Prediction of the stone free rate by using the guy's stone score after percutaneous nephrolithotomy

Abstract

Background: Urolithiasis is one of the common diseases of the urinary system, with an incidence of approximately 5-10% among the general population. Among the minimally invasive surgeries, percutaneous nephrolithotomy (PCNL) is the gold standard therapy for large and/or complex renal stones.

Objective: The study was carried out to predict the stone-free rate after PCNL by using the Guy's stone score.

Methods: This prospective cross-sectional study was conducted in the Department of Urology, Bangabandhu Sheikh Mujib Medical University, (BSMMU), Dhaka from February 2016 to January 2017. The patients with renal stone attending the outpatient department who met the criteria of standard PCNL.

Results: Atotal of 52 patients with renal stone were included in this study.  The mean age was to be found 45.3±14.0 with range of 18 to 73 years. Male to female ratio was 3.3:1. Almost three fourth (74.5%) patients had normal body mass index. All patients had normal anatomy. More than half 27 of the (51.9%) patients had found grade I, 10 (19.2%) Grade II, 11(21.2%) Grade III and 4 (7.7%) Grade IV. Nearly two third 34 (65.4%) patients were found total stone cleared and 18(34.6%) had residual stone. Cleared stone was found 23(85.2%) in grade I, 7(70.0%) grade II, 3(27.3%) in grade III and 1(25.0%) in grade IV.

Conclusion: Based on the study findings, it may be concluded that higher the GSS less the stone free rate.It will help in better patient counseling preoperatively, and to predict the need for ancillary treatment.