Table 4.
Adjusted odd ratios for postoperative AKI defined by RIFLE criteria in patients stratified by preoperative hemoglobin levels (selected group compared with the reference group with preoperative hemoglobin>14 g/dl)
| AKI Stages by RIFLE Criteria | Preoperative Hemoglobin, g/dl | ||||
|---|---|---|---|---|---|
| <10 | <11 | <12 | <13 | <14 | |
| Risk | |||||
| Odds ratio; 95% confidence interval | 2.6; 1.1 to 6.0 | 2.6; 1.1 to 6.5 | 2.1; 1.0 to 5.0 | 2; 1.0 to 4.5 | 2; 1.0 to 4.7 |
| P value | 0.02 | 0.03 | 0.07 | 0.07 | 0.08 |
| Injury | |||||
| Odds ratio; 95% confidence interval | 1.6; 1.5 to 5.0 | 1.8; 1.0 to 4.6 | 2.2; 1.1 to 5.0 | 1.4; 1.0 to 3.3 | 1.3; 1.0 to 3.0 |
| P value | 0.40 | 0.20 | 0.06 | 0.30 | 0.50 |
| Failure | |||||
| Odds ratio; 95% confidence interval | 4.7; 1.6 to 15.5 | 4.5; 1.7 to 13.4 | 2.7; 1.1 to 7.9 | 2.4; 1.0 to 6.7 | 2.2; 1.0 to 6.1 |
| P value | 0.007 | 0.004 | 0.04 | 0.07 | 0.09 |
Values were obtained by multivariate analysis after adjustment for sex, severity of preoperative CKD, severity of preoperative heart failure (NYHA classifications I and IV), baseline diabetes mellitus, incidence of blood transfusion, type of surgery (CABG alone versus a combination of CABG and valve surgery), use of diuretics, intraoperative inotrope use, and crossclamp and perfusion times.