Optimizing pediatric shock wave lithotripsy: stepwise energy escalation vs. conventional fixed energy

Area of Science:

• Pediatric Urology
• Nephrolithiasis Treatment
• Minimally Invasive Surgery

Background:

• Pediatric extracorporeal shock wave lithotripsy (ESWL) is a common treatment for kidney stones in children.
• The optimal energy delivery strategy for pediatric ESWL is not well-established.
• Adult studies suggest stepwise energy escalation may improve outcomes and reduce tissue injury.

Purpose of the Study:

• To compare the effectiveness and safety of a stepwise energy escalation protocol versus a conventional fixed-energy protocol for pediatric ESWL.
• To evaluate stone-free status, number of sessions, and complications in children undergoing ESWL.

Main Methods:

• Retrospective cohort study of 81 children treated with ESWL.
• Two protocols were compared: stepwise energy escalation (starting at 10 kV, increasing by 1 kV every 250 shocks up to 13 kV) and conventional fixed energy (13 kV).
• Primary outcome was 3-month stone-free status; secondary outcomes included first-session stone-free status, sessions needed, and complications.

Main Results:

• Higher stone-free rates after the first session were observed with the stepwise protocol (73.2%) compared to the conventional protocol (55.0%).
• At 3 months, stone-free rates were 95.1% for stepwise versus 87.5% for conventional.
• The stepwise protocol resulted in more children achieving clearance in a single session and required fewer auxiliary procedures, with no significant difference in complications.

Conclusions:

• Stepwise energy escalation in pediatric ESWL is associated with numerically higher stone clearance and fewer treatment sessions.
• This approach appears safe and does not increase treatment-related morbidity.
• Prospective, multicenter studies are warranted to validate these findings.