Table 2. Intraoperative and postoperative risk factors for severe AKI ( n = 99) .
| Variable | All Median (IQR) or number (%) n = 99 |
No/mild AKI Median (IQR) or number (%) n = 64 |
Severe AKI Median (IQR) or number (%) n = 35 |
p- Value (univariate) | OR | 95% confidence interval | p- Value (multivariable) |
|---|---|---|---|---|---|---|---|
| Intraoperative (mean) | |||||||
| Cardiac index | 2.9 (1.5, 4.2) | 3.8 (2, 4.4) | 1.9 (1, 3.3) | 0.001 | 0.62 | 0.1–3.72 | 0.6 |
| MAP | 57 (52, 63) | 57 (53, 62) | 57 (51, 63) | 0.7 | 1.86 | 0.67–5.17 | 0.2 |
| Hematocrit | 35 (32, 38) | 34 (32, 37) | 37 (35, 39) | <0.001 | 2.45 | 0.87–6.88 | 0.09 |
| Lowest renal NIRS ( n = 46) | 66 (57, 75) | 70 (63, 78) | 60 (50, 68) | 0.001 | |||
| Phenylephrine given | 68 (69) | 47 (73) | 21 (60) | 0.2 | 0.89 | 0.3–2.61 | 0.83 |
| Lowest body temperature (°C) | 30 (26, 32) | 32 (28, 32) | 27 (25, 30) | <0.001 | |||
| First 48 hours postoperatively (mean) | |||||||
| CVP | 12 (10, 14) | 11 (9, 13) | 13 (12, 15) | <0.001 | 4.27 | 1.48–12.3 | 0.007 |
| SBP | 105 (95, 114) | 107 (97, 114) | 101 (92, 111) | 0.1 | |||
| DBP | 58 (51, 62) | 60 (55, 64) | 52 (49, 59) | <0.001 | |||
| MAP | 73 (67, 77) | 75 (70, 78) | 68 (64, 75) | 0.001 | 4.9 | 1.07–22.5 | 0.04 |
| MPP | 61 (55, 67) | 64 (58, 68) | 56 (51, 61) | <0.001 | |||
| DPP | 47 (41, 52) | 50 (44, 54) | 42 (36, 47) | <0.001 |
Abbreviations: AKI, acute kidney injury; CVP, central venous pressure; DBP, diastolic blood pressure; DPP, diastolic perfusion pressure; IQR, interquartile range; MAP, mean arterial pressure; MPP, mean perfusion pressure; NIRS, near-infrared spectroscopy; SBP, systolic blood pressure.