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Results of the ADVISE trial reported at TCT 2011
Date:11/11/2011

SAN FRANCISCO, CA NOVEMBER 11, 2011 Researchers conducting the ADVISE clinical trial have concluded that a new measure of stenosis severity, instantaneous wave-free ratio (iFR), yielded similar results to traditional fractional flow reserve (FFR) without the use of adenosine to induce maximum hyperemia. Trial results were presented today at the 23rd annual Transcatheter Cardiovascular Therapeutics (TCT) scientific symposium, sponsored by the Cardiovascular Research Foundation.

FFR, while the leading invasive measure of stenosis severity, is only used in 6% or fewer of percutaneous coronary intervention (PCI) cases in the United States. One of the reasons for the low usage rate is the required use of the drug adenosine, which minimizes and stabilizes coronary resistance during the test, but is uncomfortable for patients, as well as being time-consuming and expensive.

In ADVISE (ADenosine Vasodilation Independent Stenosis Evaluation), 157 stenoses (131 patients) were recruited to this pilot, nonrandomized, international, multi-center study. In their investigations, researchers developed a new pressure-based index that does not require adenosine.

Wave intensity analysis identified a period during the normal heart rhythm cycle where intracoronary resistance at rest is similar in variability and magnitude (CV: 0.080.06 and 284147mmHg.s/m) to those during FFR (CV: 0.080.06 and 302315mmHg.s/m, p=NS for both).

The resting ratio of the distal-to-proximal pressure during this period, iFR, correlated closely with FFR (r=0.9, p<0.001) with excellent diagnostic efficiency (receiver operating characteristic area under curve of 93%, at FFR<0.8), specificity, sensitivity, and negative and positive predictive values of 91%, 85%, 85% and 91%, respectively.

"The results of the ADVISE trial indicate that intra-coronary resistance is naturally constant and minimized during the wave-free period. The instantaneous wave-Free Ratio (iF
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Contact: Judy Romero
jromero@crf.org
Cardiovascular Research Foundation
Source:Eurekalert

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