Single-Stage Bilateral Versus Unilateral Retrograde Intrarenal Surgery for Management of Renal Stones: A Matched-Pair Analysis

Abstract Purpose: This study aimed to compare the effectiveness and safety of single-stage bilateral and unilateral retrograde intrarenal surgery (RIRS) for treatment of patients with renal stones. Patients and Methods: Patients undergoing single-stage bilateral RIRS for renal stones between January 2011 and April 2014 were retrospectively reviewed and matched to patients undergoing unilateral RIRS at a 1:1 ratio by the propensity score based on age, sex, body mass index, American Society of Anesthesiologists classification, stone burden, and stone location (involvement of the lower calix or not). Main outcome measures were stone-free rate per patient and per renal unit and RIRS-associated morbidity. Results: Of 60 patients treated by single-stage bilateral RIRS, 59 patients were matched with patients treated by unilateral RIRS. Stone-free rates per patient for bilateral RIRS and unilateral RIRS were 84.7% and 91.5%, respectively (P=0.255). Median operative time (100 vs 65 min, P<0.001) and postoperative ...