Table 1.
Preoperative profile and operative data
| Variable | Number (percentage) or mean ± standard deviation |
| Age (years) | 64.5 ± 14.2 |
| Male gender | 324 (69) |
| Body surface area (m2) | 1.81 ± 0.18 |
| Left ventricle ejection fraction | 0.51 ± 0.12 |
| Unstable angina | 36 (7.7) |
| Previous vascular surgery | 19 (4.1) |
| Previous cardiac surgery | 39 (8.3) |
| Recent myocardial infarction | 113 (24) |
| Congestive heart failure | 30 (6.4) |
| Cardiogenic shock | 5 (1.1) |
| Preoperative intra-aortic balloon pump | 4 (0.8) |
| Active endocarditis | 7 (1.5) |
| Dialytic treatment | 4 (0.8) |
| Diabetes on medication | 56 (12) |
| Chronic obstructive pulmonary disease | 19 (4.1) |
| Previous cerebrovascular accident | 33 (7) |
| Hematocrit (percentage) | 39.8 ± 4.6 |
| Serum creatinine value (mg/dl) | 1.1 ± 0.8 |
| Isolated coronary operation | 211 (45) |
| Isolated valve operation | 138 (29) |
| Combined operation | 121 (26) |
| CPB duration (minutes) | 81 ± 41 |
| Lowest hematocrit on CPB (percentage) | 27 ± 3.5 |
| Lowest oxygen delivery on CPB (ml/minute per m2) | 291 ± 44 |
| Lowest temperature on CPB (°C) | 31 ± 1.9 |
| Peak blood lactate (mmol/l) | 1.5 ± 1.3 |
| Peak blood glucose (mg/dl) | 133 ± 47 |
CPB, cardiopulmonary bypass.