Options in Coronary Physiology

The use of Fractional Flow Reserve (FFR) and Resting Indices for coronary physiologic assessment.

  1. FFR - FFR is the maximum flow down a vessel in the presence of stenosis compared to maximum flow in the hypothetical absence of the stenosis.
  2. Pd/Pa - Pd/Pa calculates the entire cardiac cycle at rest.
  3. dPR - dPR calculates Pd/Pa in diastole. Measuring different parts of diastole yields results that are numerically identical.

 

FFR

Pd/Pa

dPR (iFR)

Type

Whole-cycle

Whole-cycle

Diastolic

Cutoff

0.80

0.91

0.89

No Hyperemic Agent Required

X

Clinical Outcomes

X

Long-Term Clinical Outcomes

X

X