The normal pulmonary vasculature is a low-pressure system compared with the systemic vasculature. Pulmonary hypertension is characterized by a mean pulmonary artery pressure higher than 25 mmHg. The primary pathophysiological process of pulmonary hypertension is a restriction of blood flow through the pulmonary circulation, which leads to increased pulmonary vascular resistance and eventual failure of the right ventricle. Pulmonary hypertension may be idiopathic (PAH) or aconsequence of chronic diseases, including left-sided heart failure, parenchymal lung diseases, and thromboembolic disease. Pathological […]