Abstract
IntroductionPercutaneous Nephrolithotomy (PCNL) is currently the treatment of choice in large kidney stones. Guýs stone score was developed to predict treatment outcomes. The aim of this study was to evaluate the relationship between Guýs score and outcomes in our institution. Materials and MethodsThe medical records of patients diagnosed with urolithiasis and treated by PCNL were retrospectively evaluated between January 2017 and December 2018. Analyzed data included: age, sex, Guy's score based on preoperative findings, transfusion, stone-free rate and requirement of auxiliary procedures. Chi-square test was used for the comparison of proportions. Odds ratios (OR) with confidence intervals (CIs) of 95% were calculated by logistic regression. ResultsA total of 386 patients, 53.89% female, mean age of 45.59±15 years were analyzed. Guy's score was as follows: 112 patients (29.04%) were classified as Guy I, 92 patients (23.82%) as Guy II, 94 patients (24.34%) as Guy III, and 88 patients (22.80%) as Guy IV. There were no differences between groups in terms of blood transfusions. Stone-free rate was 96.43% (n=108) for patients Guy I; 84.78% (n=72) for Guy II; 76.59% (n=72) for Guy III and 50% (n=44) for Guy IV categories (p <0.0001). Taking as a reference Guy I group, the OR to require new treatment for residual stones were: Guy II 4.85 (CI=0.95 to 24.60, P=0.05) to Guy III 8.25 (CI=1.73 to 39.44, P=0.008) and Guy IV 27 (CI=5.84 to 124.70; p <0.0001). ConclusionThere was a statistically significant association between Guýs Score and stone-free rates following PCNL. Guy's score was useful to predict results of PCNL in our group.
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