Category: Clinical Stones: Outcomes

MP8-14 - Treatment outcomes of stone-free rate of retrograde intrarenal surgery for lower pole renal calculi

Fri, Sep 21
10:00 AM - 12:00 PM

Introduction & Objective :

Retrograde intrarenal surgery (RIRS) is well established and recommended in AUA & EAU guideline as the 1st line treatment for renal calculi, especially in stone size lesser than 20 mm for non-lower pole kidney stone but for the lower pole kidney stone the recommended stone size for RIRS is still lack of clear evidences of which are the most important factors to predict stone-free status after RIRS.
The purpose of this review is to provide recent data on the outcome of stone-free rate following RIRS for lower pole renal calculi.

Methods :

This review was retrospectively analyzed the data of procedures from patients with lower pole renal calculi who underwent RIRS between June 2012 and April 2017 at a single institute, Siriraj hospital.

Data of 103 procedures with lower pole renal calculi from all 423 procedures that was done in Siriraj hospital
including demographic data, stone size, stone free rate, complications and auxiliary procedure were reviewed.

Success rate was evaluated by using plain KUB film or ultrasonography.
Patient who have no residual stone or stone size lesser than 2 mm without stone associated symptom within 3 months after procedure was considered as successful treatment.

Results :

The total outcomes of stone-free rate following RIRs in lower pole renal calculi is 59.2%
When compared by stone size, the result show that patients with stone burden under 20 mm had a high rate of stone-free status after surgery
about 70% while result of stone-free rate in stone size larger than 20 mm was about 42.9%

Conclusions :

RIRs is an effective treatment in lower pole renal calculi with high success rate and the most relevant predictor for residual stone is the stone size greater than 20 mm with statistically significant odd ratio 3.185

Rawin Sawanaporn

resident in-training
Siriraj hospital, Mahidol university
Bangkok, Krung Thep, Thailand

Varat Woranisarakul

siriraj hospital, mahidol university
Bangkok, Krung Thep, Thailand

Ekkarin Chotikawanich

Siriraj hospital, Mahidol university
Bangkok, Krung Thep, Thailand