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  • Attempted induction of chronic portal venous hypertension with polyvinyl alcohol particles in swine
    Pavčnik, Dušan, 1948-2019 ...
    PURPOSE: Creation of presinusoidal chronic portal venous hypertension by meansof repeated portal vein (PV) embolization was explored in an attempt to improve a porcine model of transjugular ... intrahepatic portosystemic shunt (TIPS) patency. MATERIALS AND METHODS: Six microswine underwent weekly PV embolization for 5 weeks with a total of 10.4-12.6 g of polyvinyl alcohol (PVA) particles (0.149-0.250 mm in size). Portography, liver function tests, pressure measurement in the PV and inferior vena cava (IVC) before and after PV embolization, and histopathologic evaluation of the livers were performed. RESULTS: Transhepatic portal venography performed after each embolization demonstrated diffuse PV branch occlusion in all cases. At weekly follow-up, reconstitution of flow was demonstrated in these branches; permanent occlusionof PV branches was not achieved. The mean PV pressure elevated acutely from 17.3 mm Hg +/- 0.9 to 24.5 mm Hg +/- 4.2 (P less th. .01) after each embolization. However, the pressure always returned to baseline on the follow-up studies 1 week later. Liver function tests were normal. Histopathologic evaluation of the liver showed, in multiple PV branches, central plugs of PVA with peripheral recanalization. The liver parenchyma was otherwise normal. CONCLUSION: Massive embolizations of PV with PVA at weekly intervals failed to create permanent portal hypertension or induce hepatic fibrosis.
    Vir: Journal of vascular and interventional radiology [Elektronski vir]. - ISSN 1051-0443 (Pt. 1, Let. 8, št. 1, 1997, str. 123-128)
    Vrsta gradiva - članek, sestavni del
    Leto - 1997
    Jezik - angleški
    COBISS.SI-ID - 7151577

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