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Distribution of iFR and FFR at prespecified cut-offs.
| FFR treat | FFR “gray zone” | FFR defer | ||
|---|---|---|---|---|
| <0.75 | 0.75–0.80 | >0.80 | ||
| iFR treat | ≤0.85 | 9 | 6 | 1 |
| iFR “adenosine zone” | 0.86–0.93 | 7 | 11 | 16 |
| iFR defer | >0.93 | 0 | 2 | 31 |
FFR, fractional flow reserve; iFR, instantaneous wave-free ratio.
