Table 2.
Operative and post-operative variables.
| Post-operative high-sensitivity troponin T levels (ng/L) | ≤140 (n=38) | 141-500 (n=360) | >500 (n=162) | P-value |
|---|---|---|---|---|
| Operation details | ||||
| Off-pump (%) | 13.2% (5) | 1.7% (6) | 2.5% (4) | <0.001 |
| Number of distal anastomoses | 0.002 | |||
| 1 | 5.3% (2) | 1.1% (4) | 0.6% (1) | |
| 2 | 28.9% (11) | 16.1% (58) | 10.5% (17) | |
| 3 | 44.7% (17) | 47.2% (170) | 55.6% (90) | |
| 4 | 18.4% (7) | 31.9% (115) | 23.5% (38) | |
| 5 | 2.6% (1) | 3.3% (12) | 9.3% (15) | |
| 6 | 0.0% (0) | 0.3% (1) | 0.6% (1) | |
| Left internal mammary artery graft (%) | 94.7% (36) | 98.3% (354) | 96.3% (156) | 0.204 |
| Right internal mammary artery graft (%) | 2.6% (1) | 3.9% (14) | 10.5% (17) | 0.008 |
| Radial artery graft (%) | 18.4% (7) | 26.1% (94) | 19.1% (31) | 0.164 |
| Saphenous vein grafts (%) | 86.8% (33) | 93.3% (336) | 95.7% (155) | 0.129 |
| Cardiopulmonary bypass time (minutes) | 85 (32) | 89 (23) | 97 (33) | 0.004 |
| Aortic cross-clamp time (minutes) | 54 (25) | 59 (19) | 63 (23) | 0.080 |
| Post-operative Outcomes | ||||
| ECG (new Q wave or left bundle branch block %) | 18.4% (7/38) | 13.1% (47/358) | 13.3% (21/158) | 0.630 |
| Echocardiogram (new regional wall motion abnormalities %) | 0.0% (0/1) | 8.7% (2/23) | 33.3% (9/27) | 0.094 |
| ECG and/or echocardiographic criteria (%) | 18.4% (7/38) | 13.7% (49/358) | 19.0% (30/158) | 0.271 |
| Composite morbidity (%) | 15.8% (6) | 10.6% (38) | 29.0% (47) | <0.001 |
| Stroke (%) | 0.0% (0) | 1.1% (4) | 1.9% (3) | 0.603 |
| Renal failure (%) | 5.3% (2) | 1.1% (4) | 1.9% (3) | 0.147 |
| Prolonged ventilation >24hours (%) | 10.5% (4) | 6.7% (24) | 22.8% (37) | <0.001 |
| Deep sternal wound infection (%) | 0.0% (0) | 0.3% (1) | 0.0% (0) | 0.757 |
| Reoperation (%) | 2.6% (1) | 3.9% (14) | 6.2% (10) | 0.430 |
| Operation to discharge (days) | 6.7 (2.8) | 7.8 (5.6) | 8.9 (5.7) | 0.028 |
| Re-admit to hospital within 30 days (%) | 26.3% (10) | 19.7% (71) | 20.4% (33) | 0.631 |
| 30-day mortality (%) | 2.6% (1) | 1.1% (4) | 3.1% (5) | 0.266 |
| Discharge medications | ||||
| Aspirin (%) | 97.3% (36/37) | 98.9% (353/357) | 98.7% (155/157) | 0.716 |
| Statin (%) | 94.6% (35/37) | 89.9% (321/357) | 86.0% (135/157) | 0.227 |
| Beta-blocker (%) | 89.2% (33/37) | 78.7% (281/357) | 73.9% (116/157) | 0.113 |
| Angiotensin converting enzyme blockers or Angiotensin II receptor blocker (%) | 32.4% (12/37) | 30.0% (107/357) | 29.3% (46/157) | 0.932 |