gave detailed recommendations for the evaluation of patients undergoing noncardiac surgery (444). Patients with evidence of ACS should receive standard therapy, including early revascularization, to minimize the risk of adverse events. Patients with known significant left main or 3-vessel CAD who would otherwise benefit from revascularization in terms of survival or symptomatic relief also generally undergo revascularization before elective noncardiac surgery.
Two RCTs (449,450) found no benefit with routine preoperative revascularization before noncardiac surgery. Noncardiac surgery early after coronary stenting, particularly in the first 4 weeks, is associated with a high risk of stent thrombosis and death (444,446,448). When emergency surgery is necessary, the patient should proceed to surgery without prior PCI. When surgery is required within 30 days and coronary revascularization is required before surgery, many clinicians perform balloon angioplasty alone to avoid the need for DAPT. In situations where preoperative revascularization is required and surgery can be deferred for at least 30 days, many clinicians use BMS and discontinue DAPT after 30 days. If surgery is elective and can be deferred for 1 year, most clinicians would consider DES to reduce the long-term risk of restenosis. A dilemma occurs when a patient has undergone PCI and then unexpectedly requires noncardiac surgery. Many patients can undergo surgery on DAPT, where the risk-benefit ratio will favor continued dual antiplatelet inhibition. If it is necessary to hold P2Y12 inhibitor therapy, most clinicians will still continue aspirin uninterrupted during the perioperative period if the bleeding risk is not prohibitive. When the risk of delaying surgery or performing surgery while the patient is on DAPT exceeds the risk of stent thrombosis from stopping DAPT, the P2Y12 inhibitor is stopped before surgery and resumed as soon as possible afterward. No P2Y12 inhibitor “bridging” strategy (e.g., GP IIb/IIIa inhibitor, antithrombin therapy) has been validated.
5.3 Coronary Stents: Recommendations
1. Before implantation of DES, the interventional cardiologist should discuss with the patient the need for and duration of DAPT and the ability of the patient to comply with and tolerate DAPT (212). (Level of Evidence: C)
2. DES are useful as an alternative to BMS to reduce the risk of restenosis in cases in which the risk of restenosis is increased and the patient is likely to be able to tolerate and comply with prolonged DAPT (Level of Evidence: A for elective PCI [453,453a,454–456]; Level of Evidence: C for UA/NSTEMI (453); Level of Evidence: A for STEMI [453,456–459]).
3. Balloon angioplasty or BMS should be used in patients with high bleeding risk, inability to comply with 12 months of DAPT, or anticipated invasive or surgical procedures within the next 12 months, during which time DAPT may be interrupted (208,460–462). (Level of Evidence: B)
CLASS III: HARM
1. PCI with coronary stenting should not be performed if the patient is not likely to be able to tolerate and comply with DAPT (208–211). (Level of Evidence: B)
2. DES should not be implanted if the patient is not likely to be able to tolerate and comply with prolonged DAPT or this cannot be determined before stent implantation (208,460–462). (Level of Evidence: B)
Coronary stent implantation is commonly performed during PCI to prevent recoil, abrupt closure, and late restenosis (463,464). BMS are composed of either stainless steel or cobalt chromium alloys. Because the risk of stent thrombosis is greatest within the first 30 days after implantation, the use of DAPT is required for 30 days after implantation of BMS (208).
In the United States, 4 types of DES are currently approved: sirolimus-eluting stents, paclitaxel-eluting stents, zotarolimus-eluting stents, and everolimus-eluting stents. DES vary according to stent scaffold material and design, drug content, and the polymer used for drug elution; however, several common clinical features are present. First, sirolimus-eluting stents, paclitaxel-eluting stents, and zotarolimus-eluting stents have been demonstrated in RCTs to be associated with a reduced need for repeat revascularization and no increase in death or MI compared with BMS at 4 years' follow-up (465). Everolimus-eluting stents have been demonstrated in RCTs to be associated with a lower need for repeat revascularization than paclitaxel-eluting stents, and, by inference, a lower risk for repeat revascularization than BMS (466,467), with no increase in death or MI at 2-year follow-up (468). Second, each of these stents is presumed to be associated with delayed healing based on pathologic studies and longer periods of risk for thrombosis compared with BMS and require longer duration of DAPT (469). In the RCTs that led to the U.S. Food and Drug Administration (FDA) approval of these stents, the recommended minimum duration of DAPT therapy was 3 to 6 months. Recently, the consensus of clinical practice has been 12 months of DAPT following DES implantation to avoid late (after 30 days) thrombosis (208), based on observational studies of paclitaxel-eluting stents and sirolimus-eluting stents that indicate lower risk of late stent thrombosis with >6 months of therapy (212). Extending DAPT beyond 1 year is considered reasonable by some practitioners based on observational data analysis (212), but RCTs to determine whether longer DAPT is associated with reduction in stent thrombosis risk have not been completed. Finally, DES therapy is more expensive than BMS. Cost-effectiveness analysis has shown a reduction in total cost associated with DES because of avoidance of repeat procedures, yet it may be reasonable to consider use of BMS in patient subsets in which the risk of restenosis is low (470).
This risk-benefit profile is most favorable for DES over BMS when the risk of restenosis with BMS is high (Table 11). Pooled and meta-analyses have demonstrated that in patients with diabetes, use of DES decreases the risk of restenosis compared with BMS (471,472). DES may be more appealing for unprotected left main PCI, given the rate and clinical consequences of restenosis in this location (473–475). The risk of stent thrombosis is higher in populations or lesion types excluded from RCTs of DES (e.g., STEMI, smaller arteries [<2.5 mm diameter], longer lesions, bifurcations) (210,465). Importantly, these features also predict both stent thrombosis (476) and restenosis in BMS (477). The greatest risk of stent thrombosis is within the first year, ranging from 0.7% to 2.0%, depending on patient and lesion complexity. Late stent thrombosis risk after 1 year with DES is observed at a rate of 0.2% to 0.4% per year (210,478).
Compared with balloon angioplasty, routine BMS implantation during primary PCI decreases risk for target-vessel revascularization and possibly reduces MI rates but does not reduce mortality rates (479). More recent primary PCI studies and meta-analyses have demonstrated lower restenosis rates without increased risk of adverse stent outcome with DES compared with BMS. Although stent thrombosis rates in trials of STEMI are higher than in trials of elective PCI, the rates of stent thrombosis are not higher with DES compared with BMS in STEMI (453,456–459).
The greatest risk for DES thrombosis is early discontinuation of DAPT (208,460–462). It is therefore important to determine that the patient will likely be able to tolerate and comply with DAPT before implantation of DES. Therefore, DES should not be used in the presence of financial barriers to continuing prolonged DAPT, social barriers that may limit patient compliance, or medical issues involving bleeding risks or the need for invasive or surgical procedures in the following year that would interrupt antiplatelet therapy. The need for use of long-term warfarin and the associated increased risk of bleeding with long-term “triple therapy” is also a consideration in deciding on DES versus BMS (480).
Patients implanted with most contemporary coronary stents can undergo magnetic resonance imaging (MRI) examination any time after implantation (481,482). The effect of the MRI examination on heating of the drug or polymer coating used in DES is unknown. There is no indication for antibiotic prophylaxis before dental or invasive procedures in patients with coronary stents (483).
5.4 Adjunctive Diagnostic Devices
5.4.1 FFR: Recommendation
1. FFR is reasonable to assess angiographic intermediate coronary lesions (50% to 70% diameter stenosis) and can be useful for guiding revascularization decisions in patients with SIHD (12,97,484–486). (Level of Evidence: A)
SeeOnline Data Supplement 23for additional data regarding FFR.
The limitations of coronary angiography for determination of lesion severity have been well described. Angiography may under- or overestimate lesion stenosis. Various physiologic measurements can be made in the catheterization laboratory, including coronary flow reserve and FFR. The correlation of ischemia on stress testing with FFR values of <0.75 has been established in numerous comparative studies with high sensitivity (88%), specificity (100%), positive predictive value (100%), and overall accuracy (93%) (487). The 5-year outcomes for patients with medical therapy based on an FFR >0.75 were superior compared with PCI in the DEFER (Deferral Versus Performance of Balloon Angioplasty in Patients Without Documented Ischemia) study (485). The FAME (Fractional Flow Reserve Versus Angiography for Multivessel Evaluation) study identified the benefit for deferring PCI in patients with multivessel disease and lesion FFR >0.80, with reduced rates of cardiac events at both 1 and 2 years (97,486). Whereas both FFR and IVUS have been used for assessment of intermediate angiographic stenosis with favorable outcomes, FFR may reduce the need for revascularization when compared with IVUS (488). Although IVUS is often considered in the assessment of equivocal left main stenosis, FFR may be similarly effective (484).
5.4.2 IVUS: Recommendations
1. IVUS is reasonable for the assessment of angiographically indeterminant left main CAD (489–491). (Level of Evidence: B)
2. IVUS and coronary angiography are reasonable 4 to 6 weeks and 1 year after cardiac transplantation to exclude donor CAD, detect rapidly progressive cardiac allograft vasculopathy, and provide prognostic information (492–494). (Level of Evidence: B)
3. IVUS is reasonable to determine the mechanism of stent restenosis (495). (Level of Evidence: C)
1. IVUS may be reasonable for the assessment of non–left main coronary arteries with angiographically intermediate coronary stenoses (50% to 70% diameter stenosis) (489,496,497). (Level of Evidence: B)
2. IVUS may be considered for guidance of coronary stent implantation, particularly in cases of left main coronary artery stenting (490,495,498). (Level of Evidence: B)
3. IVUS may be reasonable to determine the mechanism of stent thrombosis (495). (Level of Evidence: C)
CLASS III: NO BENEFIT
1. IVUS for routine lesion assessment is not recommended when revascularization with PCI or CABG is not being contemplated. (Level of Evidence: C)
IVUS provides a unique coronary artery assessment of lesion characteristics, minimal and maximal lumen diameters, cross-sectional area, and plaque area. Diagnostic uses for IVUS include the assessment of angiographic indeterminant coronary artery stenoses, determination of the mechanism of stent restenosis or thrombosis, and postcardiac transplantation surveillance of CAD (488,490–492,499). For left main coronary artery stenoses, a minimal lumen diameter of <2.8 mm or a minimal lumen area of <6 mm2 suggests a physiologically significant lesion for which patients may benefit from revascularization. A minimal lumen area >7.5 mm2 suggests that revascularization may be safely deferred (490). A minimal lumen area between 6 and 7.5 mm2 requires further physiological assessment, such as measurement of FFR (487,500). For non–left main stenoses, minimal lumen diameter >2.0 mm and minimal lumen area >4.0 mm2 correlate with low event rates (489). However, in smaller-diameter arteries (minimal lumen area <3.0 mm2), measurement of FFR may more accurately reflect a significant stenosis (488). Studies correlating IVUS measures with ischemia have not specified the size of coronary arteries for which such correlations are valid (488,489,497).
IVUS assessment after stent thrombosis may serve to identify stent underexpansion or malapposition (499). IVUS is superior to angiography in the early detection of the diffuse, immune-mediated, cardiac allograft vasculopathy; recommendations about the use of IVUS for this purpose were published in 2010 by the International Society of Heart and Lung Transplantation (492). Whereas IVUS has been an important research tool in interventional cardiology, most clinical studies of IVUS have not been able to demonstrate that its routine use results in a reduction of MACE or restenosis rates (498,501,502). IVUS has been inappropriately used in clinical practice to justify implanting stents in mildly diseased segments that may require no intervention (503).
5.4.3 Optical Coherence Tomography
Compared with IVUS, optical coherence tomography has greater resolution (10 to 20 micronmeter axially) but more limited depth of imaging (1 to 1.5 mm) (504,505). Unlike IVUS, optical coherence tomography requires that the artery be perfused with saline solution or crystalloid during image acquisition and therefore does not permit imaging of ostial lesions. Clinical studies have shown low optical coherence tomography complication rates (506,507), similar to those of IVUS (508). The excellent resolution of optical coherence tomography permits detailed in vivo 2-dimensional imaging of plaque morphological characteristics (e.g., calcification, lipid, thrombus, fibrous cap thickness, and plaque ulceration or rupture) (508–510) and evaluation of the arterial response to stent implantation (e.g., stent strut neointimal thickness and apposition) (511–513) and may be of value in clinical research. The appropriate role for optical coherence tomography in routine clinical decision making has not been established.
