Table 2.
Intraoperative Variables by Status of AKIa.
| Variables | All patients (n = 624) | Non-AKI (n = 540) | AKI (n = 84) | P value |
|---|---|---|---|---|
| General anesthesia, n (%) | 620 (99.4) | 537 (99.4) | 83 (98.8) | 0.444 |
| Duration of surgery, minute | 290 (190, 380) | 285 (185, 370) | 300 (210, 410) | 0.172 |
| Estimated blood loss, per 100 ml | 2.0 (1.0, 4.4) | 2.0 (1.0, 4.0) | 3.0 (1.5, 6.0) | 0.022 |
| Minimum MAP, mm Hg | 73.3 (67.3, 78.7) | 73.3 (67.7, 78.6) | 72.5 (66.8, 79.8) | 0.719 |
| Radiographic contrast, n (%) | 12 (1.9) | 11 (2.0) | 1 (1.2) | 1.000 |
| Intraoperative fluids | ||||
| Total crystalloid, per 500 ml | 3.0 (2.0, 4.4) | 3.0 (2.0, 4.4) | 3.1 (2.0, 4.2) | 0.925 |
| Total colloid, per 500 ml | 2.0 (1.0, 2.0) | 2.0 (1.0, 2.0) | 2.0 (1.0, 2.5) | 0.077 |
| Volume of HES, per 500 ml | 1.0 (0.5, 2.0) | 1.0 (0.5, 2.0) | 1.0 (0.0, 2.0) | 0.889 |
| Mannitol, n (%) | 124 (19.9) | 97 (18.0) | 27 (32.1) | 0.002 |
| RBCs, n (%) | 119 (19.1) | 97 (18.0) | 22 (26.2) | 0.074 |
| Plasma, n (%) | 62 (9.9) | 53 (9.8) | 9 (10.7) | 0.798 |
| Platelets, n (%) | 6 (1.0) | 3 (0.6) | 3 (3.6) | 0.035 |
aContinuous variables were expressed as mean ± SD or median (25th percentile–75th percentile, IQR). Categorical variables were expressed as a number (%). Abbreviations: AKI, acute kidney injury; MAP, mean arterial pressure; HES, hydroxyethyl starch; RBC, red blood cell.