Acute kidney injury after colorectal surgery with an enhanced recovery pathway.

Dear Editor, In the recent article by Zorrilla-Vaca et al. [[1]] examining the risk factors of postoperative acute kidney injury (AKI) in patients undergoing colorectal surgery with an enhanced recovery pathway, we noted that several methodological issues were not addressed well. Third, by multivariable analysis, age > 60 years, male gender, American Society of Anesthesiologists physical status classifications III-IV, chronic kidney disease and hypoalbuminemia were identified as independent risk factors of postoperative AKI. As the diagnostic criteria of chronic kidney disease were not provided in the Methods section, it was unclear whether patients with occult or mild chronic kidney disease (stages 1 and 2) were included in the study. [Extracted from the article]