Clinical characteristics for patients who did not develop AKI and those with and without AKI progression.

COPD, chronic obstructive pulmonary disease; SCr, plasma creatinine; eGFR, estimated glomerular filtration rate; IABP, intra-aortic balloon pump; CABG, coronary artery bypass grafting; CPB, cardiopulmonary bypass.Continuous variables were expressed as means ±SD.aAKI progression defined by worsening of AKIN stage from original diagnosis of AKI.bEstimate eGFR by the Chinese MDRD equation.cProteinuria by dipstick urinalysis, mild (trace or 1+) and heavy (≥2+).