USA: Researchers have found in a new study that acute kidney injury (AKI) is a frequent complication following radical nephrectomy with inferior vena cava (IVC) thrombectomy. The majority of AKI cases are mild in severity and do not require dialysis. However, obesity significantly increases the risk of developing moderate to severe AKI after surgery, highlighting the importance of careful perioperative risk assessment and monitoring in obese patients.The findings, published in Urologic Oncology: Seminars and Original Investigations, are from one of the largest single-center cohorts to date examining renal outcomes after this complex surgery. The study was led by Alireza Ghoreifi from the Department of Urology, Duke University Medical Center, Durham, North Carolina, along with colleagues. The researchers evaluated patients who underwent radical nephrectomy combined with IVC thrombectomy for renal cell carcinoma (RCC) over 23 years from 2000 to 2023.In the retrospective analysis, 155 patients met the inclusion criteria after excluding those already receiving renal replacement therapy. The median age of participants was 65 years, and more than two-thirds were male. Postoperative AKI was defined and staged according to the Kidney Disease Improving Global Outcomes (KDIGO) criteria. The following were the key findings:Overall, 67% of patients developed acute kidney injury following surgery.Most cases were mild, with 48% classified as KDIGO stage 1.Moderate and severe AKI occurred less frequently, with 12% developing stage 2 and 7% progressing to stage 3.Despite the high incidence of AKI, serious renal outcomes were uncommon.Among patients with stage 2 or 3 AKI, only one required dialysis within 90 days after surgery, indicating favorable renal recovery in most cases.Multivariable logistic regression analysis was conducted after adjusting for age and coronary artery disease to identify predictors of more severe AKI.Obesity (BMI ≥ 30 kg/m²) was identified as an independent risk factor for moderate to severe AKI.Obese patients had nearly threefold higher odds of developing KDIGO stage 2 or 3 AKI compared to non-obese patients.The findings highlight obesity as a potentially modifiable risk factor in patients undergoing high-risk urologic oncology surgeries.Radical nephrectomy with IVC thrombectomy remains a technically demanding operation, often required for advanced RCC with tumor thrombus extension into the vena cava. Given the surgical complexity and hemodynamic challenges involved, postoperative kidney dysfunction is a significant concern.The authors concluded that while AKI is common after this procedure, it is usually mild and rarely necessitates dialysis. However, the clear link between obesity and more severe forms of AKI highlights the need for individualized perioperative strategies in obese patients. They emphasized the importance of optimized preoperative counseling, vigilant intraoperative management, and close postoperative renal monitoring in this subgroup.The researchers also called for prospective studies to confirm these findings and to explore targeted interventions aimed at reducing kidney-related complications in patients undergoing complex RCC surgeries.Reference:Ghoreifi, A., Dudinec, J. V., Ivey, M. C., Deivasigamani, S., Hunter, A. E., Moghaddam, F. S., Fantony, J. J., Williams, A. R., Inman, B. A., Melo, D. O., Shah, A. M., & Abern, M. R. (2026). Acute kidney injury following radical nephrectomy and inferior vena cava thrombectomy: A tertiary referral center experience. Urologic Oncology: Seminars and Original Investigations, 111029. https://doi.org/10.1016/j.urolonc.2026.111029