Table 3.
Outcomes of propensity score matching
| Before matched | After matched | |||||
| HR ≤80 (n=304) | HR >80 (n=403) |
P value | HR ≤80 (n=266) |
HR >80 (n=266) |
P value | |
| WBC, ×109 | 10.2±3.74 | 11.8±4.28 | <0.001 | 10.6±3.76 | 11.1±4.15 | 0.238 |
| Heart rate in ED | 84.5±14.6 | 90.1±16.0 | <0.001 | 85.8±14.5 | 86.7±14.5 | 0.281 |
| Age | 48.3±10.6 | 45.3±9.98 | <0.001 | 47.1±10.4 | 46.7±9.97 | 0.699 |
| BMI, kg/m2 | 25.0±3.85 | 26.1±4.05 | <0.001 | 25.2±3.92 | 25.4±3.61 | 0.510 |
| Chest pain | 257 (84.5) | 366 (90.8) | 0.0175 | 233 (87.6) | 240 (90.2) | 0.392 |
| Haemoglobin, g/L | 130±18.9 | 133±19.6 | 0.0522 | 131±19.2 | 131±19.7 | 0.674 |
| Renal insufficiency | 11 (3.6) | 24 (6.0) | 0.169 | 10 (3.8) | 11 (4.1) | 0.990 |
| CPB time | 196±57.2 | 203±72.1 | 0.369 | 197±58.8 | 199±66.3 | 0.981 |
| Preoperative SBP | 138±26.3 | 137±27.3 | 0.941 | 138±26.9 | 135±26.8 | 0.385 |
| EF <50% | 16 (5.3) | 16 (4.0) | 0.488 | 14 (5.3) | 12 (4.5) | 0.850 |
| Back pain | 91 (29.9) | 132 (32.8) | 0.466 | 82 (30.8) | 87 (32.7) | 0.693 |
| Time from onset of symptom to surgery, days | 7.76±8.63 | 7.28±9.11 | 0.188 | 7.65±8.73 | 7.65±9.86 | 0.434 |
| Concomitant surgery | 125 (41.1) | 176 (43.7) | 0.538 | 108 (40.6) | 118 (44.4) | 0.417 |
| Smoker | 131 (43.1) | 165 (40.9) | 0.606 | 108 (40.6) | 115 (43.2) | 0.595 |
| Abdominal pain | 106 (34.9) | 149 (37.0) | 0.568 | 96 (36.1) | 101 (38.0) | 0.704 |
| Stroke | 16 (5.3) | 18 (4.5) | 0.715 | 11 (4.1) | 11 (4.1) | 1.000 |
| Sex, male | 235 (77.3) | 317 (78.7) | 0.713 | 207 (77.8) | 212 (79.7) | 0.680 |
| Coronary heart disease | 22 (7.2) | 26 (6.5) | 0.762 | 20 (7.5) | 19 (7.1) | 0.990 |
| Diabetes mellitus | 7 (2.3) | 8 (2.0) | 0.779 | 7 (2.6) | 5 (1.9) | 0.764 |
| Hypertension | 219 (72.0) | 293 (72.7) | 0.860 | 192 (72.2) | 189 (71.1) | 0.852 |
| LVEDD, mm | 51.7±7.44 | 51.6±7.32 | 0.947 | 51.4±7.36 | 51.7±7.62 | 0.903 |
| Intraoperative blood loss (mL/kg) | 13.0±9.42 | 12.8±9.67 | 0.369 | 12.9±9.73 | 13.6±10.9 | 0.787 |
| Moderate or more PE | 42 (13.8) | 57 (14.1) | 0.907 | 34 (12.8) | 37 (13.9) | 0.799 |
| Moderate or more AI | 112 (36.8) | 148 (36.7) | 0.999 | 94 (35.3) | 96 (36.1) | 0.925 |
| 30-day postoperative mortality | 15 (4.9) | 47 (11.7) | <0.001 | 13 (4.9) | 32 (12.0) | 0.0025 |
| Estimated long-term mortality | 11.1% | 19.7% | <0.001 | 7.70% | 21.1% | <0.001 |
Data are means±SD or number (%).
AI, aortic regurgitation; BMI, body mass index; CPB, cardiopulmonary bypass; ED, emergency department; EF, ejection fraction; HR, heart rate; LVEDD, left ventricle end-diastolic dimension; PE, pericardial effusion; SBP, systolic blood pressure; WBC, white blood cell.