2.17 Flow Reserve Measurements

In this episode, we explore flow reserve measurements used to determine lesion significance in coronary artery disease. What is the difference between hyperemic and non-hyperemic wire-derived ratios? Which different segments of diastole are instantaneous wave-free ratio (IFR), diastolic pressure ratio (DPR), and diastolic hyperemia-free ratio (DFR) measured at? What are the cutoffs for fractional flow reserve (FFR), Pd/Pa, resting full-cycle ratio (RFR), IFR, DPR, and DFR? What are the non-wire-based flow reserve measurements? Tune in for answers to these questions.

Difficulty Level: Advanced

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