Residual Quantitative Flow Ratio to Estimate Post‐Percutaneous Coronary Intervention Fractional Flow Reserve

Table 5

Diagnostic performance of QFR and residual QFR to assess significant CAD (pre-PCI FFR ≤ 0.80) and a suboptimal PCI outcome (post-PCI FFR < 0.90), respectively.

Diagnostic performance	128 vessels
QFR to detect pre-PCI FFR ≤ 0.80
Sensitivity	100% (97–100%)
Specificity	27% (6–61%)
Negative predictive value	100% (not applicable)
Positive predictive value	94% (91–95%)
Accuracy	94% (88–97%)
Residual QFR to detect post-PCI FFR < 0.90
Sensitivity	44% (31–59%)
Specificity	96% (87–99%)
Negative predictive value	70% (65–75%)
Positive predictive value	89% (72–96%)
Accuracy	74% (66–82%)

Values are presented as % (95% confidence interval). FFR, fractional flow reserve; PCI, percutaneous coronary intervention; QFR, quantitative flow ratio.