In situ echoguided extracorporeal shock wave lithotripsy of ureteric stones with the Dornier MPL 9000: a multicentric study group.

Objective: To study the efficacy of the Dornier MPL 9000 lithotripter with a real time ultrasound transducer in the localization and treatment of upper and prevesical ureteric stones.

Patients And Methods: Two-hundred and eighty-five patients with pre-vesical ureteric stones and 247 patients with upper ureteric stones underwent extracorporeal shock wave lithotripsy (ESWL) using ultrasound targeting, under no regional or general anaesthesia.

Results: At follow-up after 3 months 97% of patients with pre-vesical stones and 96% with upper ureteric stones were stone free. Ninety-nine patients were treated more than once. The average number of sessions of ESWL for all patients was 1.19 (1.17 for patients with prevesical stones and 1.22 for those with upper ureteric stones). Ureteric stenting was employed in 6% of cases. The infrequent use of ureteric stenting did not reduce ESWL efficacy, nor increase either the complication or the retreatment rates. In many cases upper urinary tract dilatation was provoked by administering intravenous fluid and a diuretic.

Conclusion: In situ echoguided ESWL is a simple, safe and effective technique for treating ureteric stones which can be detected on ultrasound.