Retrospective analysis of retrograd intrarenal surgery results and factors affecting success rate

Purpose: we evaluated predictive factors for the successful retrograd intrarenal surgery by retrospectively scrutinizing patients treated with retrograde intrarenal surgery. materials and methods: records of 76 renal stone patients treated between april 2014 and november 2016 were analyzed. the medical history of the patients including laboratory and radiological findings as well as preoperative and postoperative data was analyzed. results: the mean age was 42.9±13.4 years. the mean stone number was 1.84±0.92 (total 135 stones). the mean stone size was 10.7±3.6 mm, and cumulative stone burden was 121.8±83.7 mm2. there were a total of 135 stones: 8 of them located in the upper calyx, 25 in middle calyx, 52 lower calyx, 26 in renal pelvis and 24 in the ureteropelvic junction. we controlled our stone-free rate with ct one month after the surgery. the success rate and complete stone-free rate was 77.6% after the first session. eleven patients had insignificant residual fragments, but 5 patients had residual stone. the total stone number, stone size and cumulative stone burden were found to be significant in the success of the surgery. major complications were urosepsis in one patient, hemorrhage requiring transfusion in one patient and ureteral trauma that recovered with dj placement and no need for open surgery in one patient. conclusion: rirs is an effective operation with high stone free rate and minimally invasive operation method with minimal morbidity and complication rate. stone number, stone size and cumulative stone burden are found to be main factors affecting success rate of the procedure.