5.5 Adjunctive Therapeutic Devices
5.5.1 Coronary Atherectomy: Recommendations
1. Rotational atherectomy is reasonable for fibrotic or heavily calcified lesions that might not be crossed by a balloon catheter or adequately dilated before stent implantation (514,515). (Level of Evidence: C)
CLASS III: NO BENEFIT
1. Rotational atherectomy should not be performed routinely for de novo lesions or in-stent restenosis (516–519). (Level of Evidence: A)
Rotational atherectomy in RCTs was associated with higher rates of MACE at 30 days and no reduction in restenosis. It has a limited role in facilitating the dilation or stenting of lesions that cannot be crossed or expanded with PCI (520,521). Devices for directional coronary atherectomy are no longer marketed in the United States.
5.5.2 Thrombectomy: Recommendation
1. Aspiration thrombectomy is reasonable for patients undergoing primary PCI (522–524). (Level of Evidence: B)
The benefit of thrombectomy in patients with STEMI appears to be dependent on the type of thrombectomy technique used (522–526). No clinical benefit for routine rheolytic thrombectomy (AngioJet device, MEDRAD Interventional, Minneapolis, MN and Pittsburgh, PA) has been demonstrated in primary PCI (524–526). Two RCTs (522,523) and a meta-analysis (524) support the use of manual aspiration thrombectomy during primary PCI to improve microvascular reperfusion and decrease MACE. It is not known whether a strategy of selective thrombus aspiration in patients with a large thrombus burden might be equivalent to routine thrombus aspiration.
5.5.3 Laser Angioplasty: Recommendations
1. Laser angioplasty might be considered for fibrotic or moderately calcified lesions that cannot be crossed or dilated with conventional balloon angioplasty (527). (Level of Evidence: C)
CLASS III: NO BENEFIT
1. Laser angioplasty should not be used routinely during PCI (516,518,528). (Level of Evidence: A)
RCTs of laser angioplasty have not demonstrated improved clinical or angiographic PCI outcomes, although some practitioners think that laser angioplasty may be of use in the treatment of lesions that are difficult to dilate with balloon angioplasty (527).
5.5.4 Cutting Balloon Angioplasty: Recommendations
1. Cutting balloon angioplasty might be considered to avoid slippage-induced coronary artery trauma during PCI for in-stent restenosis or ostial lesions in side branches (529). (Level of Evidence: C)
CLASS III: NO BENEFIT
1. Cutting balloon angioplasty should not be performed routinely during PCI (516,529,530). (Level of Evidence: A)
Although some small, single-center trials have suggested that cutting balloon angioplasty was more efficacious than balloon angioplasty, it was not found to be safer or more effective in several large trials (516,529,531). When balloon dilation is required for in-stent restenosis, however, cutting balloons are less likely to slip and may offer a technical advantage over conventional balloons (529). Scoring balloons have been used by some cardiologists as an alternative to cutting balloons, but no RCTs have been reported (531).
5.5.5 Embolic Protection Devices: Recommendation
1. Embolic protection devices (EPDs) should be used during saphenous vein graft (SVG) PCI when technically feasible (532–535). (Level of Evidence: B)
The incidence of MACE doubles in SVG PCI compared with native-artery PCI (536). A distal balloon occlusion EPD decreased the 30-day composite outcome of death, MI, emergency CABG, or target-lesion revascularization (9.6% versus 16.5%) in the only RCT (532). Subsequent noninferiority comparisons have demonstrated similar benefit with proximal occlusion and distal filter EPDs, with benefit limited to reduction in periprocedural MI (534,535) (Section 5.10). Distal EPDs do not improve survival or reinfarction rates in patients undergoing native-artery PCI (524,537).
5.6 Percutaneous Hemodynamic Support Devices: Recommendation
1. Elective insertion of an appropriate hemodynamic support device as an adjunct to PCI may be reasonable in carefully selected high-risk patients. (Level of Evidence: C)
IABP counterpulsation is frequently used as an adjunct to PCI in hemodynamically unstable patients (538,539). In single-center series, the routine prophylactic use of IABP during PCI in high-risk patients was associated with lower mortality and fewer major complications compared with rescue use of IABP (540,541). In the only RCT in high-risk PCI patients (BCIS-1 [Balloon Pump-Assisted Coronary Intervention Study]) (542), there was no difference in the primary composite outcome between routine and provisional use of IABP. There were also no differences in major secondary endpoints except major procedural complications (e.g., prolonged hypotension, ventricular tachycardia/fibrillation, cardiopulmonary arrest), which were lower in the routine IABP group. Bleeding and access site complication rates tended to be higher in the routine IABP group. The “bailout” rate of IABP insertion in the provisional IABP group was 12%, mostly for procedural hypotension (542). A meta-analysis of IABP therapy in patients with STEMI did not show improved outcomes with the use of IABP (434).
The Impella Recover LP 2.5 System (Abiomed, Aachen, Germany/Danvers, Massachusetts) is a 12.5 Fr catheter that is inserted percutaneously through a 13 Fr femoral artery sheath and placed across the aortic valve into the left ventricle, through which a transaxial blood pump provides flows of up to 2.5 L/min. This has been used in patients with cardiogenic shock (543,544) as well as elective PCI (545). The hemodynamic effects of the Impella 2.5 have been studied in high-risk PCI patients, demonstrating beneficial LV unloading effect (decreased end-diastolic pressure and wall stress) with no change in global or systolic LV function (546). The PROTECT I (A Prospective Feasibility Trial Investigating the Use of the IMPELLA Recover LP 2.5 System in Patients Undergoing High-Risk PCI) trial in 20 patients undergoing high-risk PCI with the Impella 2.5 system concluded that this device was safe, easy to implant, and hemodynamically effective (547). The Europella Registry included 144 patients undergoing high-risk PCI and reported the safety, feasibility, and potential usefulness of the device and that RCTs were warranted (548). The randomized PROTECT II (A Prospective, Multicenter, Randomized Controlled Trial of the IMPELLA Recover LP 2.5 System Versus Intra Aortic Balloon Pump in Patients Undergoing Non Emergent High Risk PCI) trial, which was designed to demonstrate superiority of Impella over IABP in terms of 1-month adverse events, was halted for futility after interim analysis of study results (549).
The TandemHeart (CardiacAssist, Inc, Pittsburgh, PA) is a left atrial to aorta catheter-based system that includes a centrifugal blood pump providing flows of up to 4 L/min. This device uses a 21 Fr cannula percutaneously inserted into the femoral vein for transseptal access of the left atrium with a 15 Fr catheter placed in the contralateral femoral artery and positioned above the aortic bifurcation. An extracorporeal pump then returns oxygenated blood from the left atrium to the arterial system, thereby unloading the left ventricle (550,551). The hemodynamic effects have been studied in patients undergoing high-risk PCI (552). Several small studies have addressed the clinical efficacy of the TandemHeart in high-risk patients undergoing PCI (551,553–556). In a single-center report of 68 patients undergoing high-risk PCI using either TandemHeart or Impella Recover 2.5, success rates (>90%) and vascular complications (7%) were similar (553).
High-risk patients may include those undergoing unprotected left main or last-remaining-conduit PCI, those with severely depressed EF undergoing PCI of a vessel supplying a large territory, and/or those with cardiogenic shock. Patient risk, hemodynamic support, ease of application/removal, and operator and laboratory expertise are all factors involved in consideration of use of these devices. With devices that require large cannula insertion, the risk of vascular injury and related complications are important considerations regarding necessity and choice of device.
5.7 Interventional Pharmacotherapy
5.7.1 Procedural Sedation
The term conscious sedation is falling out of favor with the recognition that there is a spectrum of procedural sedation levels. Most patients undergoing PCI fall under the definition of either minimal sedation (anxiolysis) or moderate sedation (depressed consciousness with the ability to respond purposefully to verbal commands) (557). Nonetheless, an underlying principle of procedural sedation is that the physician should be prepared to manage one level of sedation deeper than the level intended. Thus, cardiologists should be cognizant of the principles of managing deep sedation (depressed consciousness without easy arousal that may require assistance in maintaining airway patency or spontaneous ventilation).
A full review of procedural sedation is beyond the scope of this document, but practice guidelines for sedation and analgesia by nonanesthesiologists, along with The Joint Commission standards, provides a reasonable framework. These guidelines outline several general principles (558,559). Before the procedure the patient should be assessed for predictors of difficult intubation or a history of prior difficult intubation. The patient should be monitored by someone dedicated to observing the level and effects of sedation. Level of consciousness, respiratory rate, blood pressure, cardiac rhythm, and oxygen saturation by pulse oximetry should be monitored. Available equipment should include a high-flow oxygen source, suction, airway management equipment, a defibrillator, resuscitation drugs, and reversal agents appropriate for the drugs being used. A free-flowing IV line should be established. Supplemental oxygen is usually administered, even in the absence of preexisting hypoxia, to provide a margin of safety.
Agents used for sedation are best given in incremental doses, allowing adequate time for the development and assessment of peak effect. The most commonly used agents are listed in Appendix 4F.
5.7.2 Oral Antiplatelet Therapy: Recommendations
1. Patients already taking daily aspirin therapy should take 81 mg to 325 mg before PCI (301–304). (Level of Evidence: B)
2. Patients not on aspirin therapy should be given nonenteric aspirin 325 mg before PCI (301,303,304). (Level of Evidence: B)
3. After PCI, use of aspirin should be continued indefinitely (560–563). (Level of Evidence: A)
4. A loading dose of a P2Y12 receptor inhibitor should be given to patients undergoing PCI with stenting (564–568) (Level of Evidence: A). Options include
5. The loading dose of clopidogrel for patients undergoing PCI after fibrinolytic therapy should be 300 mg within 24 hours and 600 mg more than 24 hours after receiving fibrinolytic therapy (565,569). (Level of Evidence: C)
6. Patients should be counseled on the need for and risks of DAPT before placement of intracoronary stents, especially DES, and alternative therapies should be pursued if patients are unwilling or unable to comply with the recommended duration of DAPT (208). (Level of Evidence: C)
7. The duration of P2Y12 inhibitor therapy after stent implantation should generally be as follows:
a. In patients receiving a stent (BMS or DES) during PCI for ACS, P2Y12 inhibitor therapy should be given for at least 12 months. Options include clopidogrel 75 mg daily (570), prasugrel 10 mg daily (567), and ticagrelor 90 mg twice daily (568). (Level of Evidence: B)
b. In patients receiving DES for a non-ACS indication, clopidogrel 75 mg daily should be given for at least 12 months if patients are not at high risk of bleeding (208,212,571). (Level of Evidence: B)
c. In patients receiving BMS for a non-ACS indication, clopidogrel should be given for a minimum of 1 month and ideally up to 12 months (unless the patient is at increased risk of bleeding; then it should be given for a minimum of 2 weeks) (208,572). (Level of Evidence: B)
1. After PCI, it is reasonable to use aspirin 81 mg per day in preference to higher maintenance doses (302,573–576). (Level of Evidence: B)
2. If the risk of morbidity from bleeding outweighs the anticipated benefit afforded by a recommended duration of P2Y12 inhibitor therapy after stent implantation, earlier discontinuation (e.g., <12 months) of P2Y12 inhibitor therapy is reasonable. (Level of Evidence: C)
1. Continuation of DAPT beyond 12 months may be considered in patients undergoing DES implantation (567,568). (Level of Evidence: C)
CLASS III: HARM
1. Prasugrel should not be administered to patients with a prior history of stroke or transient ischemic attack (567). (Level of Evidence: B)
Aspirin reduces the frequency of ischemic complications after PCI. Although the minimum effective aspirin dosage in the setting of PCI has not been established, aspirin 325 mg given at least 2 hours, and preferably 24 hours, before PCI is recommended (302,303), after which aspirin 81 mg daily should be continued indefinitely.
