[Combination therapy of gallbladder stones using extracorporeal shock waves and bile acids: results in relation to stone diameter and stone number].

420 patients were referred to our center for gallstone lithotripsy. 97 patients (23%) with radiolucent gallbladder stones (total diameter less than or equal to 3 cm) and intact gallbladder function were found suitable for extracorporal shock-wave lithotripsy. Disintegration of gallbladder stones was achieved in 92 of the 97 patients (95%). Chenodeoxycholic acid and ursodeoxycholic acid were used as adjuvant litholytic therapy. The therapeutic results were evaluated cumulatively in 90 patients after a follow-up of 10 months. 80% of patients with solitary stones (less than or equal to 20 mm in diameter (n = 46) had a stone-free gallbladder, whereas patients with solitary stones greater than 2 cm, less than or equal to 3 cm in diameter (n = 20) and multiple stones (n = 22) became stone-free in only 28% (p less than 0.01). During the observation period 21 patients (23%) experienced biliary colics, 2 (2%) mild pancreatitis, 2 (2%) showed fragment impaction in the common bile duct, and 17 (19%) displayed transient microscopic hematuria. Our results confirm previous studies showing that solitary stones sized up to 2 cm in diameter represent the best suited subgroup for extracorporeal shock-wave lithotripsy.