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Objective: We aimed to investigate the effectiveness of shock wave Lithotripsy (SWL) and factors affecting seance number while treating children with renal stones. Materials and Methods: A total of 50 children (53 renal units) who underwent SWL for renal stones between 2012 and 2014 were investigated retrospectively. The demographics of patients, the number, size, side, location, and radiolucency of stones in kidneys, placement of JJ stents, shock number, energy, seance number, stone-free rate, and complications were noted. Results: Patients involved 25 girls and 25 boys with a median age of 4.0 years ranging from eight months to 16 years (21≤3y). Stones were located in the renal pelvis and calyxes in 20 and 33 patients, respectively. Of the renal stones, 33 were single and 20 were multiple. The mean stone size was 11.02±5.4 mm. Success rates were 45.3, 75.5, and 92.5% after seances 1, 2, and 3, respectively. Per seance, the mean SWL shock waves and energy were 1219±262 and 12.6±0.9 kV. A significant relationship was found between the need for a third seance and patient age (≤3 years and >3), radiolucent and radiopague, ≤10 mm and >10 mm or single and multiple stone (p<0.05). However, no significant relationship was found between success rate and age; sex; number, size, location, and side of stones; and radiolucent stones. Conclusions: Age, radiolucency, stone size, and number of stones were significant predictors of SWL success in children. We observed that stone-free status is achieved more quickly, even within the first or second SWL seances by significantly decreasing the need for the third séance in group age ≤3 years, radiolucent, ≤10 mm or single renal stones.

Factors Affecting the Number of Shock Wave Lithotripsy Session in Children with Renal Stones: Are age and Radiolucency the Predictors of Success?