Several investigations have explored various loading doses of clopidogrel before or during PCI. Compared with a 300-mg loading dose, doses of either 600 mg or 900 mg achieve greater degrees of platelet inhibition with fewer low responders (577). A meta-analysis of 7 studies that included 25,383 patients undergoing PCI demonstrated that intensified loading of clopidogrel with 600 mg reduces the rate of MACE without an increase in major bleeding compared with 300 mg (578). Another study suggested that a 600-mg loading dose of clopidogrel is associated with improvements in procedural angiographic endpoints and 1-year clinical outcomes in patients with STEMI who undergo primary PCI compared with a 300-mg dose (579). There is no benefit with increasing the loading dose to 900 mg compared with 600 mg (577). Clopidogrel 75 mg daily should be given for a minimum of 4 weeks after balloon angioplasty or BMS implantation (a minimum of 2 weeks if increased bleeding risk is present) (580) and for at least 12 months after DES implantation (unless the risk of bleeding outweighs the anticipated benefit). Patients should be counseled on the need for and risks of DAPT before stent implantation, especially DES implantation, and alternative therapies pursued (BMS or balloon angioplasty) if they are unwilling or unable to comply with the recommended duration of DAPT.
The efficacy of clopidogrel pretreatment remains controversial. Although some studies have suggested that pretreatment with clopidogrel is associated with decreased platelet aggregation and a significantly lower incidence of periprocedural MI after elective PCI, others have suggested no benefit to pretreatment compared with administration of the drug in the catheterization laboratory (572,581,582).
When prasugrel was compared with clopidogrel in patients with ACS in TRITON–TIMI 38 (Trial to Assess Improvement in Therapeutic Outcomes by Optimizing Platelet Inhibition with Prasugrel–Thrombolysis In Myocardial Infarction), prasugrel was associated with a significant 2.2% reduction in absolute risk and a 19% reduction in relative risk in the composite endpoint of cardiovascular death, nonfatal MI, or nonfatal stroke, and a significant increase in the rate of TIMI major hemorrhage (1.8% versus 2.4%) (567). Prasugrel is contraindicated in patients with a history of transient ischemic attack or stroke. Patients weighing <60 kg have an increased risk of bleeding on the 10 mg daily maintenance dose. The package insert suggests that consideration should be given to lowering the maintenance dose to 5 mg daily, although the effectiveness and safety of the 5-mg dose has not been studied. Prasugrel is not recommended for patients >75 years of age because of the increased risk of fatal and intracranial bleeding and lack of benefit, except in patients with diabetes or a history of prior MI. Prasugrel should not be started in patients likely to undergo urgent CABG. Prasugrel has not been studied in elective PCI, and thus no recommendation can be made regarding its use in this clinical setting.
Ticagrelor reversibly binds the P2Y12 receptor. Unlike clopidogrel or prasugrel, ticagrelor is not a thienopyridine. It also does not require metabolic conversion to an active metabolite. Compared with clopidogrel in patients with ACS in the PLATO (Platelet Inhibition and Patient Outcomes) trial, ticagrelor was associated with a significant 1.9% reduction in absolute risk and a 16% reduction in relative risk in the primary composite endpoint of vascular death, nonfatal MI, or nonfatal stroke (568). Importantly, a significant reduction in vascular mortality and all-cause mortality was observed. Although CABG-related bleeding was not significantly increased with ticagrelor compared with clopidogrel, a significantly greater incidence of major bleeding was observed in patients not undergoing CABG. Ticagrelor was associated with higher rates of transient dyspnea and bradycardia compared with clopidogrel, although only a very small percentage of patients discontinued the study drug because of dyspnea. Based on post hoc analysis of the PLATO study, specifically the results in the U.S. patient cohort, a black box warning states that maintenance doses of aspirin above 100 mg reduce the effectiveness of ticagrelor and should be avoided. After any initial dose, ticagrelor should be used with aspirin 75 mg to 100 mg per day (583). Given the twice-daily dosing and reversible nature of the drug, patient compliance may be a particularly important issue to consider and emphasize. Ticagrelor has not been studied in elective PCI or in patients who received fibrinolytic therapy; thus, no recommendations about its use in these clinical settings can be made.
5.7.3 IV Antiplatelet Therapy: RecommendationsSTEMI
1. In patients undergoing primary PCI treated with UFH, it is reasonable to administer a GP IIb/IIIa inhibitor (abciximab, double-bolus eptifibatide, or high-bolus dose tirofiban), whether or not patients were pretreated with clopidogrel (584–590). (For GP IIb/IIIa inhibitor administration in patients not pretreated with clopidogrel, Level of Evidence: A; for GP IIb/IIIa inhibitor administration in patients pretreated with clopidogrel, Level of Evidence: C)
1. In patients undergoing primary PCI with abciximab, it may be reasonable to administer intracoronary abciximab (589,591–604). (Level of Evidence: B)
CLASS III: NO BENEFIT
1. Routine precatheterization laboratory (e.g., ambulance or emergency department) administration of GP IIb/IIIa inhibitors as part of an upstream strategy for patients with STEMI undergoing PCI is not beneficial (605–612). (Level of Evidence: B)
1. In UA/NSTEMI patients with high-risk features (e.g., elevated troponin level) not treated with bivalirudin and not adequately pretreated with clopidogrel, it is useful at the time of PCI to administer a GP IIb/IIIa inhibitor (abciximab, double-bolus eptifibatide, or high-bolus dose tirofiban) in patients treated with UFH (613–618). (Level of Evidence: A)
1. In UA/NSTEMI patients with high-risk features (e.g., elevated troponin level) treated with UFH and adequately pretreated with clopidogrel, it is reasonable at the time of PCI to administer a GP IIb/IIIa inhibitor (abciximab, double-bolus eptifibatide, or high-bolus dose tirofiban) (616,619). (Level of Evidence: B)
1. In patients undergoing elective PCI treated with UFH and not pretreated with clopidogrel, it is reasonable to administer a GP IIb/IIIa inhibitor (abciximab, double-bolus eptifibatide, or high-bolus dose tirofiban) (619–621). (Level of Evidence: B)
1. In patients undergoing elective PCI with stent implantation treated with UFH and adequately pretreated with clopidogrel, it might be reasonable to administer a GP IIb/IIIa inhibitor (abciximab, double-bolus eptifibatide, or high-bolus dose tirofiban) (619,622–624). (Level of Evidence: B)
SeeOnline Data Supplement 24for additional data regarding IV antiplatelet therapy.
In the era before DAPT, trials of adequately dosed GP IIb/IIIa inhibitors in patients undergoing balloon angioplasty and coronary stent implantation demonstrated a reduction in the incidence of composite ischemic events with GP IIb/IIIa treatment, primarily through a reduction of enzymatically defined MI (613,615,618,620,621). Earlier RCTs of GP IIb/IIIa inhibitors were generally conducted in patients treated with UFH. In some trials, use of GP IIb/IIIa inhibitors are associated with some increased bleeding risk, and trials of these agents have generally excluded patients at high risk of bleeding (e.g., coagulopathy) (584,587–589,613–618,620–626). Thus, recommendations about use of GP IIb/IIIa inhibitors are best construed as applying to those patients not at high risk of bleeding complications. Abciximab, double-bolus eptifibatide (180 mcg/kg bolus followed 10 minutes later by a second 180 mcg/kg bolus), and high-bolus dose tirofiban (25 mcg/kg) all result in a high degree of platelet inhibition (627–629), have been demonstrated to reduce ischemic complications in patients undergoing PCI (608,609,613,615,618–621), and appear to lead to comparable angiographic and clinical outcomes (630,631).
Trials of GP IIb/IIIa inhibitors in the setting of STEMI and primary PCI were conducted in the era before routine stenting and DAPT. The results of these and more recent trials, as well as several meta-analyses, have yielded mixed results (584–590). Therefore, it is reasonable to administer GP IIb/IIIa inhibitors in patients with STEMI undergoing PCI, although these agents cannot be definitively recommended as routine therapy. These agents might provide more benefit in selective use, such as in patients with large anterior MI and/or large thrombus burden. Trials of precatheterization laboratory (e.g., ambulance or emergency room) administered GP IIb/IIIa inhibitors in patients with STEMI undergoing PCI, with or without fibrinolytic therapy, have generally shown no clinical benefit, and GP IIb/IIIa inhibitor use in this setting may be associated with an increased risk of bleeding (605–610,612). Studies of intracoronary GP IIb/IIIa inhibitor administration (predominantly using abciximab) consist of several small RCTs, retrospective analyses, retrospective and prospective registries, cohort analyses, and case reports. Although most of these published studies have reported some benefit of intracoronary administration in terms of acute angiographic parameters, infarct size, left ventricle myocardial salvage, and composite clinical endpoints, several other studies have not detected any benefit with intracoronary administration (589,591–604).
Trials of GP IIb/IIIa inhibitors in patients with UA/NSTEMI undergoing PCI demonstrated reduced ischemic outcomes, particularly in those with high-risk features such as positive biomarkers. Most trials were conducted in a prior PCI era and without P2Y12 inhibitor pretreatment (613,615,618,632,633), although several trials have also demonstrated benefit in patients with high-risk features pretreated with clopidogrel (616,619). In most older studies of stable patients undergoing balloon angioplasty or coronary stenting, treatment with GP IIb/IIIa inhibitors resulted in a reduction of composite ischemic events, primarily enzymatically defined MI (613–618,620,621,634,635). More contemporary trials of patients pretreated with a thienopyridine have not demonstrated any benefit with GP IIb/IIIa inhibitor therapy in patients with stable symptoms undergoing elective PCI (619,622–624).
5.7.4 Anticoagulant Therapy
18.104.22.168 Use of Parenteral Anticoagulants During PCI: Recommendation
1. An anticoagulant should be administered to patients undergoing PCI. (Level of Evidence: C)
Anticoagulant therapy prevents thrombus formation at the site of arterial injury, on the coronary guidewire, and in the catheters used for PCI (8). With rare exceptions (636), all PCI studies have used some form of anticoagulant. It is the consensus of the writing committee that PCI be performed with the use of some form of anticoagulant therapy. Suggested dosing regimens of parenteral agents used in PCI are given in Table 12. Recommendations for antiplatelet and antithrombin pharmacotherapy in PCI are given in Table 13.
22.214.171.124 UFH: Recommendation
1. Administration of IV UFH is useful in patients undergoing PCI. (Level of Evidence: C)
As the only anticoagulant available for PCI for many years, UFH became the standard of care by default (8). The dose of UFH for PCI has been based on empiricism and experience from RCTs. Suggested UFH dosing regimens are given in Table 12. When UFH is used during PCI, most cardiologists assess the degree of anticoagulation by measuring the activated clotting time. Although measurements are useful to show that an anti-IIa anticoagulant has been given, the value of the activated clotting time in current practice has been questioned. Although studies in the balloon angioplasty era did demonstrate a relationship between activated clotting time levels and ischemic complications (653–655), more recent analyses from the coronary stent era have not found a clear relationship between activated clotting time and outcomes (349,656,657). There may, however, be a modest relation between bleeding and activated clotting time levels (349,657). In addition, not only are there differences between activated clotting time levels measured by Hemochron and HemoTec devices, but both devices have less than optimal precision (658). Thus, although traditional target activated clotting time levels are included in this document, the utility of measured activated clotting time levels in current practice should be considered uncertain.
Most cardiologists remove femoral sheaths when the activated clotting time falls to <150 to 180 seconds or when the activated partial thromboplastin time falls to <50 seconds. Full-dose anticoagulation is no longer used after successful PCI procedures. Almost all large clinical trials have enrolled patients who underwent transfemoral PCI, but recent small studies assessing the transradial approach have used similar doses of UFH (659) and similar activated clotting time target levels (660).
