Stenting for choledocholithiasis: temporizing or therapeutic?

Maxton and colleagues report their experience using biliary endoprostheses for treatment of failed common bile duct stone clearance after sphincterotomy. Of 283 patients with choledocholithiasis referred to their tertiary facility, 85 failed to have their ducts cleared with the first ERCP. There were 21 male and 64 female subjects; mean age was 77.5 yr. Clinical presentations were jaundice (39), cholangitis (23), and biliary colic and/or abnormal liver blood tests in the remainder. The patients were characterized as "elderly and ill with either jaundice or cholangitis present in almost 75%." Follow-up data were obtained for all patients. ERCP was first performed using a duodenoscope with a 3.2-mm instrument channel. A 7-French double pigtail stent was placed in each of the 85 patients with retained stones. Subsequent ERCP were performed at 2- to 3-month intervals using a therapeutic duodenoscope (4.2-mm instrument channel). A second stent was placed if stones remained in the bile duct after repeated extraction attempts. Patients deemed too frail and elderly for frequent ERCP had their first stent left in place, with stent exchanges and attempts at stone extraction every 6-12 months. Mechanical lithotripsy was used in 23 patients, extracorporeal shock wave lithotripsy (ESWL) in 11, and dissolution therapy via nasobiliary catheter in 10. Acute illnesses resolved in 84 of 85 patients, with significant decreases in bilirubin and alkaline phosphatase levels by the second ERCP. Six patients died with temporary stents in situ, one form a respiratory arrest the day of ERCP; the other deaths were unrelated to ERCP or choledocholithiasis. Fifty of the remaining 79 patients had successful stone clearance; 68% of these required two ERCP, 20% three ERCP, 6% four ERCP, and, in another 6%, a total of five ERCP were required before their ducts were free of stones. Seven cases of cholangitis among these 50 patients were treated successfully with i.v. antibiotics, fluids, and "early" stent replacement. Twenty-six patients had long term biliary drainage with the original stents in situ over 12 months. Four of these patients were among the six deaths, all unrelated to biliary stones or ERCP. Three patients were referred for surgical stone removal. The authors conclude that placement of a single 7-French stent after failure to clear common duct stones is safe, provides affective biliary drainage, can prevent the need for urgent surgical intervention, and allows for transfer of sick patients to centers of expertise. Further attempts at bile duct clearance were successful in most cases.