Table 1.
Baseline characteristics.
| Post-operative high-sensitivity troponin T levels (ng/L) | ≤140 (n=38) | 141-500 (n=360) | >500 (n=162) | P-value |
|---|---|---|---|---|
| Demographics | ||||
| Age (years) | 61.4 (9.9) | 64.2 (9.9) | 65.1 (9.6) | 0.105 |
| Male (%) | 76.3% (29) | 80.8% (291) | 80.2% (130) | 0.800 |
| Ethnicity (%) | 0.150 | |||
| Caucasian | 57.9% (22) | 58.3% (210) | 46.3% (75) | |
| Maori/Pacific Islander | 23.7% (9) | 20.8% (75) | 25.3% (41) | |
| Other | 23.7% (9) | 20.8% (75) | 28.4% (46) | |
| Body mass index (kg/m2) | 29.6 (5.8) | 29.4 (5.4) | 28.4 (4.9) | 0.102 |
| Presentation | ||||
| Canadian Cardiovascular Society Class IV angina (%) | 39.5% (15) | 35.0% (126) | 39.5% (64) | 0.571 |
| New York Heart Association Class IV dyspnoea (%) | 5.3% (2) | 2.5% (9) | 6.2% (10) | 0.109 |
| Recent myocardial infarction within 6 weeks (%) | 36.8% (14) | 43.1% (155) | 50.6% (82) | 0.163 |
| Pre-operative intra-aortic balloon pump (%) | 7.9% (3) | 5.8% (21) | 10.5% (17) | 0.166 |
| Urgent operation (%) | 71.1% (27) | 70.3% (253) | 73.5% (119) | 0.759 |
| Past medical history | ||||
| Myocardial infarction (%) | 55.3% (21) | 63.3% (228) | 66.7% (108) | 0.405 |
| Percutaneous coronary intervention (%) | 13.2% (5) | 9.2% (33) | 14.2% (23) | 0.209 |
| Coronary artery bypass grafting (%) | 2.6% (1) | 0.6% (2) | 3.7% (6) | 0.026 |
| Congestive heart failure (%) | 5.3% (2) | 4.1% (15) | 4.9% (8) | 0.897 |
| Atrial fibrillation (%) | 2.6% (1) | 6.7% (24) | 7.4% (12) | 0.565 |
| Diabetes (%) | 36.8% (14) | 35.0% (126) | 43.2% (70) | 0.200 |
| Diabetes on insulin (%) | 10.5% (4) | 7.5% (27) | 14.2% (23) | 0.055 |
| Hypercholesterolemia | 92.1% (35) | 91.7% (330) | 90.7% (147) | 0.930 |
| Hypertension | 63.2% (24) | 71.1% (256) | 59.9% (109) | 0.464 |
| Current smoker (%) | 15.8% (6) | 13.6% (49) | 12.3% (20) | 0.837 |
| Stroke (%) | 5.3% (2) | 5.6% (20) | 4.9% (8) | 0.959 |
| Peripheral vascular disease (%) | 0.0% (0) | 10.3% (37) | 13.0% (21) | 0.062 |
| Chronic respiratory disease (%) | 13.2% (5) | 17.8% (64) | 19.8% (32) | 0.622 |
| Dialysis (%) | 0.0% (0) | 0.6% (2) | 8.0% (13) | <0.001 |
| Investigations | ||||
| Left main stem stenosis >50% (%) | 55.3% (21) | 39.2% (141) | 48.1% (78) | 0.044 |
| Three-vessel disease (%) | 71.1% (27) | 77.2% (278) | 87.0% (141) | 0.014 |
| Ejection fraction (%) | 0.432 | |||
| Normal (>50%) | 73.7% (28) | 74.7% (269) | 67.3% (109) | |
| Mild impairment (40-50%) | 13.2% (5) | 14.2% (51) | 14.8% (24) | |
| Moderate impairment (30-40%) | 7.9% (3) | 6.4% (23) | 12.3% (20) | |
| Severe impairment (<30%) | 5.3% (2) | 4.6% (17) | 5.6% (9) | |
| Estimated glomerular filtration rate (mL/min) | 95 (34) | 82 (25) | 74 (35) | <0.001 |
| Pre-operative troponin groups | <0.001 | |||
| Normal (%) | 84.2% (32) | 62.2% (224) | 50.0% (81) | |
| Stable elevated (%) | 15.8% (6) | 37.8% (136) | 50.0% (81) | |
| EuroScore II(10) | 1.8% (1.0%) | 2.2% (3.1%) | 2.7% (3.5%) | 0.046 |