Prevalence, risk factors, clinical course, and outcome of acute kidney injury in Chinese intensive care units: a prospective cohort study.

(n=1623), younger than 18 years (n=127), receiving chronic hemodialysis (n=29), receiving renal transplantation (n=1) and unknown reasons (n=28). There were 1255 patients in the final analysis. AKI was diagnosed and classified according to RIFLE criteria. Results There were 396 patients (31.6%) who had AKI, with RIFLE maximum class R, I, and F in 126 (10.0%), 91 (7.3%), and 179 (14.3%) patients, respectively. Renal function deteriorated in 206 patients (16.4%). In comparison with non AKI patients, patients in the risk class on ICU admission were more likely to progress to the injury class (odds ratio (OR) 3.564, 95% confidence interval ( CI) 1.706 – 7.443, P = 0.001], while patients in the risk class (OR 5.215, 95% CI 2.798–9.719, P <0.001) and injury class (OR 13.316, 95% CI 7.507–23.622, P <0.001) had a significantly higher probability of deteriorating into failure class. The adjusted hazard ratios for 90-day mortality were 1.884 for the risk group, 3.401 for the injury group, and 5.306 for the failure group. Conclusions The prevalence of AKI was high among critically ill patients in Chinese ICUs. In comparison with non-AKI patients, patients with RIFLE class R or class I on ICU admission were more susceptibility to progression to class I or class F. The RIFLE criteria were robust and correlated well with clinical deterioration and mortality. Chin Med J 2013;126 (23): 4409-4416