Table 1.
Comparison of clinical characteristics between non-acute kidney injury group and acute kidney injury group within 48 h
| Non-AKI group, n = 66 | AKI group, n = 24 | t/χ2 value | P value | |
| Age in yr | 65.38 ± 12.93 | 66.92 ± 10.24 | 0.526 | 0.600 |
| Gender, male/female | 36/30 | 14/10 | 0.102 | 0.749 |
| BMI in kg/m2 | 22.72 ± 3.82 | 23.01 ± 2.98 | 0.336 | 0.738 |
| APACHE II | 20.91 ± 3.52 | 21.27 ± 3.38 | 0.433 | 0.666 |
| MAP in mmHg | 78.73 ± 8.39 | 77.38 ± 9.21 | 0.658 | 0.512 |
| SIRS | 2.25 ± 0.53 | 2.58 ± 0.75 | 2.325 | 0.022 |
| Lac in mmol/L | 2.43 ± 1.02 | 3.01 ± 1.33 | 2.193 | 0.031 |
| ScvO2 | 0.71 ± 0.05 | 0.72 ± 0.04 | 0.882 | 0.380 |
| CRP in mg/L | 158.34 ± 63.82 | 167.28 ± 48.92 | 0.622 | 0.535 |
| SAA in mg/L | 358.83 ± 89.93 | 325.18 ± 72.02 | 1.649 | 0.103 |
| Scr in μmol/L | 91.43 ± 23.92 | 141.82 ± 27.19 | 8.519 | 0.000 |
| BUN in mmol/L | 3.22 ± 1.03 | 4.41 ± 0.81 | 5.108 | 0.000 |
| 24 h urine volume in mL | 2062.63 ± 227.83 | 2002.52 ± 201.63 | 1.140 | 0.258 |
| PI in dB | 20.72 ± 8.27 | 10.78 ± 3.98 | 5.640 | 0.000 |
| RT in s | 8.37 ± 3.82 | 10.23 ± 2.63 | 2.199 | 0.030 |
| WIS in dB/s | 1.73 ± 0.82 | 1.07 ± 0.53 | 3.667 | 0.000 |
| TPH | 61.82 ± 21.82 | 58.32 ± 18.89 | 0.696 | 0.488 |
| AUC | 1083.28 ± 482.72 | 937.92 ± 392.73 | 1.323 | 0.189 |
BMI: Body mass index; APACHE II: Acute physiological chronic health status scoring system II; MAP: Mean arterial pressure; ScvO2: Central venous oxygen saturation; SIRS: Systemic inflammatory response score; Lac: Lactic acid; CRP: C-reactive protein; SAA: Serum amyloid A; Scr: Serum creatinine; BUN: Blood urea nitrogen; PI: Peak intensity; RT: Rise time; WIS: Wash in slope; TPH: Peak to one half; AUC: Area under the curve.