126.96.36.199 Enoxaparin: Recommendations
1. An additional dose of 0.3 mg/kg IV enoxaparin should be administered at the time of PCI to patients who have received fewer than 2 therapeutic subcutaneous doses (e.g., 1 mg/kg) or received the last subcutaneous enoxaparin dose 8 to 12 hours before PCI (649,661–664). (Level of Evidence: B)
1. Performance of PCI with enoxaparin may be reasonable in patients either treated with “upstream” subcutaneous enoxaparin for UA/NSTEMI or who have not received prior antithrombin therapy and are administered IV enoxaparin at the time of PCI (646–650). (Level of Evidence: B)
CLASS III: HARM
1. UFH should not be given to patients already receiving therapeutic subcutaneous enoxaparin (649,665). (Level of Evidence: B)
Trials of enoxaparin relevant to PCI include both studies in which patients with UA/NSTEMI were started on upstream subcutaneous enoxaparin therapy that was continued up to the time of PCI and trials in which patients who had received no prior antithrombin therapy were treated with IV enoxaparin at the time of PCI (646–650,661–663,666). In the SYNERGY (Superior Yield of the New strategy of Enoxaparin, Revascularization and Glycoprotein IIb/IIIa Inhibitors) trial, there was an increased incidence of bleeding in those treated with upstream enoxaparin, later attributed at least in part to the fact that some patients being treated with enoxaparin were also administered UFH at the time of PCI (so-called “stacking”) (649,665). Almost all patients undergoing elective PCI who are administered enoxaparin (0.5 mg/kg IV) will have a peak anti-Xa level >0.5 IU/mL (647). Most clinical studies have used a regimen of 0.5 to 0.75 mg IV (667). Several studies have used this regimen in elective patients and those with STEMI (646). Patients who have received multiple doses of subcutaneously administered enoxaparin who undergo PCI within 8 hours of the last subcutaneous dose generally have adequate degrees of anticoagulation to undergo PCI, but the degree of anticoagulation may diminish in the 8- to 12-hour period after the last subcutaneous dose. In such patients, as well as in patients who have received only 1 subcutaneous dose of enoxaparin, the addition of enoxaparin (0.3 mg/kg IV) at the time of PCI provides an additional degree of anticoagulation and has become standard practice (648,661–664). Patients who undergo PCI >12 hours after the last subcutaneous dose are usually treated with full-dose de novo anticoagulation using an established regimen (e.g., full-dose UFH or bivalirudin).
188.8.131.52 Bivalirudin and Argatroban: Recommendations
1. For patients undergoing PCI, bivalirudin is useful as an anticoagulant with or without prior treatment with UFH (625,637–645). (Level of Evidence: B)
2. For patients with heparin-induced thrombocytopenia, it is recommended that bivalirudin or argatroban be used to replace UFH (668,669). (Level of Evidence: B)
Bivalirudin is being increasingly used in clinical practice (670) as evidence emerges from clinical trials across the spectrum of CAD (638–644). In individual trials and meta-analyses, the use of bivalirudin has been associated with reduced bleeding compared with UFH plus a GP IIb/IIIa inhibitor, although concerns about ischemic events have emerged in individual studies (625,637–645). Longer-term follow-up of the major bivalirudin trials, however, suggests that small or nominal increases in ischemic events have not translated into long-term consequences and that treatment at or before the time of PCI with clopidogrel may mitigate any increased early ischemic risk (637–645). Thus, a treatment strategy of bivalirudin compared with heparin (or enoxaparin) plus GP IIb/IIIa inhibitor appears to lower the risk of bleeding complications. The lower bleeding rates associated with bivalirudin (compared with UFH plus a GP IIb/IIIa inhibitor) are mitigated when used concomitantly with a GP IIb/IIIa inhibitor (639). A strategy of use of provisional GP IIb/IIIa inhibitor in patients treated with bivalirudin is widely accepted (639,643,644).
In patients with heparin-induced thrombocytopenia (671,672), a direct-thrombin inhibitor (argatroban) has been approved as an alternative parenteral anticoagulant to be used during PCI (668). The use of bivalirudin for heparin-induced thrombocytopenia has been reported as well (669).
184.108.40.206 Fondaparinux: Recommendation
CLASS III: HARM
1. Fondaparinux should not be used as the sole anticoagulant to support PCI. An additional anticoagulant with anti-IIa activity should be administered because of the risk of catheter thrombosis (651,652). (Level of Evidence: C)
Fondaparinux, a pentasaccharide, is an indirect factor Xa inhibitor but has no effect on thrombin. On the basis of reports of catheter thrombosis when fondaparinux is used alone during primary PCI (651,652), the writing committee recommends that an anticoagulant with anti-IIa activity be used in patients undergoing PCI (651,652). One study suggested that clinical outcomes were better when fondaparinux was replaced during PCI by a standard dose of UFH (85 U/kg, 60 U/kg with GP IIb/IIIa inhibitors) rather than by a low dose (50 U/kg) (673).
5.7.5 No-Reflow Pharmacological Therapies: Recommendation
1. Administration of an intracoronary vasodilator (adenosine, calcium channel blocker, or nitroprusside) is reasonable to treat PCI-related no-reflow that occurs during primary or elective PCI (674–689). (Level of Evidence: B)
SeeOnline Data Supplement 25for additional data regarding no-reflow therapies.
No-reflow is a broad term used to describe 2 distinct entities. The first is “interventional no-reflow” attributed to vasospasm and downstream embolization of debris dislodged during PCI, usually in the setting of atherectomy, thrombus, or degenerated SVGs. The second entity is suboptimal reperfusion of an infarct artery, attributed to endothelial injury in addition to embolization and vasospasm. Angiographic no-reflow is the most obvious sequela of the same pathophysiology that produces abnormal TIMI frame counts and TIMI blush scores, so these measures are often used interchangeably. The principal clinical sequela of no-reflow is myonecrosis. Efforts to prevent no-reflow overlap with strategies to reduce MI size and prevent periprocedural MI.
In the setting of MI, several drugs have been shown to reduce the incidence of no-reflow. Evidence for a beneficial effect on no-reflow exists for abciximab, adenosine, nicorandil, and nitroprusside (674,675,680,682,683,685,687,688,690). However, their adoption into clinical practice has depended on their effect on hard clinical endpoints such as infarct size and mortality. These benefits, and consequentially the use of these agents, have been limited.
For interventional no-reflow, several therapies have proven effective after no-reflow has started. These include adenosine, calcium channel blockers, and nitroprusside (676,678,679,681,684,686,689,691). There are fewer data to support the use of epinephrine (692). No-reflow after rotational atherectomy was less common with nicorandil compared with verapamil infusions in 3 studies (693–695), and an infusion of nicorandil/adenosine during rotational atherectomy prevented no-reflow in 98% of patients (677). Trials of pre-PCI intracoronary verapamil, nicardipine, and adenosine have reported them to be safe but have not demonstrated reductions in post-PCI no-reflow (696–698). Mechanical devices to prevent interventional and myocardial infarct reperfusion no-reflow are also covered in Section 5.5.5.
5.8 PCI in Specific Anatomic Situations
5.8.1 CTOs: Recommendation
1. PCI of a CTO in patients with appropriate clinical indications and suitable anatomy is reasonable when performed by operators with appropriate expertise (699–703). (Level of Evidence: B)
SeeOnline Data Supplements 26 to 28for additional data regarding CTOs.
Approximately one third of patients with suspected CAD who undergo coronary angiography have ≥1 CTO (defined as occlusion of a duration >3 months) (704). Although stress-induced ischemia can be elicited in the majority of patients with CTO despite the presence of collaterals (706,707), only 8% to 15% of these patients undergo PCI (708,709). The disparity between the frequency of CTOs and percutaneous treatment underscores not only the technical and procedural complexities of this lesion subtype but also the clinical uncertainties regarding which patients benefit from CTO revascularization. Studies suggest that patients who undergo successful, rather than failed, recanalization of CTOs fare better in terms of symptom status and need for CABG (699), as well as LV function (710). However, the impact of successful CTO recanalization on long-term survival remains unsettled (701,711,712). The decision to try PCI for a CTO (versus continued medical therapy or surgical revascularization) requires an individualized risk-benefit analysis encompassing clinical, angiographic, and technical considerations. Consultation with a cardiothoracic surgeon and use of the Heart Team approach in cases of CTO in which a large territory is subtended and/or multivessel CAD is present are frequently done.
From a technical perspective, successful recanalization of CTOs has steadily increased over the years because of adoption of dedicated wires, novel techniques, and increased operator experience (702). In patients who undergo successful CTO recanalization, use of DES significantly reduces the need for repeated target-vessel revascularization, compared with BMS and balloon angioplasty, without compromising safety (703,713–719).
5.8.2 SVGs: Recommendations
1. EPDs should be used during SVG PCI when technically feasible (532–535). (Level of Evidence: B)
CLASS III: NO BENEFIT
1. Platelet GP IIb/IIIa inhibitors are not beneficial as adjunctive therapy during SVG PCI (212,571,720,721). (Level of Evidence: B)
CLASS III: HARM
1. PCI is not recommended for chronic SVG occlusions (722–724). (Level of Evidence: C)
SeeOnline Data Supplement 29for additional data regarding SVG.
Adverse cardiac event rates are doubled after SVG PCI compared with native-artery PCI (536). A distal balloon occlusion EPD decreased the 30-day composite outcome of death, MI, emergency CABG, or target-lesion revascularization (9.6% versus 16.5%) in the only RCT comparing embolic protection with no embolic protection (532). Subsequent noninferiority comparisons have demonstrated similar benefit with proximal occlusion and distal filter EPDs, with benefit limited to reduction in periprocedural MI (534,535). PCI in chronic SVG occlusion is associated with low success rates, high complication rates, and poor long-term patency rates (722,723). Restenosis and target-vessel revascularization rates are lower with DES compared with BMS, although mortality and stent thrombosis rates are similar (725). The use of covered stents is limited to the treatment of the uncommon complication of SVG perforation. Balloon angioplasty for distal SVG anastomotic stenoses has low restenosis rates (724), so stenting is commonly reserved at this location for suboptimal balloon angioplasty results or restenosis. Routine GP IIb/IIIa inhibitor therapy has not proven beneficial in SVG PCI (720). Fibrinolytic therapy is no longer used for thrombus-containing lesions, but rheolytic or manual aspiration thrombectomy is sometimes employed.
5.8.3 Bifurcation Lesions: Recommendations
1. Provisional side-branch stenting should be the initial approach in patients with bifurcation lesions when the side branch is not large and has only mild or moderate focal disease at the ostium (726–729). (Level of Evidence: A)
1. It is reasonable to use elective double stenting in patients with complex bifurcation morphology involving a large side branch where the risk of side-branch occlusion is high and the likelihood of successful side-branch reaccess is low (730–733). (Level of Evidence: B)
Side-branch occlusion or severe stenosis after stenting the main artery in coronary bifurcation PCI occurs in 8% to 80% of unselected patients (732,734). The frequency of side-branch occlusion is related to complex bifurcation morphology (severe and/or long side-branch ostial stenosis, large plaque burden in the side-branch ostium, and/or unfavorable side-branch angulation) (732,735,736). Side-branch occlusion after PCI is associated with Q-wave and non–Q-wave MI (734,735). Therefore, preservation of physiologic flow in the side branch after PCI is important (736). There are 2 bifurcation PCI strategies: provisional stenting (stenting the main vessel with additional balloon angioplasty or stenting of the side branch only in the case of an unsatisfactory result) and elective double stenting of the main vessel and the side branch. When there is an unsatisfactory result in the side branch from the provisional stent in the main branch, sometimes balloon angioplasty alone in the side branch will improve the result and stenting the side branch is not necessary. Some experts have suggested that using the side-branch balloon alone will distort the main branch stent and thus this always needs to be a kissing balloon inflation.
In patients with low-risk bifurcation lesions (minimal or moderate ostial side-branch disease [<50% diameter stenosis] of focal length [5 to 6 mm]), provisional stenting yields similar clinical outcome to elective double stenting, with lower incidence of periprocedural biomarker elevation (726–729). Conversely, in patients with high-risk bifurcations, elective double stenting is associated with a trend toward higher angiographic success rates, lower in-hospital MACE, and better long-term patency of the side branch compared with provisional stenting (193). Culotte, Crush, and T-stent techniques have been studied in RCTs (726–729,737). Use of DES yields better outcomes than BMS (738), and sirolimus-eluting stents yield better outcomes than paclitaxel-eluting stents (739–742). Clinical evidence supports the use of final kissing balloon inflation after elective double stenting (743).
5.8.4 Aorto-Ostial Stenoses: Recommendations
1. IVUS is reasonable for the assessment of angiographically indeterminant left main CAD (744,745). (Level of Evidence: B)
2. Use of DES is reasonable when PCI is indicated in patients with an aorto-ostial stenosis (746,747). (Level of Evidence: B)
Aorto-ostial stenoses of native coronary arteries (left main coronary artery and right coronary artery) are most commonly caused by atherosclerosis, but they can also occur in patients with congenital malformations, radiation exposure, vasculitides, and aortic valve replacement. The angiographic diagnosis of aorto-ostial disease is not always straightforward, especially in the ostial left main coronary artery, where eccentricity and angulation can be mistaken for stenosis (490,748). Aorto-ostial disease can be evaluated with IVUS (744,745); FFR (with IV adenosine) has also been used (484,749). The treatment of aorto-ostial stenoses with balloon angioplasty has been associated with lower procedural success rates, more frequent in-hospital complications, and a greater likelihood of late restenosis (750). Although atherectomy devices (directional atherectomy, rotational atherectomy, and excimer laser angioplasty) have improved acute angiographic results over balloon angioplasty, restenosis has remained a limitation (751). In patients with aorto-ostial stenoses undergoing PCI, use of DES has been shown to reduce restenosis compared with BMS (176,746,752).
