iFR-FFR comparison in daily practice: a single-center, prospective, online assessment.

Aims: To compare the performance of instantaneous wave-free ratio (iFR) with fractional flow reserve (FFR) in a real-life, prospective, single-center, and independent study.

Methods And Results: Fifty-four patients were included and 89 angiographic intermediate lesions underwent functional evaluation with both iFR and FFR. FFR was used as the gold standard, and the patients having FFR values 0.