Author + information
- Carlo Caiati,
- Mario Lepera,
- Daniela Santoro,
- Dario Grande,
- Fortunato Iacovelli,
- Nicola Tarantino,
- Antonio Tito,
- Isabella Lacitignola,
- Marco Basile,
- Filippo Masi and
- Stefano Favale
To verify whether the severity of coronary stenosis could be non-invasively assessed by enhanced transthoracic coronary echo Doppler in convergent color Doppler mode (CED) over a wide range of values (from severe to mild).
In 54 consecutive patients with a diseased left anterior descending coronary artery (LAD), as assessed by catheterization (cath) (either quantitative coronary angiography or intracoronary ultrasound), color-guided pulsed wave Doppler sampling in the LAD was performed in order to measure the velocity at the stenosis site and in a reference adjacent segment. Then the continuity equation was applied to calculate the percent cross sectional area reduction (% CSA) at the stenosis site. The formula applied was: % CSA = 100 × (1-[TVIref × 0.5]/TVIs) (TVI= time velocity integral at the stenosis (s) and the reference site (ref), respectively; 0.5 = correcting factor for a parabolic profile that was used only when the stenosis velocity was >100 cm/sec).
CED feasibility was 100%. Doppler and cath-derived % CSA stenosis showed a very good agreement over a large range of values (from mild to severe): there was no significant bias; in all but 5 patients the difference between cath and CED % CSA was < 20% (limits of agreement = from −27.53 to 24.88, see graph). The scatter was slightly larger for mild stenoses. The correlation was strong (R= 0.86, p<0.001).
CED is a feasible and reliable method for assessing the severity of LAD stenosis by applying the continuity equation.
Poster Sessions, Expo North
Sunday, March 10, 2013, 3:45 p.m.-4:30 p.m.
Session Title: Imaging: Echocardiographic Imaging of Patients with CAD: I
Abstract Category: 18. Imaging: Echo
Presentation Number: 1267-333
- 2013 American College of Cardiology Foundation