Table 1. Differences of baseline, intraoperative and postoperative variables between AKI and non-AKI patients.
| Non-AKI (n = 129) | AKI (n = 83) | P | |
| Demography | |||
| Age (y) | 59.3±12.4 | 65.5±7.8 | <0.0001 |
| Male (%) | 100 (77.5) | 63 (75.9) | 0.785 |
| Weight (kg) | 68.9±12.3 | 70.6±10.3 | 0.289 |
| Height (m) | 1.66±0.10 | 1.67±0.09 | 0.686 |
| Body mass index (kg/m2) | 25.0±4.8 | 25.4±3.1 | 0.475 |
| Body surface (m2) | 1.74±0.20 | 1.77±0.16 | 0.338 |
| Preoperative parameters | |||
| ARAS (%) | 19 (14.7) | 31 (37.3) | <0.001 |
| Hypertension (%) | 79 (61.2) | 56 (67.5) | 0.484 |
| Diabetes (%) | 38 (29.4) | 31 (37.3) | 0.232 |
| Current smoker (%) | 33 (25.6) | 15 (18.1) | 0.204 |
| Stroke (%) | 20 (15.5) | 17 (20.5) | 0.814 |
| NYHA class | 1.6±0.6 | 1.9±0.7 | 0.005 |
| I (%) | 60 (46.5) | 25 (30.1) | |
| II (%) | 57 (44.2) | 43 (51.8) | |
| III (%) | 12 (9.3) | 13 (15.7) | |
| IV (%) | 0 (0) | 2 (2.4) | |
| Severity of CAD | 2.3±1.1 | 2.7±0.8 | 0.009 |
| 0 (%) | 20 (15.5) | 4 (4.8) | |
| 1 (%) | 8 (6.2) | 5 (6.0) | |
| 2 (%) | 16 (12.4) | 7 (8.4) | |
| 3 (%) | 85 (65.9) | 67 (80.7) | |
| Left main disease (%) | 21 (16.2) | 22 (26.5) | 0.023 |
| Ejection fraction (%) | 60±12 | 58±12 | 0.268 |
| Cardiomegaly (%) | 37 (28.7) | 20 (24.0) | 0.254 |
| Myocardial infarction (%) | 43 (33.3) | 32 (38.5) | 0.438 |
| Systolic pressure (mmHg) | 120±17 | 123±15 | 0.293 |
| Diastolic pressure (mmHg) | 71±9 | 72±8 | 0.201 |
| Time from contrast administration to surgery (day) | 9.2±6.7 | 9.4±12.6 | 0.404 |
| On IABP prior to surgery, % | 4 (3.1) | 6 (7.2) | 0.179 |
| Albumin (mg/L) | 35.8±5.8 | 35.9±4.9 | 0.845 |
| BUN (mmol/L) | 6.6±2.7 | 6.6±2.1 | 0.532 |
| CrPre (µmol/L) | 90.6±22.1 | 92.9±26.0 | 0.490 |
| Intraoperative parameters | |||
| Valve surgery (%) | 26 (20.2) | 10 (12.0) | 0.078 |
| OPCAB (%) | 40 (31.0) | 21 (25.3) | 0.371 |
| Anastomoses | 3.2±0.9 | 3.2±0.7 | 0.828 |
| Postoperative parameters | |||
| CrmaxPost (µmol/L) | 97.7±23.5 | 169.9±84.0 | <0.001 |
| ΔCr (µmol/L) | 21.2±20.5 | 130.5±80.0 | <0.0001 |
| %ΔCr | 25±25 | 178±78 | <0.0001 |
ARAS: atherosclerotic renal artery stenosis; IABP: intra-aortic balloon pump; BUN: blood urea nitrogen; CrPre: preoperative creatinine; NYHA: New York Heart Association; CAD: coronary artery disease; CrmaxPost: peak postoperative creatinine; ΔCr:difference between preoperative creatinine and postoperative creatinine; %ΔCr: percentage change of creatinine.