EPICARDIAL AND MICROVASCULAR DYSFUNCTION WITH FRACTIONAL FLOW RESERVE AND INSTANTANEOUS WAVE-FREE RATIO DIAGNOSIS IN FLOW-LIMITING CORONARY ARTERIES FROM IDEAL AND DEFINE-FLOW

Reconciling poststenotic pressure with hyperemic flow: comparing coronary flow reserve, instantaneous wave-free ratio, and fractional flow reserve.

Hybrid Instantaneous Wave-Free Ratio–Fractional Flow Reserve versus Fractional Flow Reserve in the Real World

BACKGROUND The instantaneous wave-free ratio (iFR) is a novel method to assess the ischemic potential of coronary artery stenoses. Clinical trial data have shown that iFR has acceptable diagnostic agreement with fractional flow reserve (FFR), the reference standard for the functional assessment of coronary stenoses. This study compares iFR measurements with FFR measurements in a real world, sin...

Use of the Instantaneous Wave-free Ratio or Fractional Flow Reserve in PCI.

BACKGROUND Coronary revascularization guided by fractional flow reserve (FFR) is associated with better patient outcomes after the procedure than revascularization guided by angiography alone. It is unknown whether the instantaneous wave-free ratio (iFR), an alternative measure that does not require the administration of adenosine, will offer benefits similar to those of FFR. METHODS We rando...

Does the instantaneous wave-free ratio approximate the fractional flow reserve?

OBJECTIVES This study sought to examine the clinical performance of and theoretical basis for the instantaneous wave-free ratio (iFR) approximation to the fractional flow reserve (FFR). BACKGROUND Recent work has proposed iFR as a vasodilation-free alternative to FFR for making mechanical revascularization decisions. Its fundamental basis is the assumption that diastolic resting myocardial re...

Reply: Is the instantaneous wave-free ratio equivalent to fractional flow reserve?

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