Table 1. Comparison of preoperative variables.
| Variables | Total (n=582) | PMV (n=259) | Non-PMV (n=323) | P valuea |
|---|---|---|---|---|
| Demographic data | ||||
| Age (year) | 52.2±12.7 | 53.6±12.4 | 51.1±12.8 | 0.027 |
| Male (%) | 433 (74.4) | 191 (73.3) | 242 (74.9) | 0.746 |
| BMI (kg/m2) | 25.5±5.0 | 26.5±5.0 | 25.0±5.0 | 0.003 |
| Medical history | ||||
| Hypertension (%) | 413 (71.0) | 192 (74.1) | 221 (68.4) | 0.132 |
| Diabetes mellitus (%) | 11 (1.9) | 4 (1.5) | 7 (2.2) | 0.762 |
| Previous cardiac surgery (%) | 28 (4.8) | 7 (2.7) | 21 (6.5) | 0.033 |
| Previous coronary artery disease (%) | 21 (3.6) | 13 (5.0) | 8 (2.5) | 0.102 |
| Cerebrovascular disease (%) | 20 (3.4) | 9 (3.5) | 11 (3.4) | 0.964 |
| LVEF (%) | 57.0 (54.0, 60.0) | 57.0 (55.0, 59.0) | 57.5 (54.0, 60.0) | 0.559 |
| Pericardial effusion (%) | 21 (3.6) | 12 (4.6) | 9 (2.8) | 0.235 |
| Preoperative laboratory data | ||||
| WBC (109/L) | 11.1±4.1 | 11.6±4.3 | 10.8±3.8 | 0.015 |
| PLT (109/L) | 145.2±67.5 | 128.6±64.4 | 158.5±67.0 | <0.001 |
| Hb (g/L) | 119.2±25.9 | 114.7±26.8 | 122.8±24.6 | <0.001 |
| CRP | 27.7 (5.4, 89.5) | 31.2 (5.6, 101.9) | 26.2 (5.2, 83.1) | 0.163 |
| PCT | 1.0 (0.3, 3.6) | 1.7 (0.5, 6.2) | 0.7 (0.2, 2.4) | <0.001 |
| sCr (ìmol/L) | 102.6±72.1 | 120.0±84.8 | 88.6±56.3 | <0.001 |
| sCyC | 1.1±0.7 | 1.3±0.8 | 1.0±0.6 | <0.001 |
| ALB (g/L) | 36.2±4.9 | 35.5±5.2 | 36.9±4.6 | <0.001 |
| Fibrinogen (g/L) | 2.3 (1.6, 3.2) | 2.1 (1.5, 2.9) | 2.4 (1.8, 3.4) | <0.001 |
| Triglyceride (mmol/L) | 1.0 (0.7, 1.5) | 1.1 (0.8, 1.7) | 1.0 (0.7, 1.4) | 0.009 |
| D-dimer (ng/mL) | 4.5 (2.4, 9.3) | 5.3 (2.7, 13.0) | 4.1 (2.2, 7.7) | 0.002 |
Data presented as n (%); median (IQR). a, P values indicate differences between PMV and Non-PMV groups. P<0.05 was considered statistically significant. PMV, prolonged mechanical ventilation; BMI, body mass index; LVEF, left ventricular ejection fraction; WBC, white blood cell; PLT, platelet; Hb, hemoglobin; CRP, c reactive protein; sCr, serum creatinine; sCyC, serum cystatin C; ALB, albumin;