Table 3. Urine oxygen tension, systemic oxygen tension and urine output at the four measurement time points.
Time points: T1, immediately after induction of general anesthesia in the operating room; T2, immediately after intensive care unit (ICU) admission; T3, 6 hours after ICU admission; T4, 12 hours after ICU admission.
Data are shown as means ± SD.
* Urine output of T1 was calculated using the urine output from the insertion of the urethral catheter to the start of cardiopulmonary bypass, and the urine output of T2 was calculated using the urine output from the start of cardiopulmonary bypass to ICU admission.
PuO2: urine oxygen tension; PaO2: systemic oxygen tension
| Variable | All patients (n = 50) | No AKI (n = 38) | AKI (n = 12) | P value |
| PuO2 (mmHg) | ||||
| T1 | 128 ± 29 | 126 ± 29 | 133 ± 31 | 0.45 |
| T2 | 122 ± 24 | 122 ± 19 | 124 ± 37 | 0.80 |
| T3 | 132 ± 26 | 136 ± 22 | 118 ± 33 | 0.03 |
| T4 | 128 ± 29 | 132 ± 26 | 116 ± 33 | 0.10 |
| PaO2 (mmHg) | ||||
| T1 | 214 ± 97 | 208 ± 99 | 234 ± 90 | 0.42 |
| T2 | 154 ± 49 | 153 ± 47 | 160 ± 58 | 0.66 |
| T3 | 125 ± 29 | 126 ± 31 | 123 ± 25 | 0.72 |
| T4 | 109 ± 25 | 107 ± 19 | 116 ± 39 | 0.32 |
| Urine output* (ml/min) | ||||
| T1 | 1.0 ± 0.8 | 1.1 ± 0.9 | 0.7 ± 0.5 | 0.14 |
| T2 | 1.4 ± 1.2 | 1.5 ± 1.3 | 1.1 ± 0.8 | 0.30 |
| T3 | 1.4 ± 0.6 | 1.5 ± 0.6 | 1.2 ± 0.5 | 0.11 |
| T4 | 2.1 ± 0.8 | 2.3 ± 0.8 | 1.6 ± 0.4 | 0.01 |