IN recent article by Turan et al., we noted several issues that were not well addressed.

First, according to the Kidney Disease Improving Global Outcomes program, a criterion of serum creatinine greater than1.5 mg/dl or estimated glomerular filtration rate less than 60 ml · min−1 · 1.73m−2 used in this study only excluded moderate and severe chronic kidney disease (stages 3 to 5), but not occult or mild chronic kidney disease (stages 1 and 2), which has been identified as an independent risk factor for postoperative acute kidney injury (AKI) and progressive chronic kidney disease. Furthermore, it was unclear why preoperative serum creatinine and estimated glomerular filtration rate were not included in baseline characteristics of patients and compared between patients with and without AKI. Thus, this study cannot exclude the possibility that...

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