ARF scorea
| Risk Factor | Points |
|---|---|
| Female gender | 1 |
| Congestive heart failure | 1 |
| Left ventricular ejection fraction <35% | 1 |
| Preoperative use of IABP | 2 |
| COPD | 1 |
| Insulin-requiring diabetes | 1 |
| Previous cardiac surgery | 1 |
| Emergency surgery | 2 |
| Valve surgery only (reference to CABG) | 1 |
| CABG + valve (reference to CABG) | 2 |
| Other cardiac surgeries | 2 |
| Preoperative creatinine 1.2 to <2.1 mg/dl (reference to 1.2) | 2 |
| Preoperative creatinine ≥2.1 (reference to 1.2) | 5 |
↵a Minimum score, 0; maximum score, 17.