Table 1 Basic characteristics of the patients according to the differences between adjusted and unadjusted postoperative serum creatinine
|  | Underestimation n = 353 | Normal n = 641 | Overestimation n = 340 | P value |
|---|---|---|---|---|
Demographic data | ||||
 Male [n (%)] | 228 (64.6) | 338 (52.7) | 210 (61.8) | 0.687 |
 Age (years) | 61 ± 11 | 56 ± 12 | 52 ± 13 | < 0.001 |
 BMI (kg/m2) | 23.2 ± 3.0 | 23.3 ± 3.3 | 22.9 ± 3.4 | 0.314 |
Comorbid conditions [n (%)] | ||||
 Hypertension | 163 (46.2) | 218 (34.0) | 97 (28.5) | < 0.001 |
 DM | 73 (20.7) | 66 (10.3) | 20 (5.9) | < 0.001 |
 CKD | 6 (1.7) | 4 (0.6) | 4 (1.2) | 0.272 |
 Cancer | 3 (0.8) | 10 (1.6) | 7 (2.1) | 0.418 |
 ACS | 8 (2.3) | 13 (2.0) | 1 (0.3) | 0.073 |
 Stroke | 8 (2.3) | 19 (3.0) | 6 (1.8) | 0.494 |
 Atrial fibrillation | 12 (3.4) | 25 (3.9) | 13 (3.8) | 0.921 |
Contrast exposure [n (%)] | 210 (59.5) | 356 (55.5) | 168 (49.4) | 0.027 |
NYHA III-IV [n (%)] | 211 (59.8) | 470 (73.3) | 266 (78.2) | < 0.001 |
LVEF (%) | 59.7 ± 9.6 | 61.9 ± 8.6 | 60.6 ± 9.3 | 0.006 |
Preoperative SCr (μmol/L) | 87.4 ± 31.8 | 76.7 ± 17.1 | 81.9 ± 24.1 | < 0.001 |
APACHE II at ICU admission | 13.1 ± 3.4 | 12.0 ± 3.5 | 12.7 ± 3.9 | < 0.001 |
Type of surgery [n (%)] | ||||
 Off-pump | 154 (43.6) | 119 (18.6) | 5 (1.8) | < 0.001 |
  CABG | 154 (43.6) | 119 (18.6) | 5 (1.8) | < 0.001 |
 On-pump | 199 (56.4) | 522 (81.4) | 335 (98.5) | < 0.001 |
  Valvular surgery | 174 (49.3) | 424 (66.1) | 274 (80.6) | < 0.001 |
  CABG + valvular surgery | 25 (7.1) | 98 (15.3) | 61 (17.9) | < 0.001 |
 On pump-surgery variables | ||||
  CPB time (min) | 105.3 ± 45.2 | 91.2 ± 32.3 | 104.4 ± 72.2 | < 0.001 |
  Cross-clamp (min) | 63.9 ± 28.6 | 56.1 ± 30.6 | 60.1 ± 26.8 | 0.006 |
  Ultrafiltration (ml) | 1311 ± 1417 | 1727 ± 1036 | 1891 ± 1268 | < 0.001 |