Endourology & Stone Disease(구연) Oral Session 6 / Endourology & Stone Disease (Ⅰ) (O-059) Crystal A (3F) 11월28일(수) 14:00-15:00 연성요관경을 이용한 신결석수술시 풍선확장술을 시행한 군과 시행하지 않은 군의 협착발생율 비교 삼성서울병원, 성균관대학교 의과대학 비뇨기과학교실 최중원, 전성수, 정병창, 백민기, 전황균, 성현환, 강민용, 한덕현 There is a concern that who conduct of the balloon dilatation at RIRS may be associated with the occurrence of ureteral stricture in the future. We try to find out what percentage of patients had balloon dilatation in RIRS, and whether there was a difference in the rate of stricture development. A retrospective analysis was performed on patients who performed RIRS at Samsung medical center. Patients were excluded who had a ureteral stricture operation prior to the RIRS, the recipient of the flexible ureterorenoscopic surgery associated with malignancy, and who received endoureterotomy on the day of surgery. The Mann-Whitney U test and Fisher's exact test were used for the analysis. Out of 749 patients, 708 patients were analyzed except 41 patients who were included in the exclusion criteria. 48 patients (6.8%) conducted balloon dilatation in RIRS and 660 (93.2%) received RIRS only. There was no difference between the two groups in the basic clinical characteristics. There was no difference in median operation time (RIRS only; 77.0min, RIRS+balloon; 75.5min, p=0.904) and the hospital day (2.83 and 2.84, p=0.412) in two groups. Only D-J retention period day (15.5 and 18.5, p=0.029) was higher in the RIRS+balloon group. There were no statistical differences in the ratio of balloon or surgery for stricture (2.3 and 4.2, p=0.322) and all additional procedure for stricture (3.0 and 4.2, p=0.656) in two groups. Balloon dilatation at RIRS has not affected the future stricture occurrence, and proper use of the balloon is considered a good option for RIRS. keywords : RIRS, Balloon, Stricture