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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.
Pulmonary arterial hypertension (PAH) is a rare form of high blood pressure. It occurs in the pulmonary arteries that flow from your heart and through your lungs.Constricted and narrowed arteries prevent your heart from pumping adequate blood.When constriction occurs, the heart will need to work harder to compensate.ulmonary arterial hypertension (PAH) is a rare form of high blood pressure. It occurs in the pulmonary arteries that flow from your heart and through your lungs.