Methods
This is an observational retrospective cohort study done at King Abdulaziz University Hospital in Jeddah, Saudi Arabia approved by ethical committee. The exclusion criteria were baseline serum creatinine (SCr) ≥ 4 mg/dL or preexisting renal failure requiring dialysis, reoperation, death within 24 hours postoperatively, and operative mortality or missing data. 941 patients were included in the analysis using the statistical software SPSS , version 15.0.