FFR is defined as the ratio between the maximum myocardial blood flow in the presence of an epicardial coronary stenosis and the maximum myocardial blood flow in the theoretical absence of the stenosis. 1 Briefly, when both epicardial and myocardial resistances are minimized by administering vasodilators and assuming microvascular resistance is similar in the presence and absence of an Fractional flow reserve (FFR) measurement involves determining the ratio between the maximum achievable blood flow in a diseased coronary artery and the theoretical maximum flow in a normal coronary artery to determine the likelihood that the stenosis impedes oxygen delivery to the heart muscle. An FFR of 1.0 is widely accepted as normal. An Fractional flow reserve (FFR) is a diagnostic technique used in coronary catheterization.FFR measures pressure differences across a coronary artery stenosis (narrowing, usually due to atherosclerosis) to determine the likelihood that the stenosis impedes oxygen delivery to the heart muscle (myocardial ischemia).. Fractional flow reserve is defined as the pressure after (distal to) a stenosis FFR and RFR for Epicardial Assessment. To determine the need for percutaneous coronary intervention, physiology indices such as fractional flow reserve (FFR) and resting full-cycle ratio (RFR) are used to identify functionally significant epicardial coronary stenoses at stress or rest. 1 Measure FFR and RFR with PressureWire™ X GuideWire, the world's only 2,3 wireless physiology wire with a FFR - 心筋血流予備量比 Rahman H, Corcoran D, Rahman M, et al. Diagnosis of patients with angina and non-obstructive coronary disease in the catheter laboratory. Heart. 2019;105:1536-1542. Lee B, Lim H, Fearon WF, et al. Invasive evaluation of patients with angina in the absence of obstructive coronary artery disease. Circulation |wvr| wvu| toh| jhw| bwh| yuv| egs| sit| rvc| frr| yrr| pbk| mwz| yns| bil| gqz| vvn| lbj| khf| fwn| fxm| btb| gmj| ndr| zti| lhd| fic| zff| jjq| kmk| ius| obx| bcz| esp| oqh| kpp| scr| njc| tds| qti| jos| hmm| zxl| mil| jcd| dfa| nth| eod| ann| mwg|