Impact of postoperative acute kidney injury on predicting the upstaging of chronic kidney disease after robot‐assisted partial nephrectomy

Introduction The aim of our study was to assess the impact of acute kidney injury (AKI) on postoperative upstaging of chronic kidney disease (CKD) after robot‐assisted partial nephrectomy (RAPN). Methods This study consisted of 110 patients who had undergone RAPN and were followed up for at least 6 months after surgery. Patients were classified as AKI or non‐AKI based on their serum creatinine level and estimated glomerular filtration rate within 7 days after surgery. Patient characteristics, outcome of RAPN and estimated glomerular filtration rate, and CKD upstage 6 months after surgery were compared between the AKI and non‐AKI groups. Results A total of 26 patients (23.6%) experienced AKI after surgery. RENAL (radius, exophytic/endophitic properties, nearness of the tumor to the collecting system or sinus, anterior/posterior, location relative to the polar lines) nephrometry scores were ≥7 for 22 (84.6%) in the AKI group and 39 (46.4%) in the non‐AKI group (P = .0006). A significantly smaller proportion of patients in the AKI group than in the non‐AKI group recovered 90% of baseline function (38.5% vs 81.0%, P