Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Changes of FFR and iFR according to anatomical and hemodynamic stenosis severity. Regardless of (A) anatomical or (B) hemodynamic epicardial stenosis severity indices, the iFR threshold for separating normal from abnormal values matches with a more severe stenosis level than that for FFR. This figure was modified from the original version.21)
FFR = fractional flow reserve; iFR = instantaneous wave-free ratio.
