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. 2018 Feb 15;7(4):e008055. doi: 10.1161/JAHA.117.008055

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© 2018 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Distribution of per‐vessel fractional flow reserve. The histogram depicts the frequency of vessels by FFR values. Among the total 3298 vessels, 12.3% were functionally significant (FFR ≤0.80, yellow bars). The functionally insignificant vessels (87.7%, 2891/3298) are further categorized into quartiles and depicted as bars filled with graded saturation (blue). The darkest blue bars represent vessels in the lowest quartile (FFR 0.81–0.87) defined as moderate CAD in this study. CAD indicates coronary artery disease; FFR, fractional flow reserve.