Fig. 3

Cumulative frequency of pre- and post-PCI QFR in 2 groups. Left panel showed cumulative curves of both pre- and post-PCI QFR in predominantly focal disease defined by QFR PPG index at pre-PCI (≥ 0.78) and right panel showed those in predominantly diffuse disease (QFR PPG index < 0.78). Abbreviations: PCI, percutaneous coronary intervention; QFR, quantitative flow ratio; PPG, pressure pullback curve gradient.