Table 1 Baseline characteristics of patients who underwent cardiac surgery
|  | All N = 3869 | Non-AKI N = 2401 | AKI N = 1468 |
|---|---|---|---|
Age (years) | 54.00 ± 14.00 | 53.00 ± 14.00 | 57.00 ± 12.00** |
Male (n, %) | 2271 (58.70%) | 1279 (53.27%) | 992 (67.57%)** |
BMI (kg/m2) | 23.00 ± 3.50 | 22.80 ± 3.40 | 23.40 ± 3.70** |
Hypertension (n, %) | 1135 (29.34%) | 649 (27.03%) | 486 (33.11%)** |
Diabetes (n, %) | 365 (9.43%) | 212 (8.83%) | 153 (10.42%) |
Preoperative angiography (n, %) | 1568 (40.53%) | 926 (38.57%) | 642 (43.73%)** |
NYHA III-IV (n, %) | 2289 (59.16%) | 1352 (56.31%) | 937 (63.83%)** |
Preoperative BUN (mmol/L) | 6.20 ± 1.90 | 6.00 ± 1.80 | 6.60 ± 2.00** |
Preoperative SCr (μmol/L) | 74.50 ± 15.50 | 73.20 ± 14.80 | 76.60 ± 16.30** |
Preoperative uric acid (μmol/L) | 356.60 ± 104.60 | 343.40 ± 98.20 | 378.20 ± 111.00** |
Preoperative eGFR (mL/min/1.73 m2) | 94.50 ± 22.20 | 95.10 ± 21.10 | 93.50 ± 23.80* |
eGFR ≥90 mL/min/1.73 m2 (n, %) | 2023 (52.29%) | 1303 (54.27%) | 720 (49.05%)** |
Preoperative proteinuria (n, %) | 248 (6.41%) | 130 (5.41%) | 118 (8.04%)** |
Type of surgery: | |||
  Valve (n, %) | 2238 (57.84%) | 1353 (56.35%) | 885 (60.29%)* |
  CABG (n, %) | 734 (18.97%) | 499 (20.78%) | 235 (16.01%)** |
  Aneurysm (n, %) | 199 (5.14%) | 85 (3.54%) | 114 (7.77%)** |
  Valve + CABG (n, %) | 156 (4.03%) | 67 (2.79%) | 89 (6.06%)** |
Cardiopulmonary bypass duration (min) | 99.00 ± 40.50 | 91.00 ± 34.00 | 114.00 ± 45.00** |
Aortic cross clamping duration (min) | 59.20 ± 26.90 | 55.00 ± 24.00 | 65.00 ± 29.00** |