Extracorporeal shock wave lithotripsy for renal calculi

Area of Science:

• Pediatric Urology
• Nephrolithiasis Management
• Minimally Invasive Surgery

Background:

• Renal calculi in children pose unique management challenges.
• Extracorporeal shock wave lithotripsy (ESWL) is a common treatment modality.
• Understanding ESWL efficacy in pediatric populations is crucial for optimizing outcomes.

Purpose of the Study:

• To evaluate the efficacy of ESWL as monotherapy for renal calculi in children.
• To identify factors influencing the stone-free rate after ESWL in pediatric patients.

Main Methods:

• Retrospective review of pediatric patients undergoing ESWL for renal calculi (1988-2007).
• Analysis of clinical characteristics, stone size and location, lithotriptor type, and complications.
• Assessment of stone-free rates after one and two ESWL sessions.

Main Results:

• A 53% stone-free rate was achieved after one ESWL session, increasing to 63% after two sessions.
• Smaller stones (<50 mm²), renal pelvic location, and use of the Dornier HM3 lithotriptor were associated with higher stone-free rates.
• Larger stones (>100 mm²), caliceal location, and use of the Dornier MFL 5000 lithotriptor correlated with higher failure rates (25-46%).
• 8% of patients required ureteroscopy for retained fragments, and 8% needed subsequent endoscopic treatment for residual stones.

Conclusions:

• Smaller renal stones, pelvic calculi, and older generation lithotriptors are independent predictors of higher ESWL success in children.
• ESWL is a viable option for pediatric renal calculi, but primary endoscopic approaches may be superior for large or caliceal stones.