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From there, blood makes its way to the Vena cava, the largest vein in the body to return to the heart. Portal hypertension describes elevated pressure within the portal system, including the portal vein and the tributary veins that drain into it.
abnormally increased pressure in the portal circulation caused by impedance of blood flow through a diseased liver or portal vein. pulmonary hypertension. results from high-pressure blood flow from the right ventricle or impedance to blood flow through the lungs or through the left heart.