Table 2.
Regional tissue oximetry comparisons between the three AKI groups
| Variables | No AKI | Stage 1 AKI | Stage 2–3 AKI | P-value |
|---|---|---|---|---|
| N = 27 | N = 30 | N = 13 | ||
| BASELINE | ||||
| Renal rSO2 (%) | 67 (18) | 72 (14) | 66 (16) | 0.415 |
| Left cerebral rSO2 (%) | 59 (12) | 57 (10) | 62 (9) | 0.54 |
| Right cerebral rSO2 (%) | 61 (11) | 58 (11) | 63 (9) | 0.356 |
| INTRAOPERATIVE | ||||
| Average renal rSO2 (%) | 74 (11) | 78 (10) | 69 (12) | 0.075 |
| Nadir renal rSO2 (%) | 39 (28–65) | 49 (27–68) | 48 (19–58) | 0.499 |
| rSO2 <20% baseline, N (%) | 17 (65) | 17 (61) | 9 (82) | 0.476 |
| Average left cerebral rSO2 (%) | 62 (10) | 60 (10) | 62 (8) | 0.651 |
| Nadir left cerebral rSO2 (%) | 37 (11) | 37 (8) | 41 (9) | 0.435 |
| Average right cerebral rSO2 (%) | 63 (10) | 60 (9) | 63 (11) | 0.633 |
| Nadir right cerebral rSO2 (%) | 41 (13) | 40 (13) | 44 (11) | 0.668 |
| POSTOPERATIVE | ||||
| Average CICU renal rSO2 (%) | 84 (75–90) | 79 (72–88) | 66 (47–87) | 0.038* |
| Nadir CICU renal rSO2 (%) | 52 (16) | 46 (21) | 40 (19) | 0.22 |
Data presented as count (%), median (IQR), or mean (SD)
*
Stage 2–3 AKI had lower average CICU renal rSO2 than no AKI (P=0.016)
AKI - acute kidney injury; rSO2 – regional tissue oxygenation; CICU - cardiac intensive care unit