Mp06-04 miniaturized Ambulatory Percutaneous Nephrolithotomy (Mini-Pcnl) Versus Flexible Ureteroscopy(f-Urs) in the Management of Lower Calyceal Renal Stones 10- 20mm: A Propensity Score Matching Analysis

Abstract

INTRODUCTION AND OBJECTIVE: To compare the effectiveness of Mini-PCNL and F-URS in treating 10-20 mm lower calyceal stones using a logistic regression model with propensity score matching (PSM) to create similar patient groups for accurate comparison METHODS: We carried out a retrospective analysis of adult patients that underwent Mini-PCNL or F-URS at our institution from September 2018 to December 2019 Patients were discharged on the same day of their procedure. A non-contrast helical CT was performed at 3 months postoperatively to detect residual stones accurately. Patients' clinical characteristics, stone demographics, and perioperative outcomes were collected and statistically analyzed RESULTS: After PSM, 60 patients from the F-URS cohort were matched to 60 similar patients from the Mini-PCNL group. The results of clinical characteristics and postoperative outcomes following PSM are listed in Table 1. The stone-free rate (SFR) after PSM was not significantly higher in the Mini-PCNL group than the F-URS group (91.7% vs. 81.7%, respectively p[0.1). The median operative time for the F-URS group was significantly shorter than the , respectively p[0.045 Table 1.CONCLUSIONS: Ambulatory Mini-PCNL and F-URS have a comparable hospital stay, SFR, and complication rates for treating lower calyceal stones 10-20mm. Both techniques may be considered acceptable treatment options, with a prolonged operative time in Mini-PCNL.