title: Modified Seoul National University Renal Stone Complexity score for retrograde intrarenal surgery.
abstract: The Seoul National University Renal Stone Complexity (S-ReSC) score is a well-validated tool for the prediction of stone-free rate (SFR) after percutaneous nephrolithotomy. We modified the S-ReSC score system for application to retrograde intrarenal surgery (RIRS) and evaluated this score. A total of 88 patients who underwent RIRS from 2011 to 2013 were included. The modified S-ReSC score was assigned according to the number of sites involved in the renal pelvis (#1), superior and inferior major calyceal groups (#2-3), and anterior and posterior minor calyceal groups of the superior (#4-5), middle (#6-7), and inferior calyx (#8-9). If the stone was in the inferior sites (#3, #8-9), one additional point per site was added to the original score. The SFR was examined according to the modified S-ReSC score. To evaluate the predictive accuracy, the area under the receiver operating characteristic curve (AUC) was used and compared with the Resorlu-Unsal Stone (RUS) score. The SFR was 85.2% and was significantly decreased in the order of low (1-2: 94.2%), medium (2-4: 84.0%), and high (>4: 45.5%) modified ReSC score groups (p < 0.001). AUCs of the modified S-ReSC score (0.806) and score group (0.766) were higher than the AUC of the RUS score (0.692; p = 0.012 and p = 0.040, respectively). The modified S-ReSC score predicts the SFR after RIRS well. Furthermore, its predictive accuracy is higher than that of the RUS score.
authors.affiliation: Department of Urology, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Jin-Woo
authors.initials: JW
authors.lastname: Jung
authors.forename: Byung Ki
authors.initials: BK
authors.lastname: Lee
authors.forename: Yong Hyun
authors.initials: YH
authors.lastname: Park
authors.forename: Sangchul
authors.initials: S
authors.lastname: Lee
authors.forename: Seong Jin
authors.initials: SJ
authors.lastname: Jeong
authors.forename: Sang Eun
authors.initials: SE
authors.lastname: Lee
authors.forename: Chang Wook
authors.initials: CW
authors.lastname: Jeong
mesh_terms: D000328:Adult; D000368:Aged; D019540:Area Under Curve; D005260:Female; D006801:Humans; D007669:Kidney Calculi / Q000601:surgery*; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D018666:Ureteroscopy