Predictive value of a new scoring system for the outcome of primary in situ experimental extracorporeal shock wave lithotripsy of upper ureteral calculi.

The results of primary in situ extracorporeal shock wave lithotripsy of upper ureteral calculi were analyzed retrospectively in 491 eligible patients. The treatment was successful in 371 patients (76%). Degree of obstruction, stone size, localization of stone, history of previous ipsilateral surgery, and body mass index were found to be factors that can influence the outcome of treatment. A scoring system based on these factors has been developed to select the appropriate group of patients for primary in situ extracorporeal shock wave lithotripsy of upper ureteral calculi.