title: Haemodynamic changes in the liver under balloon occlusion of a portal vein branch: evaluation with single-level dynamic computed tomography during hepatic arteriography.
abstract: OBJECTIVE
  To assess haemodynamic changes in the liver under temporary occlusion of an intrahepatic portal vein.
  
  
  METHODS
  Between February 2000 and October 2004, 16 patients with hepatobiliary disease underwent single-level dynamic computed tomography during hepatic arteriography (SLD-CTHA) under temporary balloon occlusion of an intrahepatic portal vein. All patients needed percutaneous transhepatic portography for therapy of their disease. SLD-CTHA was undertaken to clarify the time-attenuation curve influenced by portal vein occlusion, and it was performed continuously over a period of 30s. The difference in absolute attenuation of the liver parenchyma in segments with occluded and non-occluded portal vein branches was determined by means of the CT number, and the difference in absolute attenuation of the occluded and non-occluded portal veins themselves was also evaluated.
  
  
  RESULTS
  SLD-CTHA demonstrated a demarcated hyperattenuation area in the corresponding distribution of the occluded portal vein branch. The attenuation of the liver parenchyma supplied by the occluded portal vein was significantly higher than that in the non-occluded area (p<0.01). The balloon-occluded portal branch enhancement in 15 of 16 cases (94%) appears due to arterio-portal communications. Failure to evaluate a remaining case for portal branch enhancement was due to absence of a visualized portal branch in the section.
  
  
  CONCLUSIONS
  Under temporary occlusion of an intrahepatic portal vein, hepatic angiography produced enhancement of the occluded portal branches and their corresponding parenchymal distribution; this finding is considered consistent with the presence of arterio-portal communications.
authors.affiliation: Department of Radiology, Center for Advanced Medical Technology, Sendagi, Tokyo, Japan. brian-komada@msj.biglobe.ne.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Komada
authors.forename: S
authors.initials: S
authors.lastname: Murata
authors.forename: H
authors.initials: H
authors.lastname: Tajima
authors.forename: S
authors.initials: S
authors.lastname: Kumita
authors.forename: H
authors.initials: H
authors.lastname: Kanazawa
authors.forename: T
authors.initials: T
authors.lastname: Tajiri
mesh_terms: D000328:Adult; D000368:Aged; D021721:Balloon Occlusion / Q000379:methods*; D005260:Female; D006499:Hepatic Artery / Q000000981:diagnostic imaging; D006801:Humans; D008099:Liver / Q000000981:diagnostic imaging / Q000503:physiopathology*; D008102:Liver Circulation / Q000502:physiology*; D008103:Liver Cirrhosis / Q000000981:diagnostic imaging / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014057:Tomography, X-Ray Computed / Q000379:methods; D014463:Ultrasonography