Mizota T, et al. - Researchers examined the link between intraoperative urine output during major abdominal surgery and postoperative acute kidney injury (AKI) development in this retrospective cohort analysis. They also tried to define an optimal threshold for foretelling the differential risk of AKI. They retrospectively obtained perioperative data from 3,560 patients undergoing major abdominal surgery (liver, colorectal, gastric, pancreatic, or oesophageal resection) at Kyoto University Hospital. In the study sample, the overall incidence of AKI was estimated to be 6.3%. Findings revealed a significant link between intraoperative oliguria < 0.3 ml kg⁻¹ h⁻¹ and increased risk of postoperative AKI in patients undergoing major abdominal surgery. A significantly improved risk stratification for AKI was achieved by adding oliguria < 0.3 ml kg⁻¹ h⁻¹ to a model with conventional risk factors.