Shock-wave Lithotripsy for Pediatric Patients: Which Nomogram Can Better Predict Postoperative Outcomes?

To evaluate and to compare the accuracy of the Onal and Dogan nomograms for prediction of stone-free rate after shock-wave lithotripsy (SWL) in children.

We retrospectively analyzed the medical records of children <18 years old who had been treated with SWL for kidney stone in our department between January 2014 and December 2016. A single observer reviewed the records and both Onal and Dogan nomograms were calculated and compared with respect to their predictive capability for stone-free status.

A total of 219 patients with a mean age of 82.7 months fulfilled the study inclusion criteria. In patients who were stone free and those with residual stones after completion of the first session, the mean Onal score was 2.83 and 4.12 (P = .01), and the mean Dogan score was 120.87 and 167.44 (P = .01), respectively. In patients who were stone free and those with residual stones after the third session, the mean Onal score was 3.02 and 4.14 (P = .01), respectively. Multivariate regression analysis identified both Onal and Dogan nomograms as independent preoperative factors for SWL outcome in pediatric patients (P = .001 and P = .001) CONCLUSION: Our study demonstrates that Onal and Dogan nomograms are independent predictors of stone-free rate following SWL in pediatric patients.