Quantitative flow ratio virtual pullback index predicts focal coronary artery disease identified on wire-based pullback pressure gradient

Figure 3 Correlation between quantitative flow ratio virtual pullback index and pressure pullback gradient and diagnostic performance for identifying focal coronary artery disease. A: It shows the relationship between quantitative flow ratio virtual pullback (QVP) index and wire-based pressure pullback gradient in fractional flow reserve-significant lesions; B: It presents the receiver operating characteristic curve for QVP index in detecting focal coronary artery disease (area under the curve = 0.73). Together, these panels demonstrate the association between the two indices and the ability of QVP index to discriminate focal disease. PCI: Percutaneous coronary intervention; PPG: Pressure pullback gradient; QVPi: Quantitative flow ratio virtual pullback index; ROC: Receiver operating characteristic.