5.8.5 Calcified Lesions: Recommendation
1. Rotational atherectomy is reasonable for fibrotic or heavily calcified lesions that might not be crossed by a balloon catheter or adequately dilated before stent implantation (514,515,520). (Level of Evidence: C)
The presence of coronary calcification is a marker for significant CAD and increased long-term mortality (753). Calcified coronary lesions are not a homogenous entity, and their response to PCI varies according to severity of calcification. Severely calcified lesions respond poorly to balloon angioplasty (230,754), and when stents are implanted in such lesions, an incomplete and asymmetrical stent expansion occurs in the majority of cases (755). Attempts to remedy the underexpanded stents with aggressive high-pressure balloon dilatation may result in coronary artery rupture (756). All the published prospective RCTs that evaluated the various catheter-based coronary interventional devices excluded patients with severely calcified lesions. Therefore, the evidence base for best PCI practices in patients with severely calcified lesions comes from nonrandomized single-arm studies. Among the various adjunct devices that are used to facilitate PCI in severely calcified lesions, only rotational atherectomy has been shown to have potential utility (514,757). Although rotational atherectomy increases the chances of angiographic success in severely calcified lesions, its use as a stand-alone device has not led to a reduction in restenosis (520,521,758). Several retrospective studies have shown that in patients with severely calcified lesions, the use of rotational atherectomy before implantation of BMS (514) or DES (515) is safe. Intermediate-term patency is more favorable with DES than BMS (759).
5.9 PCI in Specific Patient Populations
Several specific patient subsets with higher risks for PCI, and at times higher absolute clinical benefit, have traditionally been underrepresented in RCTs and are described below.
The elderly constitute a growing proportion of patients considered for PCI (760). In 1 series examining trends over a 25-year period, the proportion of patients undergoing PCI who were 75 to 84 years of age doubled, and those >85 years of age increased 5-fold (761). Age is one of the strongest predictors of mortality after PCI (762), and elderly patients present with a substantially higher clinical risk profile (760). Nonetheless, the angiographic success rates and clinical benefits of PCI in elderly patients are similar to younger patients (763). In fact, the absolute benefit is typically greater because of higher absolute risk of adverse outcomes in these patients (764). However, increased risks of complications such as major bleeding and stroke mandate careful consideration of the benefits and risks of PCI in elderly patients (373).
Patients with diabetes represent approximately one third of patients undergoing PCI in the United States. Restenosis, which had been a major limitation of PCI, is significantly reduced in patients with diabetes treated with DES compared with BMS (471). However, there are no definitive data from RCTs supporting different clinical outcomes for different types of DES (765), with a recent meta-analysis of 35 RCTs involving 3,852 patients with diabetes unable to find major differences between patients receiving sirolimus-eluting stents or paclitaxel-eluting stents (472). Numerous analyses and clinical studies have evaluated how the presence of diabetes may impact the clinical outcome of patients undergoing PCI and decisions about PCI or CABG (14,116,163,164,186). These studies and the approach to revascularization decisions in diabetes are addressed in Section 4.
Diabetes is an important risk factor for the development of contrast-induced AKI. Strategies to reduce the risk of contrast-induced AKI in patients with diabetes are discussed in Section 4.4.
Cardiovascular disease is the leading cause of death in women in the United States and Europe (766), and an estimated 35% of PCIs in the United States are performed in women (767,768). Women undergoing PCI usually have more risk factors (including hypertension, advanced age, elevated cholesterol, and more significant and diffuse CAD) compared with men (769). Women with STEMI are also less likely to receive early medical treatments and experience longer delays to reperfusion therapy (770,771). In subgroup analyses of clinical trials, use of DES appears to be similarly efficacious in women and men (772).
5.9.4 CKD: Recommendation
1. In patients undergoing PCI, the glomerular filtration rate should be estimated and the dosage of renally cleared medications should be adjusted (298–300). (Level of Evidence: B)
CKD is an independent risk factor for the development and progression of CAD (773,774), and is also associated with worse prognosis after MI or PCI (369,775). A glomerular filtration rate of <60 mL/min per 1.73 m2 of body surface area should be considered abnormal. Patients with CKD undergoing PCI have a higher risk of complications, including bleeding (776), AKI, and death (236,777), but CKD is not a strong predictor of restenosis after BMS or DES (778). Strategies to reduce the risk of contrast-induced AKI in patients with CKD are discussed in Section 4.4. Platelet dysfunction and overdosing of antiplatelet and antithrombin drugs (350) in patients with CKD contribute to the increased risk of bleeding. The Cockcroft-Gault formula is commonly used as a surrogate marker for estimating creatinine clearance, which in turn estimates glomerular filtration rate (298,299,779,780). Medications that require dosage adjustments in patients with CKD include eptifibatide, tirofiban, bivalirudin, enoxaparin, and fondaparinux (781).
5.9.5 Cardiac Allografts
Cardiac allograft vasculopathy is a major cause of death in cardiac transplant recipients after their first year of survival (782). In general, revascularization for cardiac allograft vasculopathy with PCI is only palliative, with no evidence supporting benefit in regard to long-term survival or avoidance of retransplantation. The restenosis rate after PCI in patients with cardiac allograft vasculopathy is high, although stent implantation reduces early and midterm restenosis compared with balloon angioplasty. DES have been shown to have a tendency to lower restenosis rates compared with BMS (783,784). Thus, many clinicians perform stenting with DES or BMS in cardiac transplant patients with discrete lesions who have an abnormal stress test or symptoms suggestive of myocardial ischemia.
5.10 Periprocedural MI Assessment: Recommendations
1. In patients who have signs or symptoms suggestive of MI during or after PCI or in asymptomatic patients with significant persistent angiographic complications (e.g., large side-branch occlusion, flow-limiting dissection, no-reflow phenomenon, or coronary thrombosis), creatine kinase-MB and/or troponin I or T should be measured. (Level of Evidence: C)
1. Routine measurement of cardiac biomarkers (creatine kinase-MB and/or troponin I or T) in all patients after PCI may be reasonable. (Level of Evidence: C)
Major events leading to ischemia or MI after PCI include acute closure, embolization and no-reflow, side-branch occlusion, and acute stent thrombosis. Issues surrounding the routine assessment of cardiac biomarkers after PCI are complex, especially given that the definition of PCI-related MI has evolved over the years and most events are asymptomatic. The most recent consensus definition of MI considers troponin elevations of 3 times the upper limit of normal as a PCI-related MI in patients with normal baseline levels; this is further classified as a type 4a MI (240). This definition is supported by studies with delayed-enhancement MRI confirming that there is irreversible injury in the myocardium associated with biomarker elevations and that the size of this injury correlates with the degree of elevation (785). Furthermore, a meta-analysis of 15 observational studies found that troponin elevations at any level were linked with worse in-hospital and long-term outcomes; elevations >3 times the upper limit of normal predicted even worse outcomes (242). Other observational data, however, have raised concerns about whether the relationship is causal (786,787). A recent study found creatinine kinase-MB to correlate better with MRI-detected MI than troponin level (788). Definitions of PCI-related MI are being reevaluated by the Task Force for the Redefinition of Myocardial Infarction. Although there may be value for individual operators and hospitals to routinely measure cardiac biomarkers to track rates of PCI-related MI, at present there are not compelling data to recommend this for all PCI procedures.
5.11 Vascular Closure Devices: Recommendations
1. Patients considered for vascular closure devices should undergo a femoral angiogram to ensure their anatomic suitability for deployment. (Level of Evidence: C)
1. The use of vascular closure devices is reasonable for the purposes of achieving faster hemostasis and earlier ambulation compared with the use of manual compression (257,789–791). (Level of Evidence: B)
CLASS III: NO BENEFIT
1. The routine use of vascular closure devices is not recommended for the purpose of decreasing vascular complications, including bleeding (256,257,789–792). (Level of Evidence: B)
SeeOnline Data Supplement 30for additional data regarding vascular closure devices.
Vascular (arteriotomy) closure devices have been extensively reviewed (790), most recently in a 2010 AHA scientific statement (257), which issued several formal recommendations. The results of 4 meta-analyses have found that vascular closure devices decrease time to hemostasis compared with manual compression but do not decrease vascular complications, bleeding complications, or the need for blood transfusions (256,789,791,793). Future studies of vascular closure devices need to be randomized, include “high-risk” patients and “high-risk” anatomy, use blinded endpoint adjudication as much as possible, use well-defined and comprehensive complication endpoints, and be adequately powered to detect clinically important endpoints, particularly bleeding and vascular complications.
6 Postprocedural Considerations
Postprocedural considerations in patients undergoing PCI are discussed below and summarized in Table 14. Some recommendations and text regarding DAPT in Section 5.7.2 are intentionally repeated in this section for reader ease of use.
6.1 Postprocedural Antiplatelet Therapy: Recommendations
1. After PCI, use of aspirin should be continued indefinitely (560–563). (Level of Evidence: A)
2. The duration of P2Y12 inhibitor therapy after stent implantation should generally be as follows:
b. In patients receiving DES for a non-ACS indication, clopidogrel 75 mg daily should be given for at least 12 months if the patient is not at high risk of bleeding (208,212,571). (Level of Evidence: B)
c. In patients receiving BMS for a non-ACS indication, clopidogrel should be given for a minimum of 1 month and ideally up to 12 months (unless the patient is at increased risk of bleeding; then it should be given for a minimum of 2 weeks) (572). (Level of Evidence: B)
3. Patients should be counseled on the importance of compliance with DAPT and that therapy should not be discontinued before discussion with their cardiologist (208). (Level of Evidence: C)
1. After PCI, it is reasonable to use aspirin 81 mg per day in preference to higher maintenance doses (302,573–576). (Level of Evidence: B)
2. If the risk of morbidity from bleeding outweighs the anticipated benefit afforded by a recommended duration of P2Y12 inhibitor therapy after stent implantation, earlier discontinuation (e.g., <12 months) of P2Y12 inhibitor therapy is reasonable. (Level of Evidence: C)
1. Continuation of clopidogrel, prasugrel, or ticagrelor beyond 12 months may be considered in patients undergoing placement of DES (567,568). (Level of Evidence: C)
Continued treatment with the combination of aspirin and a P2Y12 inhibitor antagonist after PCI appears to reduce MACE (570,572). On the basis of RCT protocols, secondary prevention measures, and expert consensus opinion, aspirin 81 mg daily should be given indefinitely after PCI.
Likewise, P2Y12 inhibitors should be given for a minimum of 1 month after BMS (minimum 2 weeks for patients at significant increased risk of bleeding) (580) and for 12 months after DES and ideally in all patients who are not at high risk of bleeding.
The 2009 STEMI/PCI guidelines update (10) listed the recommendation “if the risk of morbidity because of bleeding outweighs the anticipated benefit afforded by thienopyridine therapy, earlier discontinuation should be considered” as a Class I recommendation, although the language used, in part, was consistent with a Class IIa recommendation. To clarify the intent of the recommendation, as well as to acknowledge the inherent difficulties in weighing bleeding and stent thrombosis risks, the recommendation is designated a Class IIa recommendation, using the phrase “earlier discontinuation is reasonable.” Recommendations regarding P2Y12 inhibitor discontinuation before elective or urgent CABG are provided in the “2011 ACCF/AHA Guideline for Coronary Artery Bypass Graft Surgery” (824).
6.1.1 PPIs and Antiplatelet Therapy: Recommendations
1. PPIs should be used in patients with a history of prior gastrointestinal (GI) bleeding who require DAPT (794). (Level of Evidence: C)
1. Use of PPIs is reasonable in patients with an increased risk of GI bleeding (e.g., advanced age, concomitant use of warfarin, steroids, nonsteroidal anti-inflammatory drugs, Helicobacter pylori infection) who require DAPT (794). (Level of Evidence: C)
CLASS III: NO BENEFIT
1. Routine use of a PPI is not recommended for patients at low risk of GI bleeding, who have much less potential to benefit from prophylactic therapy (794). (Level ofEvidence: C)
SeeOnline Data Supplement 31for additional data regarding the clopidogrel–PPI interaction.
