(Circulation. 1999;99:771-778.)
© 1999 American Heart Association, Inc.
Clinical Investigation and Reports |
New Noninvasive Method for Coronary Flow Reserve Assessment
Contrast-Enhanced Transthoracic Second Harmonic Echo Doppler
From the Institute of Cardiology, University of Cagliari, Cagliari, Italy.
Correspondence to Dr Carlo Caiati, Cattedra e Divisione di Cardiologia, Ospedale S Giovanni di Dio, Via Ospedale 46, 09124, Cagliari, Italy. E-mail carlo.caiati{at}teseo.it
Background—We tested the hypothesis that blood flow velocity could be recorded in the left anterior descending coronary artery (LAD) during transthoracic echocardiography by use of second harmonic echo Doppler modality along with contrast enhancement (intravenous Levovist) at rest and after pharmacologically induced maximal vasodilation to assess coronary flow reserve (CFR) with a totally noninvasive approach.
Methods and Results—Fifty-six consecutive patients undergoing coronary angiography underwent transthoracic contrast-enhanced pulsed-wave Doppler recording of blood flow velocity in the LAD by use of harmonic color Doppler as a guide at rest and after maximal vasodilation by dipyridamole infusion. Contrast enhancement with the harmonic mode greatly improved the success rate of recording adequate pulsed-wave Doppler signal in the LAD. CFR was (mean±SD) 1.54±0.7 in patients with (group 1) and 2.79±0.9 in patients without (group 2) significant LAD stenosis (lumen narrowing >70%) (P<0.001); sensitivity and specificity in detecting significant LAD stenosis were 86% and 90%, respectively. There was close agreement between CFRs determined by this new method and intracoronary Doppler flow wire.
Conclusions—Contrast-enhanced transthoracic echo Doppler with the harmonic mode is a feasible and promising technique for assessing CFR in a totally noninvasive way.
Key Words: blood flow • coronary disease • contrast media • echocardiography
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