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Comparing biopsies in elderly and younger adults, elderly individuals were more likely to be hypertensive (83.8% versus 46.2%, p<0.001). Indications for biopsy were not significantly different between elderly and younger adults (all p >0.05): proteinuria and hematuria (49.5% vs. 50.2%), nephrotic syndrome (27.5% vs. 25.4%), isolated proteinuria (22.1% vs. 22.2%), isolated microscopic or macroscopic hematuria (0.9% vs. 0.8%), chronic renal impairment (0 vs 0.8%) and acute kidney injury (0 vs. 0.6%).

Objectives Cytoreductive surgery combined with hyperthermic intraperitoneal chemotherapy (CRS-HIPEC) has been established in the management of peritoneal carcinomatosis. Although it is still necessary to take adequate measures against major postoperative complications including acute kidney injury (AKI), consensus is lacking on how to assess and stratify risk for patients with postoperative AKI after CRS-HIPEC. The aim of this retrospective cohort study was to investigate the association of intraoperative gross hematuria as a surrogate marker of ureter injury with postoperative AKI incidence. Methods This retrospective cohort study investigated patients without impaired preoperative kidney function who underwent CRS-HIPEC at a single referral center, and evaluated the relationship between intraoperative gross hematuria and incidence of postoperative AKI as defined by the Kidney Disease Improving Global Outcomes practice guidelines. Logistic regression analysis was performed to calculate the odds ratio of intraoperative gross hematuria for AKI, adjusting for confounding factors and other risk factors for AKI. Results We enrolled 185 patients (males, 37%). Twenty-five patients developed intraoperative gross hematuria. Postoperative AKI occurred in 10 (40%) of 25 patients with hematuria and 28 (17.5%) of 160 patients without hematuria. The crude odds ratio for exposure to hematuria was 3.14 (95% confidence interval, 1.30–7.60; p=0.020) for postoperative AKI. Adjusted odds ratio as estimated by multivariate logistic regression was 4.57 (95% confidence interval, 1.55–13.45; p=0.006). Conclusions Intraoperative gross hematuria is significantly associated with postoperative AKI incidence after CRS-HIPEC.

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