• Alexandre Joosten, Brigitte Ickx, Zakaria Mokhtari, Luc Van Obbergh, Valerio Lucidi, Vincent Collange, Salima Naili, Philippe Ichai, Didier Samuel, Sa CunhaAntonioADepartment of Hepato-biliary and Pancreatic Surgery, Assistance Publique Hôpitaux de Paris, Paul-Brousse Hospital, Centre Hépato-Biliaire, 12 Avenue Paul Vaillant Couturier, 94800, Villejuif, France., Brenton Alexander, Matthieu Legrand, Fabio Silvio Taccone, Anatole Harrois, Jacques Duranteau, Jean-Louis Vincent, Joseph Rinehart, and Philippe Van der Linden.
• Department of Anesthesiology, CUB Erasme, Université Libre de Bruxelles, 808 route de Lennik, 1070, Bruxelles, Belgium. Alexandre.Joosten@erasme.ulb.ac.be.
• BMC Anesthesiol. 2021 Apr 30; 21 (1): 135135.

BackgroundThe potential relationship between a mild acute kidney injury (AKI) observed in the immediate postoperative period after major surgery and its effect on long term renal function remains poorly defined. According to the "Kidney Disease: Improving Global Outcomes" (KDIGO) classification, a mild injury corresponds to a KIDIGO stage 1, characterized by an increase in creatinine of at least 0.3 mg/dl within a 48-h window or 1.5 to 1.9 times the baseline level within the first week post-surgery. We tested the hypothesis that patients who underwent intermediate-to high-risk abdominal surgery and developed mild AKI in the following days would be at an increased risk of long-term renal injury compared to patients with no postoperative AKI.MethodsAll consecutive adult patients with a plasma creatinine value ≤1.5 mg/dl who underwent intermediate-to high-risk abdominal surgery between 2014 and 2019 and who had at least three recorded creatinine measurements (before surgery, during the first seven postoperative days, and at long-term follow up [6 months-2 years]) were included. AKI was defined using a "modified" (without urine output criteria) KDIGO classification as mild (stage 1 characterised by an increase in creatinine of > 0.3 mg/dl within 48-h or 1.5-1.9 times baseline) or moderate-to-severe (stage 2-3 characterised by increase in creatinine 2 to 3 times baseline or to ≥4.0 mg/dl). The exposure (postoperative kidney injury) and outcome (long-term renal injury) were defined and staged according to the same KDIGO initiative criteria. Development of long-term renal injury was compared in patients with and without postoperative AKI.ResultsAmong the 815 patients included, 109 (13%) had postoperative AKI (81 mild and 28 moderate-to-severe). The median long-term follow-up was 360, 354 and 353 days for the three groups respectively (P = 0.2). Patients who developed mild AKI had a higher risk of long-term renal injury than those who did not (odds ratio 3.1 [95%CI 1.7-5.5]; p < 0.001). In multivariable analysis, mild postoperative AKI was independently associated with an increased risk of developing long-term renal injury (adjusted odds ratio 4.5 [95%CI 1.8-11.4]; p = 0.002).ConclusionsMild AKI after intermediate-to high-risk abdominal surgery is associated with a higher risk of long-term renal injury 1 y after surgery.

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