Abstract: Objective The aim of this study was to explore the value of color Doppler ultrasonography in the diagnosis of biliary complications in patients after liver transplantation,and to provide a guarantee for improving the survival rate of transplanted liver.Methods The clinical data of 54 patients underwent liver transplantation were analyzed in our hospital between May 2014 and September 2018. Color Doppler ultrasonography and cholangiography were carried out in all the patients.Results 14 patients were found to have biliary complications in our series of patients after liver transplantation,with biliary stricture in 9 and biliary sldge sediment and gallstone formation in 5;the diameters of the intrahepatic bile ducts and the common bile ducts in patients with biliary complications were （4.7±2.1） mm and （7.5±3.6） mm,both significantly larger than （1.2±0.5） mm and （4.3±1.6） mm in those without（P<0.05）;the wall thickness of the inner bile ducts and the common bile ducts were （2.3±0.4） mm and （4.7±1.5） mm,both significantly larger than （0.8±0.2） mm and （2.1±0.9） mm in those without（P<0.05）;we set the total bile duct diameter>6 mm,having bile duct wall echo enhancement and total bile duct wall thickness>3.5 mm as the diagnostic criteria,the sensitivity of color Doppler ultrasonography for diagnosing biliary complications after liver transplantation was 57.1%,and the specificity was 80.0%. Conclusion The application of color Doppler ultrasonography for the diagnosis of biliary complications after liver transplantation is noninvasive,convenient and repetitive,which might help the clinicians to make a comprehensive judgment and evaluation.

Key words: Liver transplantation, Color Doppler ultrasonography, Biliary complications, Diagnosis