(a) iFR
(b) FFR
(c)

Figure 1: Distribution of the iFR (a) and FFR (b), and the scatter plot comparing the iFR and FFR (c). Discordance of iFR ≤0.89 and FFR >0.8 was observed in 42 (13.8%) lesions. Discordance of iFR >0.89 and FFR ≤0.8 occurred in 38 (12.5%) lesions. iFR: instantaneous wave-free ratio; FFR: fractional flow reserve.