Comparison of diagnostic efficacy between intracavity contrast-enhanced ultrasound and conventional ultrasound for drainage tube obstruction after percutaneous transhepatic cholangial drainage

Jiao Peng; Yu Ming; Qin Haocheng; Song Jian; Li Haodong

doi:10.26939/j.cnki.CN11-9353/R.2025.05.003

Abstract：Objective To compare and analyze the diagnostic efficacy of intracavity contrast-enhanced ultrasound(IC-CEUS)versus conventional ultrasound(C-US)in detecting drain tube blockage after percutaneous transhepatic cholangial drainage(PTCD).Methods A total of 66 patients suspected of drain tube blockage following percutaneous transhepatic cholangial drainage at our hospital from January 2024 to March 2025 were enrolled as the study subjects.All patients underwent both intracavity contrast-enhanced ultrasound and conventional ultrasound examinations.Using reintervention(guidewire recanalization or repeat PTCD)as the gold standard,the diagnostic effects of the two modalities for detecting drain tube blockage after percutaneous transhepatic cholangial drainage were compared.Results The detection rate of drain tube blockage by intracavity contrast-enhanced ultrasound was significantly higher than that by conventional ultrasound(positive predictive value:97.78%vs.84.21%,χ2=5.114,P=0.047;negative predictive value:85.71%vs.46.43%,χ2=7.224,P=0.007).The sensitivity,specificity and accuracy of intracavity contrast-enhanced ultrasound were 93.62%,94.74%and 93.94%,respectively.In contrast,the sensitivity,specificity and accuracy of conventional ultrasound were 68.09%,68.42%and 68.18%,respectively.The sensitivity,specificity and accuracy of intracavity contrast-enhanced ultrasound were all significantly superior to those of conventional ultrasound(P<0.05).Conclusion Intracavity contrast-enhanced ultrasound can accurately visualize the location of drain tube blockage,demonstrating significantly better performance than conventional ultrasound.It exhibits outstanding diagnostic efficacy and holds important clinical significance for assessing the drain tube patency in patients after percutaneous transhepatic cholangial drainage.