PPIs are often prescribed prophylactically when clopidogrel is started to prevent GI complications such as ulceration and bleeding due to DAPT (825). There is pharmacodynamic evidence that omeprazole interferes with clopidogrel metabolism (826,827), but there is no clear evidence implicating other PPIs. However, even with omeprazole, there are no convincing data supporting an important clinical drug–drug interaction (826). The FDA communication about an ongoing safety review of clopidogrel advises that healthcare providers avoid the use of clopidogrel in patients with impaired CYP2C19 function due to known genetic variation or drugs that inhibit CYP2C19 activity. The FDA notes that there is no evidence that other drugs that reduce stomach acid, such as histamine-2 receptor antagonists (except cimetidine) or antacids, interfere with clopidogrel responsiveness. The COGENT (Clopidogrel and the Optimization of Gastrointestinal Events) trial randomized patients with DAPT to clopidogrel and omeprazole or clopidogrel and placebo, and while there was no difference in cardiovascular events between the 2 groups, GI events were halved in those randomized to omeprazole (828). It is reasonable to carefully evaluate the indication for PPI therapy in patients treated with clopidogrel, based on the presence or absence of the risk factors discussed above (794). The need for GI protection increases with the number of risk factors for bleeding. Prior upper GI bleeding is the strongest and most consistent risk factor for GI bleeding on antiplatelet therapy. Patients with ACS and prior upper GI bleeding are at substantial cardiovascular risk, so DAPT with concomitant use of a PPI may provide the optimal balance of risk and benefit. It should be noted that PPIs, by decreasing adverse GI effects related to clopidogrel, might decrease patients' discontinuation of clopidogrel. In patients in whom there is a clear indication for PPI therapy, some clinicians may choose to use a PPI other than omeprazole.
6.1.2 Clopidogrel Genetic Testing: Recommendations
1. Genetic testing might be considered to identify whether a patient at high risk for poor clinical outcomes is predisposed to inadequate platelet inhibition with clopidogrel (829). (Level of Evidence: C)
2. When a patient predisposed to inadequate platelet inhibition with clopidogrel is identified by genetic testing, treatment with an alternate P2Y12 inhibitor (e.g., prasugrel or ticagrelor) might be considered (829). (Level of Evidence: C)
CLASS III: NO BENEFIT
1. The routine clinical use of genetic testing to screen patients treated with clopidogrel who are undergoing PCI is not recommended (829). (Level of Evidence: C)
On March 12, 2010, the FDA approved a new label for clopidogrel with a “boxed warning” about the diminished effectiveness of clopidogrel in patients with impaired ability to convert the drug into its active metabolite (829). Patients with decreased CYP2C19 function because of genetic polymorphisms metabolize clopidogrel poorly and have higher rates of cardiovascular events after ACS and PCI than patients with normal CYP2C19 function. The warning also notes that tests are available to identify patients with genetic polymorphisms and that alternative treatment strategies should be considered for patients who are poor metabolizers. The clopidogrel boxed warning leaves the issue of whether to perform CYP2C19 testing up to the individual physician. It does not specifically require genetic testing or other changes in evaluation or treatment and does not imply that there are solid evidence-based reasons for such actions. Rather, it serves to inform clinicians of genetic variations in response to clopidogrel and to emphasize that clinicians should use this knowledge to make decisions about how to treat individual patients. At the present time, the evidence base is insufficient to recommend routine genetic testing in patients undergoing PCI. There may be a potential role for genetic testing for patients undergoing elective high-risk PCI procedures (e.g., unprotected left main, bifurcating left main, or last patent coronary artery).
6.1.3 Platelet Function Testing: Recommendations
1. Platelet function testing may be considered in patients at high risk for poor clinical outcomes (829). (Level of Evidence: C)
2. In patients treated with clopidogrel with high platelet reactivity, alternative agents, such as prasugrel or ticagrelor, might be considered (829). (Level of Evidence: C)
CLASS III: NO BENEFIT
1. The routine clinical use of platelet function testing to screen patients treated with clopidogrel who are undergoing PCI is not recommended (829). (Level of Evidence: C)
Platelet function testing to tailor antiplatelet therapy has received considerable interest. The GRAVITAS (Gauging Responsiveness With A VerifyNow Assay-Impact On Thrombosis And Safety) trial and several other ongoing trials test the concept that tailoring antiplatelet therapy based on platelet responsiveness assessed in an ex vivo P2Y12 assay will improve cardiovascular outcomes (830). In GRAVITAS, treatment with high-dose clopidogrel for 6 months in patients with high platelet reactivity on standard-dose clopidogrel was not beneficial. At the present time, the evidence base is insufficient to recommend routine platelet function testing. The results of 2 ongoing trials (DANTE [Dual Antiplatelet Therapy Tailored on the Extent of Platelet Inhibition] and ARCTIC [Double Randomization of a Monitoring Adjusted Antiplatelet Treatment Versus a Common Antiplatelet Treatment for DES Implantation, and Interruption Versus Continuation of Double Antiplatelet Therapy, One Year After Stenting]) will provide further information on the issue (www.clinicaltrials.gov).
6.2 Stent Thrombosis
The majority of stent thrombosis occurs early (0 to 30 days after PCI). In broad clinical practice, the expected rate of early stent thrombosis is <1%, and beyond 30 days it is 0.2% to 0.6% per year (210,831). Acute stent thrombosis often presents as STEMI, and emergency revascularization is indicated. Acute stent thrombosis is associated with mortality rates of 20% to 45% (832). Survivors are also at risk of recurrent stent thrombosis (833).
Mechanical and pharmacological factors are the most frequent cause of acute stent thrombosis. After the usual measures to restore flow in the infarct-related artery, it is important to consider the etiology of stent thrombosis as it pertains to further therapy and avoidance of recurrence. IVUS may identify factors such as an undersized stent, incomplete stent apposition, residual stenosis, or dissection and can guide subsequent treatment. The most common cause of acute stent thrombosis is nonadherence to DAPT; however, resistance to aspirin or thienopyridines and prothrombotic states such as congenital or acquired thrombophilic states (malignancy) are additional risk factors (834,835).
Given the poor prognosis of stent thrombosis and the uncertainties surrounding treatment, the importance of prevention must be emphasized. This includes ensuring compliance with DAPT and adequate stent sizing and expansion (836).
6.3 Restenosis: Recommendations
1. Patients who develop clinical restenosis after balloon angioplasty should be treated with BMS or DES if anatomic factors are appropriate and if the patient is able to comply with and tolerate DAPT (837). (Level of Evidence: B)
2. Patients who develop clinical restenosis after BMS should be treated with DES if anatomic factors are appropriate and the patient is able to comply with and tolerate DAPT (838–840). (Level of Evidence: A)
1. IVUS is reasonable to determine the mechanism of stent restenosis (495). (Level of Evidence: C)
1. Patients who develop clinical restenosis after DES may be considered for repeat PCI with balloon angioplasty, BMS, or DES containing the same drug or an alternative antiproliferative drug if anatomic factors are appropriate and the patient is able to comply with and tolerate DAPT (495). (Level of Evidence: C)
6.3.1 Background and Incidence
After balloon angioplasty, mechanisms contributing to restenosis include smooth muscle cell migration and proliferation, platelet deposition, thrombus formation, elastic recoil, and negative arterial remodeling. Stents block elastic recoil and negative remodeling, and the predominant mechanism for restenosis after stent implantation is neointimal hyperplasia. Restenosis rates vary, depending on whether angiographic restenosis (defined as >50% diameter stenosis at follow-up angiography) or clinical restenosis (symptomatic and requiring target-lesion revascularization or target-vessel revascularization) is measured, as well as on patient characteristics, coronary anatomy considerations, and device type (balloon angioplasty, BMS, or DES). The incidence of angiographic restenosis rates for uncomplicated lesions treated in RCTs ranges from 32% to 42% after balloon angioplasty (463,464) and from 16% to 32% after BMS (463,464), and is generally <10% after DES (454,841). Less than half of patients with angiographic restenosis present with symptomatic, clinically relevant restenosis at 1-year follow-up, and a pooled analysis of 6,186 patients from 6 trials of BMS showed target-lesion revascularization was performed in 12% and target-vessel revascularization in 14% at 1 year (842,843). Patients with clinical restenosis typically present with recurrent exertional angina, but 5% to 10% of patients present with acute MI and 25% with UA (844,845).
Factors associated with an increased risk of restenosis in various models include clinical setting (STEMI, ACS, daily angina), patient characteristics (diabetes, age <55 to 60 years, prior PCI, male sex, multivessel CAD), lesion location (unprotected left main, SVG), and procedural characteristics (minimum stent diameter ≤2.5 mm, total stent length ≥40 mm) (778,846).
PCI strategies for treating restenosis after balloon angioplasty, BMS, and DES are reviewed in the following sections. In addition to repeat PCI, intensified medical therapy or CABG are often also reasonable strategies, dependent on initial treatment (e.g., balloon angioplasty, BMS), pattern of restenosis, likelihood of recurrent restenosis, ability to intensify medical therapy, suitability for CABG, and patient preference. Repeat PCI with BMS or DES is not appropriate if the patient is not able to comply with and tolerate DAPT.
6.3.2 Restenosis After Balloon Angioplasty
For clinical restenosis after balloon angioplasty, stent implantation is superior to repeat balloon angioplasty or atheroablation devices. The REST (REstenosis STent) study showed that target-lesion revascularization rates were 10% for stent-treated patients and 27% for balloon-treated patients (p=0.001) (837).
6.3.3 Restenosis After BMS
In-stent restenosis is classified according to these angiographic characteristics: Pattern I includes focal lesions ≤10 mm in length; Pattern II is in-stent restenosis >10 mm within the stent; Pattern III includes in-stent restenosis >10 mm extending outside the stent; and Pattern IV is totally occluded in-stent restenosis (847). Treatment of in-stent restenosis with balloon angioplasty, repeat BMS, or atheroablation devices for Patterns I to IV resulted in 1-year target-lesion revascularization rates of 19%, 35%, 50%, and 83%, respectively. For clinical restenosis after BMS, repeat stenting with DES is preferred. Studies have demonstrated lower recurrent restenosis rates with DES compared with BMS or vascular brachytherapy (495,838–840).
6.3.4 Restenosis After DES
Clinical restenosis after placement of DES is becoming increasingly common due to the large numbers of patients who have been treated with DES. The predominant angiographic pattern for DES in-stent restenosis is focal (≤10 mm in length). Several biologic, mechanical, and technical factors may contribute to DES in-stent restenosis, including drug resistance, hypersensitivity, stent underexpansion, stent strut fracture, nonuniform stent strut coverage, gap in stent coverage, and residual uncovered atherosclerotic lesion. IVUS might be considered to determine the cause for in-stent restenosis and help guide treatment strategy. Interventionists may treat focal DES restenosis with balloon angioplasty and treat nonfocal DES restenosis with BMS, CABG, or repeat DES with the same or an alternative antiproliferative drug (848,849). Small, observational cohort studies have demonstrated angiographic restenosis rates of 25% to 30% with repeat DES either with the same or an alternative drug (495,849,850). There are no RCTs, and the most appropriate treatment of restenosis of DES remains unknown.
6.4 Clinical Follow-Up
At the time of discharge, patients are instructed to contact their physician or seek immediate medical attention if symptoms recur. Most physicians will give the patient instructions on return to work and timing of return to full activities. The importance of strict compliance with aspirin and P2Y12 inhibitor therapy is ideally emphasized to the patient at the time of discharge and during follow-up visits.
Secondary prevention measures after PCI are an essential part of long-term therapy, reducing both future morbidity and mortality associated with CAD, and are discussed in Section 6.5. A follow-up visit after PCI is usually scheduled to assess the patient's clinical status, the patient's compliance with secondary prevention therapies, and the success of secondary prevention measures (e.g., blood pressure control, low-density lipoprotein levels, smoking cessation). Routine, periodic stress testing of asymptomatic patients is not considered part of standard patient follow-up.
