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.