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About Pulmonary Hypertension. High blood pressure in the lungs is called pulmonary hypertension (PH) or pulmonary arterial hypertension (PAH). PAH is a chronic and life-changing disease that can lead to right heart failure if left untreated. Read about other types of PH. In this short video, Dr. Vallerie McLaughlin explains the basics of pulmonary arterial hypertension (PAH). To learn more about PH and PAH, explore this section or read a PAH Education Fact Sheet developed by the American Thoracic Society (ATS) for their Patient Information Series.
While the cause of primary pulmonary hypertension is uncertain, researchers think that in most people who develop the disease, the blood vessels are sensitive to certain factors that cause them to narrow.ulmonary hypertension is present when the blood pressure in the circulation of the lungs is measured at greater than 25 mm of mercury (Hg) at rest or 30 mm Hg during exercise. Pulmonary hypertension can be either primary or secondary: 1  Primary pulmonary hypertension. 2  The cause of pulmonary hypertension is unknown.