Table 4.
Postoperative outcomes based on cutoff value for mean rScO2.
| Postoperative Outcome | High Mean rScO2 | Low Mean rScO2 * | p-Value |
|---|---|---|---|
| Acute kidney injury, n | 45 (16.1%) | 98 (32.6%) | <0.001 |
| Stage of acute kidney injury ** | <0.001 | ||
| Stage 1, n | 41(14.7%) | 85 (28.2%) | |
| Stage 2, n | 2 (0.7%) | 5 (1.7%) | |
| Stage 3, n | 2 (0.7%) | 8 (2.7%) | |
| Cerebrovascular accident, n | 0 (0.0%) | 11 (3.7%) | 0.001 |
| Delirium, n | 31 (11.1%) | 68 (22.6%) | <0.001 |
| Re-operation, n | 4 (1.4%) | 6 (2.0%) | 0.754 |
| Sternal infection, n | 2 (0.7%) | 6 (2.0%) | 0.289 |
| Mechanical ventilation > 24 h, n | 10 (3.6%) | 9 (3.0%) | 0.688 |
| Myocardial infarction, n | 6 (2.2%) | 12 (4.0%) | 0.203 |
| 30-day or in-hospital mortality, n | 1 (0.4%) | 7 (2.3%) | 0.070 |
| Intensive care unit days, day | 3 (3–3) | 3 (3–4) | 0.007 |
| Hospital days after surgery, day | 8 (7–10) | 9 (8–12) | <0.001 |
Values are presented as the number of patients (%) or median (interquartile range). p-values obtained when comparing the high mean rScO2 group to the low mean rScO2 group. * Low mean rScO2 was defined as rScO2 < 58.5% and the optimal cutoff value for the mean rScO2 was determined by AUROC analysis and the Youden’s index. ** Acute kidney injury staging 1 to 3 according to the classification proposed by Kidney Disease: Improving Global Outcomes (KDIGO). rScO2: regional cerebral oxygen saturation.