6.4.1 Exercise Testing: Recommendations
1. In patients entering a formal cardiac rehabilitation program after PCI, treadmill exercise testing is reasonable. (Level of Evidence: C)
CLASS III: NO BENEFIT
1. Routine periodic stress testing of asymptomatic patients after PCI without specific clinical indications should not be performed (795). (Level of Evidence: C)
Treadmill exercise testing before cardiac rehabilitation provides information about peak exercise capacity and heart rate, helping to stratify patients for the level of supervision during training, and seems reasonable for this purpose (851); nuclear imaging to assess ischemia in this context usually adds little.
The role of exercise testing to evaluate restenosis is much less certain. Although the presence of symptoms may not be a reliable means of detecting restenosis, there is no evidence that the detection of silent restenosis leads to improved outcome (852,853). Routine testing of all patients after PCI will also lead to many false-positive tests, particularly in the era of DES. As restenosis rates decline from 30% to 10%, the false-positive rate of stress imaging increases from 37% to 77% (854). A recent analysis of a national health insurance claims database and accompanying editorial find that stress testing after PCI is likely overused and rarely leads to repeat revascularization (855,856). In summary, there is no proven benefit or indication for routine periodic stress testing in patients after PCI, and, thus, it is not indicated (8,851). In cases in which there is a clear clinical indication for stress testing in a patient after PCI, exercise ECG alone is an insensitive predictor of restenosis (857,858); therefore, stress imaging is the preferred stress test (8). In cases of recurrent angina after PCI in which the pretest likelihood of restenosis is high and repeat revascularization based on symptoms is likely indicated, most practitioners will proceed directly to cardiac catheterization rather than first obtain stress imaging.
6.4.2 Activity and Return to Work
The timing of return to physical activity depends on the presenting condition as well as previous functional status. For STEMI, for example, daily walking is encouraged immediately, and driving can begin within 1 week after uncomplicated MI if allowed by local motor vehicle laws (859). Sexual activity usually can be resumed within days, provided exercise tolerance is adequate, normally assessed by the ability to climb a flight of stairs (859). Similar recommendations have been issued for UA/NSTEMI (860). Patients with UA who have undergone successful revascularization and are otherwise doing well may return to physical activity on an accelerated schedule, usually within a few days (860).
Return to work is more complex. Return to work rates after MI range from 63% to 94% and are confounded by factors such as job satisfaction, financial stability, and company policies (861). The physical demands and degree of stress of a particular job require that recommendations be individualized. In the PAMI-2 (Primary Angioplasty in Myocardial Infarction) trial, patients were encouraged to return to work 2 weeks after primary PCI for STEMI, and no adverse events were reported (862). In the RITA (Randomized Intervention Treatment of Angina) trial, revascularization with PCI led to earlier return to work compared with CABG, and subsequent employment rates were associated with relief of angina (105). Many practitioners use graded exercise treadmill testing to determine the safety of activity and return to work by measuring the metabolic equivalent of task (MET) level achieved and comparing that level to energy levels required to perform different activities (863).
6.4.3 Cardiac Rehabilitation: Recommendation
1. Medically supervised exercise programs (cardiac rehabilitation) should be recommended to patients after PCI, particularly for moderate- to high-risk patients for whom supervised exercise training is warranted (796–804). (Level of Evidence: A)
Participation in cardiac rehabilitation is associated with significant reductions in all-cause mortality (OR: 0.80, 95% CI: 0.68 to 0.93) and cardiac mortality (796,797). Reports from community-based surveys, which in general enroll older and higher-risk patients than clinical trials, have confirmed that participation in comprehensive rehabilitation is independently associated with a reduction in recurrent MI and reduced mortality (799). Cardiac rehabilitation is also associated with improvements in exercise tolerance, cardiac symptoms, lipid levels, cigarette smoking cessation rates (in conjunction with a smoking cessation program), stress levels, improved medical regimen compliance, and improved psychosocial well-being (800). Cardiac rehabilitation is cost-effective as well (864). Physician referral may be the most powerful predictor of patient participation in a cardiac rehabilitation program (865).
6.5 Secondary Prevention
The treatment of the patient does not end with PCI; secondary prevention measures are a critical component of patient management. Important secondary prevention measures were presented in detail in the “2006 AHA/ACC Guidelines for Secondary Prevention for Patients With Coronary and Other Atherosclerotic Vascular Disease” (562) and have recently been updated in the “AHA/ACCF Secondary Prevention and Risk Reduction Therapy for Patients With Coronary and Other Atherosclerotic Vascular Disease: 2011 Update” (805). The reader is referred to this document for detailed discussions of secondary prevention. Among the important recommendations are the following:
• Lipid management with lifestyle modification (Class I; Level of Evidence: B) (805–807) and statin therapy are recommended. (Level of Evidence: A) (344,806,808–810,810a) An adequate statin dose should be employed which reduces low-density lipoprotein cholesterol to <100 mg/dL AND achieves at least a 30% lowering of low-density lipoprotein cholesterol. (Class I; Level of Evidence: C) (806–810,810a) It is reasonable to treat patients with statin therapy which lowers low-density lipoprotein cholesterol to <70 mg/dL in very high-risk⁎ patients. (Class IIa; Level of Evidence: C) (345,808–810,810a,811,812) Patients who have triglycerides ≥200 mg/dL should be treated with statins to lower non–high-density lipoprotein cholesterol to <130 mg/dL. (Class I; Level of Evidence: B) (344,809,810,866) In patients who are very high risk⁎ and have triglycerides ≥200 mg/dL, a non–high-density lipoprotein cholesterol goal of <100 mg/dL is reasonable. (Class IIa; Level of Evidence: C) (344,809,810,866)
• Blood pressure control with lifestyle modification (Class I; Level of Evidence: B) (813–817) and pharmacotherapy (Class I; Level of Evidence: A) (805,813,818,819), with the goal of blood pressure <140/90 mm Hg.
• Diabetes management (e.g., lifestyle modification and pharmacotherapy), coordinated with the patient's primary care physician and/or endocrinologist. (Class I; Level of Evidence: C) (805)
• Advising patients on the need for complete smoking cessation. (Class I; Level of Evidence: A) (805,820–823)
7 Quality and Performance Considerations
7.1 Quality and Performance: Recommendations
1. Every PCI program should operate a quality-improvement program that routinely 1) reviews quality and outcomes of the entire program; 2) reviews results of individual operators; 3) includes risk adjustment; 4) provides peer review of difficult or complicated cases; and 5) performs random case reviews. (Level of Evidence: C)
2. Every PCI program should participate in a regional or national PCI registry for the purpose of benchmarking its outcomes against current national norms. (Level of Evidence: C)
PCI quality and performance considerations are defined by attributes related to structure, processes, and risk-adjusted outcomes. Structural attributes include elements such as equipment, supplies, staffing, institutional and operator-level volumes, and the availability of electronic medical records. Processes include strategies for the appropriate patient, protocols for pre- and postprocedural care, appropriate procedural execution and management of complications, and participation in databases and registries for benchmarking performance of the program and individual operator. Risk-adjusted outcomes are the end result of these structures and processes of care, and when available are more reliable measures of quality than the institutional and individual operator volumes discussed in Section 7.4.
PCI process and outcomes assessments can be used for internal quality-improvement efforts and public reporting. Public reporting of institutional risk-adjusted outcomes is becoming more common. Although operator-level outcomes can be assessed and risk adjusted, the results are much less reliable due to lack of statistical power resulting from lower volumes. Any public reporting must use statistical methods that meet the high criteria established by the AHA Work Group (867).
The cognitive knowledge and technical skill required to perform PCI continue to grow. Details on the training required for interventional cardiology are found in the most recent ACCF Core Cardiology Training Statement (868).
7.3 Certification and Maintenance of Certification: Recommendation
1. It is reasonable for all physicians who perform PCI to participate in the American Board of Internal Medicine interventional cardiology board certification and maintenance of certification program. (Level of Evidence: C)
The American Board of Internal Medicine established interventional cardiology board certification in 1999 as an “added qualification” to the cardiovascular disease board certification. Since 1990 all certificates from the American Board of Internal Medicine are time limited for a 10-year period and require all diplomats to participate in maintenance of certification to maintain their board-certified status. Maintenance of certification in interventional cardiology requires physicians to document a minimum of 150 interventional cases over the 2 years before expiration of the current certification, complete self-assessment modules of their medical knowledge, participate in practice-based quality-improvement activities, and pass a secure, knowledge-based examination (869–871). For those who cannot meet the case volume requirement, an alternative option is to submit a log of 25 consecutive cases including patient characteristics and procedural outcomes. The maintenance of certification process is likely to change, as the American Board of Internal Medicine intends to evolve maintenance of certification from an episodic event that occurs once every 10 years to a more continuous process of continuous professional development.
7.4 Operator and Institutional Competency and Volume: Recommendations
1. Elective/urgent PCI should be performed by operators with an acceptable annual volume (≥75 procedures) at high-volume centers (>400 procedures) with on-site cardiac surgery (872,873). (Level of Evidence: C)
2. Elective/urgent PCI should be performed by operators and institutions whose current risk-adjusted outcomes statistics are comparable to those reported in contemporary national data registries. (Level of Evidence: C)
3. Primary PCI for STEMI should be performed by experienced operators who perform more than 75 elective PCI procedures per year and, ideally, at least 11 PCI procedures for STEMI per year. Ideally, these procedures should be performed in institutions that perform more than 400 elective PCIs per year and more than 36 primary PCI procedures for STEMI per year (872,874–877). (Level of Evidence: C)
1. It is reasonable that operators with acceptable volume (≥75 PCI procedures per year) perform elective/urgent PCI at low-volume centers (200 to 400 PCI procedures per year) with on-site cardiac surgery (872). (Level of Evidence: C)
2. It is reasonable that low-volume operators (<75 PCI procedures per year) perform elective/urgent PCI at high-volume centers (>400 PCI procedures per year) with on-site cardiac surgery. Ideally, operators with an annual procedure volume of fewer than 75 procedures per year should only work at institutions with an activity level of more than 600 procedures per year. Operators who perform fewer than 75 procedures per year should develop a defined mentoring relationship with a highly experienced operator who has an annual procedural volume of at least 150 procedures per year. (Level of Evidence: C)
1. The benefit of primary PCI for STEMI patients eligible for fibrinolysis when performed by an operator who performs fewer than 75 procedures per year (<11 PCIs for STEMI per year) is not well established. (Level of Evidence: C)
CLASS III: NO BENEFIT
1. It is not recommended that elective/urgent PCI be performed by low-volume operators (<75 procedures per year) at low-volume centers (200 to 400 procedures per year) with or without on-site cardiac surgery. An institution with a volume of fewer than 200 procedures per year, unless in a region that is underserved because of geography, should carefully consider whether it should continue to offer this service (872). (Level of Evidence: C)
Older observational evidence supported a volume-outcome relationship in PCI at both the institutional and operator level (873). However, this relationship is complicated and may be inconsistent across low-volume institutions or operators. More recent data on primary PCI suggest that operator experience may modify the volume-outcome relationship at the institutional level (876,878). Risk-adjusted outcomes remain preferable to institutional and individual operator volumes as quality measures.
Operator and hospital volume recommendations have been carried over from the 2005 PCI guideline. However, the writing committee recognizes that these volume recommendations are controversial. In addition, after extensive review of all relevant data, the writing committee believes that the LOE in support of all the above recommendations is best categorized as LOE C rather than LOE B as it has been in prior guidelines for some recommendations. We encourage the ACCF/AHA/ACP Clinical Competence and Training writing group for PCI and other expert writing groups to review this issue so that new recommendations can be considered by the next PCI guideline writing committee.
7.5 Participation in ACC NCDR or National Quality Database
Assessment of PCI quality and outcomes is important both at the level of the entire program and at the level of the individual physician. This requires collection of clinical and procedural data for PCI that allows regular comparison of risk-adjusted outcomes and complications with national benchmarks. The ACC NCDR CathPCI Registry is an example of a national registry to fulfill the goals of assessing and benchmarking quality and outcomes.
8 Future Challenges
Although this latest guideline reflects significant advancements in the field of PCI, there remain future challenges to the formulation and updating of guidelines for PCI. The proliferation of studies comparing the many newer drugs and devices with older therapies (or other newer therapies), often using different or novel study endpoints, endpoint definitions, and noninferiority designs, pose increasing challenges to objectively evaluating newer therapies and generating recommendations for their use. Numerous potential advances in the field of PCI, including intracoronary stem cell infusions for chronic and acute ischemic heart disease, designer drugs, novel intracoronary imaging technologies such as optical coherence tomography and virtual histology, new stent composition and designs (e.g., drug-eluting, biodegradable, bifurcation), and drug-eluting balloons were considered for formal evaluation by the current writing committee, but it was thought that there were insufficient data at present to formulate any formal recommendations on these topics. These and other emerging technologies and treatments will need to be addressed in future PCI guidelines.
