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Which is Better? Guy’s vs S.T.O.N.E. Nephrolithometry Scoring Systems in Predicting Stone-Free Status Post-Percutaneous Nephrolithotomy
• 2015
Publication Information
Authors
Yasser Noureldin, Mohamed Elkoushy, Sero Andonian
Keywords
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Journal
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Pages
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publication.type
International
Paper Link
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Supplementary Materials
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Abstract
INTRODUCTION AND OBJECTIVES: Both Guy’s (GSS) and S.T.O.N.E. Nephrolithometry Scoring Systems have been
recently validated as predictors of stone-free status post-Percutaneous Nephrolithotomy (PCNL). Therefore, the aim of the present
study was to compare the accuracy of the GSS and S.T.O.N.E. scoring systems in predicting PCNL outcomes.
METHODS: After obtaining ethics approval, medical records of patients undergoing PCNL between 2009 and 2013 at a
tertiary stone referral centre were retrospectively reviewed. GSS and S.T.O.N.E. Nephrolithometry scores were calculated. Logestic
regression analysis and ROC curves were generated to compare accuracy of each scoring system.
RESULTS: A total of 185 PCNLs were reviewed. Mean patient age was 55.2±14 years with mean body mass index of
27.8±6.2 kg/m2 and mean operative time of 98.7±34.2 minutes. The overall stone-free rate was 71.9% with complication rate of
16.2%. When compared with patients with residual fragments, stone-free patients had significantly lower Guy’s Score (2.7 vs 2; p
p
recently validated as predictors of stone-free status post-Percutaneous Nephrolithotomy (PCNL). Therefore, the aim of the present
study was to compare the accuracy of the GSS and S.T.O.N.E. scoring systems in predicting PCNL outcomes.
METHODS: After obtaining ethics approval, medical records of patients undergoing PCNL between 2009 and 2013 at a
tertiary stone referral centre were retrospectively reviewed. GSS and S.T.O.N.E. Nephrolithometry scores were calculated. Logestic
regression analysis and ROC curves were generated to compare accuracy of each scoring system.
RESULTS: A total of 185 PCNLs were reviewed. Mean patient age was 55.2±14 years with mean body mass index of
27.8±6.2 kg/m2 and mean operative time of 98.7±34.2 minutes. The overall stone-free rate was 71.9% with complication rate of
16.2%. When compared with patients with residual fragments, stone-free patients had significantly lower Guy’s Score (2.7 vs 2; p
p