TABLE 3.
Comparison of select patient risk factors and processes of care by Society of Thoracic Surgeons predicted risk of mortality (STS PROM) threshold
| Variable | STS PROM ≤ 1.27% | STS PROM > 1.27% | P value |
|---|---|---|---|
| Median STS PROM, % | 0.7 (0.5, 0.9) | 2.4 (1.7, 4.0) | <.001 |
| Age, y | 59.0 ± 8.7 | 70.5 ± 9.4 | <.001 |
| Gender | <.001 | ||
| Male | 82.7 | 60.6 | |
| Female | 17.3 | 39.4 | |
| Weight, kg | 90 (79, 102) | 81 (70, 93) | <.001 |
| Height, cm | 175 (168, 180) | 170 (163, 178) | <.001 |
| Diabetes | 34.9 | 45.4 | <.001 |
| Dialysis | 0.1 | 5.5 | <.001 |
| Chronic lung disease | <.001 | ||
| Mild | 7.6 | 13.1 | |
| Moderate | 2.9 | 8.2 | |
| Severe | 0.8 | 4.8 | |
| Immunosuppression | 0.8 | 3.6 | <.001 |
| Peripheral vascular disease | 7.0 | 24.2 | <.001 |
| Cerebrovascular disease | 6.7 | 22.5 | <.001 |
| Cerebrovascular accident | 2.3 | 10.0 | <.001 |
| Myocardial infarction | 15.4 | 30.8 | <.001 |
| Heart failure | 4.6 | 21.6 | <.001 |
| New York Heart Association functional class | <.001 | ||
| I | 8.8 | 6.6 | |
| II | 34.5 | 21.9 | |
| III | 46.3 | 45.2 | |
| IV | 10.4 | 26.3 | |
| Atrial fibrillation | 1.8 | 7.1 | <.001 |
| Number of diseased vessels | <.001 | ||
| One | 5.3 | 2.5 | |
| Two | 20.3 | 14.6 | |
| Three | 74.1 | 82.8 | |
| Ejection fraction, % | 55 (50, 60) | 50 (40, 60) | <.001 |
| Status | <.001 | ||
| Elective | 46.5 | 32.3 | |
| Urgent | 53.1 | 60.0 | |
| Emergent | 0.4 | 7.7 | |
| Median surgeon volume | 530 (293, 848) | 582 (317, 930) | <.001 |
| Operative mortality | 0.6 | 3.7 | <.001 |
| Beta-blocker (preoperative) | 84.0 | 81.0 | <.001 |
| Beta-blocker (discharge) | 91.7 | 83.2 | <.001 |
| Antiplatelet (discharge) | 96.5 | 91.6 | <.001 |
| Lipid-lowering medication (discharge) | 92.1 | 82.1 | <.001 |
Values are given as median (25th, 75th percentile), mean ± standard deviation, or %. STS PROM, Society of Thoracic Surgeons predicted risk of mortality.