Finally, with this proliferation of new technology, the amount of data generated in the evaluation of these potential therapeutic advances will grow dramatically, adding significant challenges to future guideline generations. Of note, the Web site www.clinicaltrials.gov currently lists several hundred PCI-related clinical trials.
American College of Cardiology Foundation
David R. Holmes, Jr., MD, FACC, President
John C. Lewin, MD, Chief Executive Officer
Janet Wright, MD, FACC, Senior Vice President, Science and Quality
Charlene May, Senior Director, Science and Clinical Policy
Erin A. Barrett, MPS, Senior Specialist, Science and Clinical Policy
American College of Cardiology Foundation/American Heart Association
Lisa Bradfield, CAE, Director, Science and Clinical Policy
Sue Keller, BSN, MPH, Senior Specialist, Evidence-Based Medicine
Jesse M. Welsh, Specialist, Science and Clinical Policy
Debjani Mukherjee, MPH, Associate Director, Evidence-Based Medicine
American Heart Association
Ralph L. Sacco, MS, MD, FAAN, FAHA, President
Nancy Brown, Chief Executive Officer
Rose Marie Robertson, MD, FAHA, Chief Science Officer
Gayle R. Whitman, PhD, RN, FAHA, FAAN, Senior Vice President, Office of Science Operations
Mark D. Stewart, MPH, Science and Medicine Advisor, Office of Science and Medicine
Appendix 1. Author Relationships With Industry And Other Entities (Relevant)—2011 ACCF/AHA/SCAI Guideline for Percutaneous Coronary Intervention
|Committee Member||Employer/Title||Consultant||Speaker's Bureau||Ownership/ Partnership/ Principal||Personal Research||Institutional, Organizational, or Other Financial Benefit||Expert Witness||Voting Recusals by Section Number⁎|
|Glenn N. Levine (Chair)||Baylor College of Medicine—Professor of Medicine; Director, Cardiac Care Unit||None||None||None||None||None||None||None|
|Eric R. Bates (Vice Chair)||University of Michigan—Professor of Medicine||None||None||None||None||None||5.7.2|
|James C. Blankenship (Vice Chair)||Geisinger Medical Center—Director of Cardiology and Cardiac Catheterization Laboratories||None||None||None||None||None||2.1|
|Steven R. Bailey||University of Texas Medical Center—Professor of Medicine and Radiology||None||None||None||None||5.4.1|
|John A. Bittl||Munroe Heart—Interventional Cardiologist||None||None||None||None||None||None||None|
|Bojan Cercek||Cedars-Sinai Medical Center—Director, Coronary Care Unit||None||None||None||None||None||None||None|
|Charles E. Chambers||Penn State Milton S. Hershey Medical Center—Professor of Medicine and Radiology||None||None||None||None||None||None||None|
|Stephen G. Ellis||Cleveland Clinic Foundation—Section Head, Invasive and Interventional Cardiology||None||None||None||None||2.2|
|Robert A. Guyton||Emory Clinic, Inc.—Professor and Chief, Division of Cardiothoracic Surgery||None||None||None||None||None||2.1|
|Steven M. Hollenberg||Cooper University Hospital—Director, Coronary Care Unit||None||None||None||None||None||220.127.116.11|
|Umesh N. Khot||CV Research Innovations, LLC—President/CEO||None||None||None||None||None||4.6|
|Richard A. Lange||University of Texas Health Science Center at San Antonio—Professor of Medicine||None||None||None||None||None||None||None|
|Laura Mauri||Brigham and Women's Hospital—Associate Professor of Medicine, Harvard Medical School||None||None||2.9.7|
|Roxana Mehran||Columbia University Medical Center—Associate Professor of Medicine; Director, Data Coordinating Analysis Center||None||None||None||None||None||4.7|
|Issam D. Moussa||Mayo Clinic—Professor of Medicine; Chair, Division of Cardiovascular Diseases||None||None||None||None||None||None||None|
|Debabrata Mukherjee||Texas Tech University—Chief, Cardiovascular Medicine||None||None||None||None||None||None||None|
|Brahmajee K. Nallamothu||University of Michigan—Assistant Professor of Medicine||None||None||None||None||None||None||None|
|Henry H. Ting||Mayo Clinic—Professor of Medicine; Assistant Dean for Quality||None||None||None||None||None||None||None|
This table represents the relationships of committee members with industry and other entities that were determined to be relevant to this document. These relationships were reviewed and updated in conjunction with all meetings and/or conference calls of the writing committee during the document development process. The table does not necessarily reflect relationships with industry at the time of publication. A person is deemed to have a significant interest in a business if the interest represents ownership of ≥5% of the voting stock or share of the business entity, or ownership of ≥$10,000 of the fair market value of the business entity; or if funds received by the person from the business entity exceed 5% of the person's gross income for the previous year. Relationships that exist with no financial benefit are also included for the purpose of transparency. Relationships in this table are modest unless otherwise noted.
According to the ACCF/AHA, a person has a relevant relationship IF: a) The relationship or interest relates to the same or similar subject matter, intellectual property or asset, topic, or issue addressed in the document; or b) The company/entity (with whom the relationship exists) makes a drug, drug class, or device addressed in the document, or makes a competing drug or device addressed in the document; or c) The person or a member of the person's household has a reasonable potential for financial, professional, or other personal gain or loss as a result of the issues/content addressed in the document.
↵⁎ Writing committee members are required to recuse themselves from voting on sections to which their specific relationships with industry and other entities may apply.
↵† Significant relationship.
Appendix 2. Reviewer Relationships With Industry and Other Entities (Relevant)—2011 ACCF/AHA/SCAI Guideline for Percutaneous Coronary Intervention
|Peer Reviewer||Representation||Consultant||Speaker's Bureau||Ownership/ Partnership/ Principal||Personal Research||Institutional, Organizational, or Other Financial Benefit||Expert Witness|
|Deepak L. Bhatt||Official Reviewer—AHA||None||None||None||None||None|
|Mauricio G. Cohen||Official Reviewer—AHA||None||None||None|
|John P. Erwin III||Official Reviewer—ACCF/AHA Task Force on Performance Measures||None||None||None||None||None||None|
|Kirk Garratt||Official Reviewer—SCAI||None||None||None|
|Steven L. Goldberg||Official Reviewer—SCAI||None||None||None|
|Alice K. Jacobs||Official Reviewer—ACCF/AHA Task Force on Practice Guidelines||None||None||None||None|
|G. B. John Mancini||Official Reviewer—ACCF Board of Governors||None||None||None||None|
|W. Douglas Weaver||Official Reviewer—ACCF Board of Trustees||None||None||None||None||None|
|Thomas M. Bashore||Content Reviewer||None||None||None||None||None||None|
|Christopher E. Buller||Content Reviewer||None||None||None||None|
|James A. Burke||Content Reviewer— ACCF Interventional Scientific Council||None||None||None||None||None||None|
|John G. Byrne||Content Reviewer—ACCF Surgeons' Scientific Council||None||>None||None||None||None|
|T. Bruce Ferguson||Content Reviewer—ACCF Surgeons' Scientific Council||None||None||None||None||None|
|Victor A. Ferrari||Content Reviewer||None||None||None||None||None|
|John G. Harold||Content Reviewer||None||None||None||None||None||None|
|Biswajit Kar||Content Reviewer||None||None||None||None|
|Morton J. Kern||Content Reviewer||None||None||None||None|
|Spencer B. King III||Content Reviewer||None||None||None||None|
|Frederick G. Kushner||Content Reviewer||None||None||None||None||None|
|David J. Maron||Content Reviewer||None||None||None||None|
|Douglass A. Morrison||Content Reviewer||None||None||None||None||None||None|
|Thomas C. Piemonte||Content Reviewer—ACCF Board of Governors||None||None||None||None||None|
|Peter K. Smith||Content Reviewer||None||None||None||None||None|
|Sidney C. Smith||Content Reviewer||None||None||None||None||None||None|
|Richard W. Snyder||Content Reviewer—ACCF Board of Governors||None||None||None||None||None|
|Patrick L. Whitlow||Content Reviewer||None||None||None||None|
|David O. Williams||Content Reviewer||None||None||None||None||None|
|R. Scott Wright||Content Reviewer||None||None||None||None||None|
This table represents the relationships of reviewers with industry and other entities that were disclosed at the time of peer review and determined to be relevant. It does not necessarily reflect relationships with industry at the time of publication. A person is deemed to have a significant interest in a business if the interest represents ownership of ≥5% of the voting stock or share of the business entity, or ownership of ≥$10,000 of the fair market value of the business entity; or if funds received by the person from the business entity exceed 5% of the person's gross income for the previous year. A relationship is considered to be modest if it is less than significant under the preceding definition. Relationships that exist with no financial benefit are also included for the purpose of transparency. Relationships in this table are modest unless otherwise noted. Names are listed in alphabetical order within each category of review.
According to the ACCF/AHA, a person has a relevant relationship IF: a) The relationship or interest relates to the same or similar subject matter, intellectual property or asset, topic, or issue addressed in the document; or b) The company/entity (with whom the relationship exists) makes a drug, drug class, or device addressed in the document, or makes a competing drug or device addressed in the document; or c) The person or a member of the person's household has a reasonable potential for financial, professional, or other personal gain or loss as a result of the issues/content addressed in the document.
ACCF indicates American College of Cardiology Foundation; AHA, American Heart Association; DSMB, data safety and monitoring board; NHLBI, National Heart, Lung, and Blood Institute; NIH, National Institutes of Health; SCAI, Society for Cardiovascular Angiography and Interventions; and TIMI, Thrombolysis In Myocardial Infarction.
↵⁎ Significant relationship.
↵† No financial benefit.
Appendix 3. Abbreviation List
Appendix 4. Additional Tables/Figures
↵⁎ Writing committee members are required to recuse themselves from voting on sections to which their specific relationships with industry and other entities may apply; see Appendix 1 for recusal information.
↵† ACCF/AHA Representative.
↵‡ SCAI Representative.
↵§ Joint Revascularization Section Author.
↵∥ ACCF/AHA Task Force on Practice Guidelines Liaison.
↵¶ ACCF/AHA Task Force on Performance Measures Liaison.
↵⁎ Presence of established cardiovascular disease plus 1) multiple major risk factors (especially diabetes), 2) severe and poorly controlled risk factors (especially continued cigarette smoking), 3) multiple risk factors of the metabolic syndrome (especially high triglycerides ≥200 mg/dL plus non–high-density lipoprotein cholesterol ≥130 mg/dL with low high-density lipoprotein cholesterol [<40 mg/dL]), and 4) acute coronary syndromes.
This document was approved by the American College of Cardiology Foundation Board of Trustees and the American Heart Association Science Advisory and Coordinating Committee in July 2011, and the Society for Cardiovascular Angiography and Interventions in August 2011.
The American College of Cardiology Foundation requests that this document be cited as follows: Levine GN, Bates ER, Blankenship JC, Bailey SR, Bittl JA, Cercek B, Chambers CE, Ellis SG, Guyton RA, Hollenberg SM, Khot UN, Lange RA, Mauri L, Mehran R, Moussa ID, Mukherjee D, Nallamothu BK, Ting HH. 2011 ACCF/AHA/SCAI guideline for percutaneous coronary intervention: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines and the Society for Cardiovascular Angiography and Interventions. J Am Coll Cardiol 2011;58:e44–122.
This article is copublished in Circulation and Catheterization and Cardiovascular Interventions.
Copies: This document is available on the World Wide Web sites of the American College of Cardiology (www.cardiosource.org), the American Heart Association (my.americanheart.org), and the Society for Cardiovascular Angiography and Interventions (www.scai.org). For copies of this document, please contact Elsevier Inc. Reprint Department, fax (212) 633-3820, e-mail .
Permissions: Multiple copies, modification, alteration, enhancement, and/or distribution of this document are not permitted without the express permission of the American College of Cardiology Foundation. Please contact.
- American College of Cardiology Foundation and the American Heart Association, Inc.
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