TABLE 3.
Comparison of QFR/iFR discordant groups
| QFR−/iFR + group (n = 32) | QFR+/iFR− group (n = 18) | p value | |
|---|---|---|---|
| Patient characteristics | |||
| Age | 68.7 ± 9.9 | 64.3 ± 9.9 | 0.144 |
| Sex male | 25 (92.6) | 15 (88.2) | 0.715 |
| Hypertension | 28 (87.5) | 12 (66.7) | 0.244 |
| Dyslipidaemia | 20 (64.5) | 9 (50.0) | 0.753 |
| Diabetes mellitus | 15 (46.9) | 6 (33.3) | 0.388 |
| Smoking | 7 (21.9) | 3 (16.7) | 0.142 |
| Peripheral artery disease | 12 (37.5) | 4 (22.2) | 0.514 |
| Previous PCI | 15 (46.9) | 7 (38.9) | 0.762 |
| CKD | 11 (34.4) | 4 (22.2) | 0.520 |
| LAD | 16 (50.0) | 12 (64.7) | 0.374 |
| Non‐LAD | 16 (50.0) | 16 (45.3) | |
| Proximal lesions | 13 (40.6) | 3 (16.7) | 0.081 |
| Physiological indices | |||
| FFR | 0.84 ± 0.05 | 0.81 ± 0.06 | 0.113 |
| QFR | 0.86 ± 0.05 | 0.72 ± 0.07 | 0.001 |
| iFR | 0.83 ± 0.07 | 0.94 ± 0.02 | 0.001 |
| Pattern of coronary artery disease | |||
| iFR pullback physiologically focal | 6 (18.8) | 10 (55.6) | 0.012 |
| iFR pullback physiologically diffuse | 26 (81.2) | 8 (44.4) | |
| QFR pullback physiologically focal | 10 (31.3) | 13 (72.2) | 0.008 |
| QFR pullback physiologically diffuse | 22 (68.7) | 5 (28.8) | |
| Angiographically focal | 16 (50.0) | 10 (55.6) | 0.706 |
| Angiographically diffuse | 16 (50.0) | 8 (44.4) | |
Abbreviations: CKD, chronic kidney disease; FFR, fractional flow reserve; iFR, instantaneous wave‐free ratio; LAD, left anterior descending artery; PCI, percutaneous coronary intervention; QFR, quantitative flow reserve.