Treatment was interrupted in 3.6% of the patients. The results are significantly less good when the greater the number of stones or their maximal diameter increases. Actuarial analysis of the subgroups according to the stone mass (size and number) selected an ideal patient population with solitary stones less than 20 mm diameter (84% stone free after one year). In 601 patients with radiolucent stones complete clearance of all fragments was obtained after three, six, 12, and 18 months in respectively 20, 41, 64, and 78%. Concomitant chemolitholytic treatment (ursodeoxycholic and chenodeoxycholic acid 7.5 mg/kg/day each) was administered until three months after total fragment clearance for a maximum therapy period of 1.5 years. The procedure was carried out on an out-patient basis without analgesics or sedatives. During a period of 24 months 693 consecutive patients with symptomatic gall bladder stones (526 males, 167 females mean age 51 years, range 18-89) were treated by extracorporeal shock wave lithotripsy with a Piezolith 2300.
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