Stavros Sfoungaristos1, Ofer N Gofrit2, Ioannis Mykoniatis3, Ezekiel H Landau2, Ioannis Katafigiotis4, Dov Pode2, Constantinos A Constantinides4, Mordechai Duvdevani2. 1. Department of Urology, Hadassah Hebrew University Medical Center, Ein-Kerem, 91120, Jerusalem, Israel. sfoungaristosst@gmail.com. 2. Department of Urology, Hadassah Hebrew University Medical Center, Ein-Kerem, 91120, Jerusalem, Israel. 3. 1st Urology Department, G. Gennimatas Hospital, Aristotle University, Thessaloniki, Greece. 4. 1st Urology Department, Laiko Hospital, University of Athens, Athens, Greece.
Abstract
PURPOSE: To externally validate Resorlu-Unsal stone score (RUSS) and to evaluate its predictive accuracy. METHODS: Data of patients who underwent retrograde intrarenal surgery (RIRS) between October 2013 and June 2015 were collected. RUSS was applied to all patients, and the nomogram was externally validated. Area under the curve (AUC) was used for clinical validity assessment. RESULTS: A total of 85 patients were included in the study. Mean patient age was 54.3 ± 16.5, and mean stone size was 12.0 ± 6.21 mm. After applying RUSS, 56.5, 28.2, 9.41, and 5.88 % had score 0, 1, 2, and 3, respectively. RUSS was significantly associated with stone location and size. Postoperative stone-free rate was 74.1 %. Postoperative outcomes were significantly associated with RUSS and stone size. RUSS was found to be the only significant independent predictor in multivariate analysis, while it provided high predictive accuracy with an estimated AUC of 0.707. CONCLUSIONS: RUSS is a simple scoring system that may predict postoperative stone-free rate after RIRS with great efficacy and accuracy.
PURPOSE: To externally validate Resorlu-Unsal stone score (RUSS) and to evaluate its predictive accuracy. METHODS: Data of patients who underwent retrograde intrarenal surgery (RIRS) between October 2013 and June 2015 were collected. RUSS was applied to all patients, and the nomogram was externally validated. Area under the curve (AUC) was used for clinical validity assessment. RESULTS: A total of 85 patients were included in the study. Mean patient age was 54.3 ± 16.5, and mean stone size was 12.0 ± 6.21 mm. After applying RUSS, 56.5, 28.2, 9.41, and 5.88 % had score 0, 1, 2, and 3, respectively. RUSS was significantly associated with stone location and size. Postoperative stone-free rate was 74.1 %. Postoperative outcomes were significantly associated with RUSS and stone size. RUSS was found to be the only significant independent predictor in multivariate analysis, while it provided high predictive accuracy with an estimated AUC of 0.707. CONCLUSIONS: RUSS is a simple scoring system that may predict postoperative stone-free rate after RIRS with great efficacy and accuracy.
Authors: Zhamshid Okhunov; Justin I Friedlander; Arvin K George; Brian D Duty; Daniel M Moreira; Arun K Srinivasan; Joel Hillelsohn; Arthur D Smith; Zeph Okeke Journal: Urology Date: 2013-03-26 Impact factor: 2.649