Resultados obtenidos con nefrolitotomía percutánea y su correlación con las escalas de Guy y S.T.O.N.E. en un hospital de la Ciudad de México

Abstract

BackgroundPercutaneous nephrolithotomy (PNL) is a procedure with precise indications. An evaluation method for predicting the stone-free rate after PNL is needed. The Guy's stone score and the S.T.O.N.E. score are based on stone number and size, kidney anatomy, tract length, obstruction, the calyces involved, and Hounsfield units. AimTo evaluate the Guy's stone score and the S.T.O.N.E. score as stone-free rate predictors in percutaneous nephrolithotomy. Material and MethodsA retrospective study of patients managed with PNL within the time frame of January 2013 to June 2015 was conducted. The Guy's stone score and the S.T.O.N.E. score were evaluated as stone-free rate predictors. Statistical analysis was done using the chi-square test (SPSS). ResultsTwenty-two patients were included, 10 women (45%) and 12 men (55%), and their mean age was 44 years. The stone-free rate was 63%. The Guy's stone score was correlated with a stone-free rate (P=.04), whereas the S.T.O.N.E. score had no relation (P=.7). The absence of ectasia was correlated with a higher stone-free rate (42%). Eighty-five percent of the patients without nephrostomy at the time of surgery resulted stone-free. Mechanical energy was the most widely utilized form of energy for lithotomy, being used in 45% of the patients. One renal pelvis perforation and bleeding were the complications that prevented the procedure from being finished, but transfusion was not required. ConclusionsCorrelation was found with the Guy's stone score, but there was no statistically significant difference in the S.T.O.N.E. score. The Guy's stone score had statistical value, but a greater number of patients are needed to increase the correlation of the 2 scores in our hospital.