Use of radiologic examination of ducts during gallbladder surgery not linked with reduced risk of common duct injury

Published on August 28, 2013 at 1:18 AM · No Comments

In an analysis of a procedure used to help prevent common duct injury during gallbladder removal surgery, use of intraoperative cholangiography (radiologic examination of the ducts during gallbladder surgery) was not associated with a reduced risk of common duct injury, according to a study in the August 28 issue of JAMA.

"Biliary anatomy misidentification during cholecystectomy [gallbladder removal] can result in injury to the common hepatic duct or common bile duct. Common duct injuries cause significant short- and long-term morbidity including major operations, multiple hospitalizations, and biliary strictures. Elimination of common duct injury is desirable, but it has remained stubbornly present with rates ranging from 0.3 percent to 0.5 percent," according to background information in the article. "When routinely used, intra-operative cholangiography is thought to prevent common duct injury. However, controversy exists regarding the effectiveness of routine use in the prevention of common duct injury."

Kristin M. Sheffield, Ph.D., and Taylor S. Riall, M.D., Ph.D., of the University of Texas Medical Branch, Galveston, and colleagues investigated the association between intraoperative cholangiography use during cholecystectomy and common duct injury, using instrumental variable analysis, an effective way to overcome unmeasured confounding (i.e., factors influencing outcomes not found in the database). The researchers identified Medicare beneficiaries from Texas Medicare claims data who underwent inpatient or outpatient cholecystectomy for conditions including biliary colic or biliary dyskinesia, acute cholecystitis, or chronic cholecystitis. Percentage of intraoperative cholangiography use at the hospital and by surgeon were the instrumental variables. Patients with claims for common duct repair operations within 1 year of cholecystectomy were considered as having major common duct injury.

A total of 92,932 Medicare beneficiaries 66 years or older underwent cholecystectomy at 307 hospitals in Texas from 2001 through 2009. There were 37,533 cholecystectomies with intraoperative cholangiography (40.4 percent) and 55,399 without (59.6 percent). Common duct injury occurred in 280 patients (0.30 percent). There were 201 common duct injuries (0.36 percent) in patients undergoing cholecystectomy without intraoperative cholangiography and 79 injuries (0.21 percent) for those having an intraoperative cholangiography.

"In a logistic regression model controlling for patient, surgeon, and hospital characteristics, the odds of common duct injury for cholecystectomies performed without intraoperative cholangiography were increased compared with those performed with it. When confounding was controlled with instrumental variable analysis, the association between cholecystectomy performed without intraoperative cholangiography and duct injury was no longer significant," the authors write.

"Significant controversy exists regarding the role of intraoperative cholangiography in the prevention of common duct injury during cholecystectomy. Previous population-based studies using data from Medicare claims, hospital discharge records, and national inpatient registries report nearly 2-fold higher rates of injury in cholecystectomies performed without intraoperative cholangiography. In the present study using Texas Medicare claims data, the association between intraoperative cholangiography and common duct injury was highly sensitive to the analytic method used."

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