Table 1.
Unmatched preoperative patient characteristics.
| Variable | Off-pump (n = 307) |
On-pump (n = 397) |
P value |
|---|---|---|---|
| Age (years ± SD) | 62.3 ± 11.8 | 62.7 ± 9.9 | 0.91 |
| Male | 219 (71.3) | 216 (54.4) | 0.02 |
| BMI | 29.1 ± 4.0 | 28.7 ± 4.1 | 0.87 |
| Diabetes | 108 (35.2) | 106 (26.7) | 0.03 |
| Hypertension | 163 (53.1) | 212 (53.4) | 0.97 |
| Never smoked | 99 (32.2) | 137 (34.5) | 0.76 |
| Hypercholesterolemia | 139 (45.3) | 157 (39.5) | 0.04 |
| COPD | 25 (8.1) | 33 (8.3) | 0.91 |
| CCS ≥ 3 | 79 (25.7) | 101 (25.4) | 0.97 |
| NYHA ≥ 2 | 166 (54.1) | 219 (55.2) | 0.87 |
| PVD | 27 (8.8) | 21 (5.3) | 0.03 |
| MI in 30 days prior to CABG | 79 (25.7) | 101 (25.4) | 0.99 |
| Preoperative serum creatinine ≥ 200 μmol·L−1 | 13 (4.2) | 7 (1.8) | 0.04 |
| <30% ejection fraction | 16 (5.2) | 22 (5.5) | 0.93 |
| 30–49% ejection fraction | 69 (22.5) | 98 (24.7) | 0.87 |
| ≥50% ejection fraction | 222 (72.3) | 277 (69.8) | 0.76 |
| Preoperative IV nitrates | 20 (6.5) | 31 (7.8) | 0.65 |
| Preoperative IV inotropes | 1 (0.3) | 2 (0.5) | 0.79 |
| Preoperative IABP | 19 (6.2) | 24 (6.0) | 0.97 |
| Previous PCI | 13 (4.2) | 17 (4.2) | 1.0 |
| CVA/TIA | 5/4 (2.9) | 3/9 (3.0) | 0.91 |
| LMS stenosis > 50% | 119 (38.8) | 159 (40.0) | 0.6 |
| Two vessels | 112 (36.5) | 110 (27.7) | 0.04 |
| Three vessels | 195 (63.5) | 287 (72.3) | 0.06 |
| Urgent | 101 (32.9) | 161 (40.6) | 0.03 |
| Logistic EuroSCORE (mean ± SD) | 3.3 ± 3.4 | 3.4 ± 3.6 | 0.76 |
Values in parentheses are percentages.
BMI: body mass index; CABG: coronary artery bypass grafting; CCS: Canadian Cardiovascular Society; COPD: chronic obstructive pulmonary disease; CVA: cerebrovascular accident; IABP: intra-aortic balloon pump; LMS: left main stem; MI: myocardial infarction; NHYA: New York Heart Association; PCI: percutaneous coronary intervention; PVD: peripheral vascular disease; SD: standard deviation; TIA: transient ischemic attack.