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Table 2 Functional assessments

From: Physiological benefits evaluated by quantitative flow ratio in patients with reduced left ventricular ejection fraction who underwent percutaneous coronary intervention

  Reduced LVEF group
(n = 48)
Normal LVEF group
(n = 253)
P value
Pre-PCI QFR 0.67 ± 0.16 0.73 ± 0.15 0.004
Post-PCI QFR 0.96 ± 0.06 0.97 ± 0.06 0.239
Follow-up QFR 0.94 ± 0.10 0.96 ± 0.08 0.216
Increasing QFR* 0.27 ± 0.18 0.22 ± 0.15 0.043
Post-PCI MLD 3.75 (2.40) 3.40 (2.10) 0.225
Follow-up MLD 2.80 (1.90) 2.80 (1.80) 0.717
LLL 0.60 (1.85) 0.40 (1.70) 0.229
Pre-PCI LVEF, % 41.70 ± 6.21 65.95 ± 7.10  < 0.001
Follow-up LVEF, % 47.39 ± 10.62 65.51 ± 7.36  < 0.001
Increasing LVEF*, % 6.05 ± 9.45  − 0.37 ± 8.11  < 0.001
  1. Values are the mean ± standard deviation, median (interquartile range)
  2. LVEF, left ventricular ejection fraction; PCI, percutaneous coronary intervention; QFR, quantitative flow ratio. MLD, minimal lumen diameter; LLL, late lumen loss
  3. *Increasing QFR = Follow-up QFR – Pre-PCI QFR; Increasing LVEF = Follow-up LVEF – Pre-PCI LVEF