Table 2

Baseline Demographic and Angiographic Characteristics and Coronary Angioplasty Outcomes in 437 High Risk Patients Randomized to Intraaortic Balloon Counterpulsation Versus Conservative Care

IABP (n = 211)No IABP (n = 226)p Value
Demographic features
 Age (yr)64.7 ± 11.963.7 ± 13.00.69
 Female gender (%)25.124.80.93
 Hypertension (%)54.855.70.86
 Hypercholesterolemia (%)37.235.90.78
 Diabetes mellitus (%)21.314.60.07
 Current cigarette smoking (%)33.530.80.55
 Prior peripheral vascular disease (%)5.03.20.34
 Prior MI (%)21.421.70.94
 Prior CABG (%)7.55.90.52
 Prior CHF (%)3.53.20.86
 Admission Killip class ≥2 (%)21.722.20.95
 Admission HR (beats/min)79 ± 1781 ± 360.51
 Admission SBP (mm Hg)130 ± 26129 ± 250.52
 Time from symptom onset to hospital arrival (min)149 ± 139146 ± 1400.83
 Time from symptom onset to angiography (min)262 ± 167257 ± 1540.54
Angiographic features (%)
 1 VD (%)43.651.8
 2 VD (%)24.220.80.23
 3 VD (%)32.227.4
Acute LVEF (%)49.4 ± 12.550.1 ± 11.30.58
IRA
 LAD (%)52.349.8
 LCx (%)11.310.10.67
 RCA (%)36.440.1
Initial infarct lesion stenosis (%)96 ± 897 ± 70.47
Initial TIMI flow grade 0–180.681.10.89
High risk qualifying features
 Age >70 yr35.639.40.41
 LVEF ≤45%58.651.80.16
 3 VD32.227.40.29
 Saphenous vein graft angioplasty4.33.60.70
 Refractory ventricular arrhythmias7.16.80.86
 Suboptimal angioplasty result13.314.20.77
Outcome of primary PTCA
 Post-PTCA infarct lesion stenosis (%)29 ± 1429 ± 140.93
 PTCA successful (%)97.396.20.55
 TIMI grade 3 flow restored (%)92.691.20.78

Data presented are mean value ± SD or percent of patients. CABG = coronary artery bypass graft surgery; CHF = congestive heart failure; HR = heart rate; IABP = intraaortic balloon pump counterpulsation; IRA = infarct-related artery; LAD = left anterior descending coronary artery; LCx = left circumflex coronary artery; LVEF = left ventricular ejection fraction; PTCA = percutaneous transluminal coronary angioplasty; RCA = right coronary artery; SBP = systolic blood pressure; TIMI = Thrombolysis in Myocardial Infarction; VD = vessel disease.