We appreciate the interest in our article1. The author raised the issues of the driving force for myocardial flow, the flow ratio estimation, and the procedural order. Also, the author suggested that the application of the prediction model in Yaeger2 would improve the outcomes of FFR prediction.
Spaan et al3 showed that, even without collateral flows, (Pd–Pv)/(Pa–Pv) overestimates the coronary flow ratio (QS/QN) and the microvascular resistance (Rmin) increases as the distal pressure (Pd) falls. To build an equation to describe the P–Q relationship better, we introduced “R” corresponding to the inverse of ...
Sign in to read and download the full articleForgot your password?
Join us for free and access thousands of articles from EuroIntervention, as well as presentations, videos, cases from PCRonline.com