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External validation and comparison of the scoring systems (S.T.O.N.E,GUY, CROES,S-ReSC) for predicting percutaneous nephrolithotomy outcomes for staghorn stones: A single center experience with 160 cases
Authors:Serkan Yarimoglu  Ibrahim Halil Bozkurt  Ozgu Aydogdu  Tarik Yonguc  Ertugrul Sefik  Yusuf Kadir Topcu  Tansu Degirmenci
Affiliation:1. Department of Urology, Igd?r Central Hospital, Igd?r, Turkey;2. Department of Urology, Bozyaka Training and Research Hospital, Izmir, Turkey
Abstract:The aim of this study was validation and comparison of stone scoring systems (S.T.O.N.E, GUY, CROES, S-ReSC) used to predict postoperative stone-free status and complications after percutaneous nephrolithotomy (PCNL) for staghorn stones. A total of 160 patients who had staghorn renal stones and underwent PCNL between January 2012 and August 2015 were included in the current retrospective study. Guy, S.T.O.N.E., S-ReSC (Seoul National University Renal Stone Complexity) and CROES (Clinical Research Office of the Endourological Society) nephrolithometry scores were calculated for each patient, and their potential association with stone-free status, operative and fluoroscopy time, and length of hospital stay (LOS) were evaluated. Postoperative complications were graded according to the modified Clavien classification, and the correlation of scoring systems with postoperative complications was also investigated. The mean CROES, S.T.O.N.E, Guy and S-ReSC scores were 143.5 ± 33.6, 9.7 ± 1.6, 3.5 ± 0.5 and 6.2 ± 2.0 respectively. The overall stone-free rate was 59%. All scoring systems were significantly correlated with stone-free status in univariate analysis. However, Guy and S-ReSC scores were the only significant independent predictor in multivariate analysis. And all four nomograms failed to predict complication rates. Current study demonstrated that Guy and S-ReSC scoring systems could effectively predict postoperative stone-free status for staghorn stones. However all four scoring systems failed to predict complication rates.
Keywords:Percutaneous nephrolithotomy  Guy scoring system  CROES scoring system  S.T.O.N.E. scoring system  S-ReSC scoring system
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