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Erschienen in:
09.05.2016 | Urology - Original Paper
External validation of Resorlu–Unsal stone score as predictor of outcomes after retrograde intrarenal surgery
Erschienen in: International Urology and Nephrology | Ausgabe 8/2016
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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.