Table 4.
Postoperative outcomes
| Total (n = 729) | All patients (n = 729) | P value | AKI patients (n = 188) | P value | |||
|---|---|---|---|---|---|---|---|
| Without postoperative AKI (n = 541) | With postoperative AKI (n = 188) | Preoperative albumin ≥37.5 g/L (n = 90) | Preoperative albumin < 37.5 g/L (n = 98) | ||||
| On MV in ICU | 390 (53.6%) | 268 (49.6%) | 122 (64.9%) | < 0.001 | 51 (56.7%) | 71 (72.4%) | 0.024 |
| Duration of MV (h) a | 26.9 (19.8, 34.0) | 14.7 (11.1, 18.3) | 53.4 (33.0, 73.8) | < 0.001 | 55.4 (21.5, 89.4) | 51.9 (26.5, 77.4) | 0.835 |
| Length of ICU stay (d) b | 2.5 (2.3, 2.8) | 2.0 (1.8, 2.3) | 4.0 (3.1, 4.9) | < 0.001 | 3.4 (2.1, 4.8) | 4.5 (3.3, 5.7) | 0.027 |
| Number of postoperative complications except AKI c | 0 (0, 1) | 0 (0, 0) | 0 (0, 2) | < 0.001 | 0 (0, 1) | 1 (0, 3) | < 0.001 |
| Postoperative hospital stay (d) d | 13.7 (12.6, 14.8) | 12.3 (11.3, 13.3) | 17.8 (14.8, 20.9) | < 0.001 | 16.9 (11.8, 22.0) | 18.7 (15.2, 22.2) | 0.158 |
| In-hospital mortality | 14 (1.9%) | 1 (0.2%) | 13 (6.9%) | < 0.001 | 2 (2.2%) | 11 (11.2%) | 0.020 |
| Total cost (10,000 dollars) | 1.2 (0.7, 1.7) | 1.1 (0.6, 1.6) | 1.3 (0.9, 2.0) | < 0.001 | 1.2 (0.6, 1.8) | 1.5 (1.0, 2.2) | 0.011 |
Data are presented as number of patients (percentage), or median (interquartile range), unless otherwise indicated
ICU intensive care unit, MV mechanical ventilation
a Results of patients requiring postoperative mechanical ventilation. Data were analyzed by Kaplan-Meier analysis and compared by log-rank test; results are presented as average (95% confidence interval);
b Result of patients admitted to ICU. Data were analyzed by Kaplan-Meier analysis and compared by log-rank test; results are presented as average (95% confidence interval)
c Including pulmonary infection, pleural effusion, atelectasis, respiratory failure, acute myocardial infarction, congestive heart failure, new-onset arrhythmia, hemodynamic insufficiency, stroke, venous thromboembolism, ileus, intra-abdominal abscess, wound infection, urinary tract infection, sepsis, surgical bleeding, digestive tract bleeding, acute liver injury, disseminated intravascular coagulation, anastomotic leakage, and wound dehiscence [see Additional file 2: Table S2]
d Data were analyzed by Kaplan-Meier analysis and compared by log-rank test; results are presented as average (95% confidence interval)