Table 1.
Preoperative characteristics of patients undergoing on-pump and off-pump CABG
| Characteristics | On-pump group (n=13560) | Off-pump group (n=306) | P value |
|---|---|---|---|
| Male gender | 74.7 | 73.9 | 0.740 |
| Body mass index (Kg/m2) | 27.21±4.10 | 26.95±3.96 | 0.273 |
| Age (year) | 58.64±9.56 | 56.27±10.37 | <0.001 |
| Family history of CAD | 36.7 | 33.2 | 0.214 |
| Current cigarette smoking | 39.1 | 38.9 | 0.968 |
| Hyperlipidemia | 67.4 | 64.6 | 0.309 |
| Diabetes mellitus | 31.9 | 21.3 | <0.001 |
| Hypertension | 52.9 | 44.6 | 0.004 |
| Renal failure | 1.7 | 1.3 | 0.576 |
| Last creatinine (mg/dl) | 1.19±0.43 | 1.14±0.44 | 0.094 |
| Recent myocardial infarction | 39.1 | 38.6 | 0.862 |
| Cerebrovascular disease | 6.5 | 3.9 | 0.073 |
| Peripheral vascular disease | 1.8 | 1.6 | 0.817 |
| Congestive heart failure | 11.8 | 12.8 | 0.590 |
| Arrhythmia | 2.8 | 3.0 | 0.878 |
| Previous CABG | 0.2 | 0.0 | 0.999 |
| Previous PCI | 4.1 | 7.2 | 0.008 |
| Ejection fraction (%) | 49.40±10.28 | 51.34±10.19 | 0.002 |
| CCS score | 2.92±1.11 | 2.97±0.98 | 0.437 |
| Number of coronary arteries involvement | <0.001 | ||
| One vessel | 4.2 | 60.3 | |
| Two vessels | 22.5 | 27.2 | |
| Three vessels | 73.3 | 12.5 | |
| Left main lesions | 9.5 | 3.0 | <0.001 |
Data are presented as mean ± SD or percentages; CABG: Coronary Artery Bypass Grafting; PCI: Percutaneous Coronary Intervention; CCS: Canadian Cardiovascular Society Grading System