![]() Group 1: Pulmonary arterial hypertension (PAH) Pulmonary hypertension is classified into five groups, depending on the cause. These changes may slow down or stop blood flow through the lungs, causing pulmonary hypertension. These blood vessels are the pulmonary arteries, capillaries and veins.īut changes in the cells that line the lung arteries can cause the artery walls to become narrow, stiff, swollen and thick. ![]() The blood passes through a large blood vessel called the pulmonary artery.īlood usually flows easily through blood vessels in the lungs to the left side of the heart. Each time blood moves through the heart, the lower right chamber pumps blood to the lungs. The typical heart has two upper chambers and two lower chambers. The heart valves, which keep blood flowing in the right direction, are gates at the chamber openings. The lower chambers, the more muscular right and left ventricles, pump blood out of the heart. The upper chambers, the right and left atria, receive incoming blood. ![]() A typical heart has two upper and two lower chambers.
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