Redefining the limits of flexible ureterorenoscopy
Muddassar Hussain1, Peter Acher, Branamir Penev
1Maidstone Department of Urology, Maidstone & Tunbridge Wells NHS Trust, Maidstone Hospital, Maidstone, Kent, United Kingdom. muddassarhussain@doctors.org.uk
Journal of Endourology
|November 6, 2010
Summary
Flexible ureterorenoscopy with holmium laser lithotripsy effectively treats kidney stones up to 20 mm. Larger renal calculi (>20 mm) have reduced single-treatment success rates, indicating an optimal size limit for this procedure.
Area of Science:
- Urology
- Endourology
- Nephrolithiasis Management
Background:
- Flexible ureterorenoscopy (fURS) with holmium laser lithotripsy is a key treatment for renal calculi.
- This technique offers a retrograde approach for kidney stone management.
Purpose of the Study:
- To evaluate the impact of stone size, density, and location on treatment outcomes.
- To identify factors influencing the success of flexible ureterorenoscopic holmium laser lithotripsy.
Main Methods:
- Retrospective analysis of 185 patients undergoing 236 fURS holmium laser lithotripsy treatments.
- Single-treatment success defined by visual clearance, residual stone size (<2 mm on CT), and absence of further procedures.
Main Results:
- Overall success rate was 90.7%.
- Success rates were high for stones ≤ 20 mm (96.5%), but decreased significantly for larger stones (>20 mm).
- Stone density (Hounsfield units) and location did not significantly affect treatment outcomes.
Conclusions:
- Flexible ureterorenoscopy and holmium laser lithotripsy achieve >90% clearance for renal stones up to 20 mm.
- Single-procedure success is limited for stones exceeding 20 mm.
- Stone size is the primary determinant of treatment success, not density or location.
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