Treatment of non-extractable common bile duct stones with combination ursodeoxycholic acid plus endoprostheses.

Despite widely available technology for removal of bile duct stones, endoscopists currently encounter approximately 3% of patients with stones that defy extraction. After sphincterotomy and unsuccessful attempts at extraction of "defiant" stones, biliary stents were placed in 22 patients. Ten patients were treated with ursodeoxycholic acid, and 12 patients treated only with stent served as control subjects. Ductal strictures preventing stone extraction were present in eight control patients and in six patients treated with ursodeoxycholic acid. The number of total calculi in the ursodeoxycholic acid group was slightly higher (4.2 per patient) than the number in the control group (3.3 per patient). Stone and bile duct dimensions were similar in each group. Nine of 10 patients in the ursodeoxycholic acid group had complete stone clearance, and 41 of 42 stones were removed during a follow-up period of 9 +/- 2 months; in contrast, no patient in the control group had complete clearance and only 6 of 40 stones were removed after a follow-up period of 31 +/- 6 months. Oral ursodeoxycholic acid facilitates extraction of defiant bile duct stones. This treatment is an effective alternative to high-tech extraction methods for large biliary stones.