Experimental observation in vivo on the complications caused by radiofrequency ablation via the lumen of bile duct in Hilum hepatis / 中国现代普通外科进展

ABSTRACT

Objective:To observe the complications caused by radiofrequency ablation (RFA) after RFA via the lumen of bile duct in hilum hepatis and the pathological progress of the tissue in ablation zones. Methods: Fourteen healthy dogs were randomly divided into 2 groups with 7 dogs each group. RFA by inserting a 13 mm non-insulated mono-electrode into the lumen of bile duct was performed under general anesthesia on 10 W power output, 4 min ablation duration in group Ⅰand on 5 W power output, 8 min ablation duration in group Ⅱ. After RFA, 2 dogs were sacrificed in 3 days and 1 dog in 9 days and 4 dogs in 14 days respectively in each group. The complications concerning RFA such as bile leakage, cholelithiasis, hepatic artery thrombosis, portal vein thrombosis, hepatic vein thrombosis1 and vena cava thrombosis were observed. Results: Portal vein thrombosis, hepatic vein thrombosis and vena cava thrombosis occurred in one dog. Cholelithisis occurred in one dos. No hepatic artery thrombosis occurred in all dogs. No bile leakage caused by RFA occurred in all dogs. Obvious necrosis of the mucosal and submucosal layers of the wall of bile duct and hepatic tissue in coagulation zones occurred in 3 days after RFA. The infiltration of inflammatory cells and partial fibrosis of the mucosal and submucosal layers of bile duct and hepatic tissue occurred in 9 days after RFA. Obvious fibrosis of the wall of bile duct and hepatic tissue occurred in 14 days after RFA. Conclusions: The complications caused by RFA occur seldom after RFA via the lumen of bile duct. The necrosis, the infiltration of inflammatory cells and gradual fibrosis of the mucosal and submucosal layers of bile duct and hepatic tissue occur in ablation zone.