Intraductal thermal injury using a heat probe and radiofrequency ablation electrode in a swine model of biliary stenosis

摘要

Background and objective: An animal model for bile duct stenosis using intraductal thermal injury has not yet been established. The aims of the current study were to develop biliary stenosis in a swine model by inducing intraductal thermal injury using a heat probe or radiofrequency ablation electrode and to investigate an effective and safe energy dose. Methods: Intraluminal thermal injury was applied to the common bile duct with a heat probe in three swines and a radiofrequency ablation electrode in the other three swines by either endoscopic retrograde cholangiography or open laparotomy. Cholangiography and histologic evaluation of common bile duct were taken 2 weeks after thermal injury. Results: Thermal injury with a heat probe at 25. J for 40. seconds produced a stricture in all three animals. Application of a radiofrequency ablation electrode produced a stricture in two of three animals. An energy dose of 40. W at 80. °C for 30. seconds produced biliary stenosis without any complications initially and 2 weeks after thermal injury. Conclusions: The application of a heat probe and a radiofrequency ablation electrode for intraductal thermal injury resulted in a reproducible animal model of biliary stenosis.