Impact of BMI on stone clearance and surgical outcomes in retrograde intrarenal surgery: A comparative analysis across four BMI categories

OBJECTIVE: Retrograde Intrarenal Surgery (RIRS) is prevalent in the treatment of renal calculi. The effect of Body Mass Index (BMI) on stone clearance and surgical results has not yet been investigated extensively. This study sought to analyze the effect of BMI on clinical, procedural, and postoperative outcomes of patients undergoing RIRS. METHODS: ). The clinical and operative information was recorded from electronic data. Outcomes assessed included stone clearance, rates of complications, hospital stay, pain scores, and secondary intervention requirement. Statistics used were Chi-square tests, ANOVA/Kruskal-Wallis tests, and binary logistic regression. RESULTS: < 0.001), whereas BMI was not an independent predictor. CONCLUSION: RIRS is a safe and successful procedure in all BMI groups. Obese and overweight patients can have suboptimal results, especially regarding clearance of stones and postoperative recovery. Burden of stone continues to be the most important predictor of surgical success. The results indicate the necessity of personalized planning and follow-up, particularly in those with high stone burden or higher BMI.