|  | Univariate analysis |  | Multivariate analysis | ||
---|---|---|---|---|---|---|
 | Variables | OR (95%CI) | P value |  | OR (95%CI) | P value |
Patient characteristics | Male | 0.869 (0.557, 1.356) | 0.536 | Â | / | / |
 | Age(y) | 1.079 (1.053, 1.105) | < 0.001 |  | 1.060 (1.017, 1.106) | 0.006 |
 | BMI | 0.972 (0.904, 1.045) | 0.443 |  | / | / |
 | Hypertension | 0.996 (0.530, 1.871) | 0.989 |  | / | / |
 | COPD | 1.757 (0.744, 4.151) | 0.199 |  | / | / |
 | History of smoking | 0.893 (0.543, 1.468) | 0.655 |  | / | / |
 | Diabetes | 1.640 (0.597, 4.505) | 0.338 |  | / | / |
Preoperative factors | ASA classification | 4.191 (1.680, 10.455) | 0.002 | Â | 1.386 (0.303, 6.342) | 0.674 |
 | EF(%) | 0.791 (0.751, 0.832) | < 0.001 |  | 0.798 (0.742, 0.859) | < 0.001 |
 | GFR (ml/min*1.73m2) | 0.937 (0.921, 0.954) | < 0.001 |  | 0.933 (0.906, 0.961) | < 0.001 |
 | Hb (g/L) | 0.992 (0.980, 1.005) | 0.223 |  | / | / |
 | PaCO2 (mmHg) | 0.974 (0.936, 1.013) | 0.190 |  | / | / |
 | PaO2 (mmHg) | 0.984 (0.958, 1.011) | 0.242 |  | / | / |
 | Glucose (mmol/L) | 1.092 (0.926, 1.287) | 0.295 |  | / | / |
 | PLT (109/L) | 1.000 (0.997, 1.004) | 0.818 |  | / | / |
Intraoperative factors | Mitral valve stenosis classification | 1.296 (1.068, 1.571) | 0.009 | Â | 0.793 (0.434, 1.450) | 0.452 |
 | Mitral valve regurgitation classification | 1.335 (1.077, 1.656) | 0.008 |  | 1.005 (0.631, 1.599) | 0.984 |
 | Aortic valve stenosis classification | 0.996 (0.835, 1.188) | 0.962 |  | / | / |
 | Aortic valve regurgitation classification | 1.245 (0.969, 1.600) | 0.087 |  | / | / |
 | Isolated mitral valve repair | 0.664 (0.303, 1.455) | 0.306 |  | / | / |
 | Isolated mitral valve replacement | 3.062 (1.839, 5.100) | < 0.001 |  | 4.274 (0.771, 23.700) | 0.097 |
 | Isolated aortic valve replacement | 1.482 (0.938, 2.343) | 0.092 |  | / | / |
 | Multiple valves surgery | 5.634 (2.809, 11.301) | < 0.001 |  | 4.587 (1.398, 15.056) | 0.012 |
 | Tricuspid valve repair | 2.059 (1.263, 3.358) | < 0.004 |  | 0.604 (0.173, 2.113) | 0.430 |
 | Maze | 3.162 (1.936, 5.163) | < 0.001 |  | 1.490 (0.555, 4.003) | 0.429 |
 | Pacemaker implantation | 2.573 (1.405, 4.713) | 0.002 |  | 0.981 (0.332, 2.899) | 0.972 |
 | Ultrafiltration > 500 ml | 1.304 (0.836, 2.033) | 0.242 |  | / | / |
 | ACC time > 90 min | 2.154 (1.368, 3.391) | 0.001 |  | 1.192 (0.382, 3.719) | 0.762 |
 | CPB time > 142 min | 2.748 (1.727, 4.373) | < 0.001 |  | 1.132 (0.341, 3.753) | 0.840 |
 | Lowest hemoglobin(g/L) | 0.993 (0.971, 1.016) | 0.548 |  | / | / |
 | Highest Lac (mmol/L) | 1.693 (1.363, 2.101) | < 0.001 |  | 1.252 (0.881, 1.780) | 0.210 |
 | Highest glucose (mmol/L) | 1.048 (0.972, 1.131) | 0.219 |  | / | / |
 | Hemorrhage > 450 ml | 2.839 (1.690, 4.770) | < 0.001 |  | 1.975 (0.758, 5.148) | 0.164 |
 | Crystolloid infusion (ml) | 1.000 (1.000, 1.001) | 0.209 |  | / | / |
 | Colloid infusion (ml) | 1.000 (0.998, 1.001) | 0.805 |  | / | / |
 | VIS > 16.5 | 19.139 (10.128, 36.164) | < 0.001 |  | 12.331 (5.015, 30.318) | < 0.001 |