The Flash FFR Ⅱ Study

caFFR is a new index of physiological assessment of coronary artery stenosis severity, based on angiographic images. Through two-dimensional analysis and three-dimensional reconstruction of two coronary angiography image series with an angle-off \> 30 degrees, combined with fluid mechanics, TIMI frame counting method, and optimized CFD algorithm, the pressure drop from coronary ostium to every point in the vessel can be obtained, and then the caFFR value of each point in the vessel can be computed. The cutoff value in this trial is caFFR ≤ 0.80 for myocardial ischemia.

FFR is a widely used, pressure-based functional assessment index of coronary stenoses obtained with an intracoronary pressure wire fitted with pressure sensors. The pressure wire passes through the stenosis and directly measures the pressure distal to the stenosis. FFR value can be obtained by combining the pressure at the coronary ostium and the distal pressure to the stenosis. The cutoff value in this trial is FFR ≤ 0.80 for myocardial ischemia.