Pulmonary hypertension (PH) is a rare disease relating to the lungs that causes a dangerous increase in blood pressure in the pulmonary arteries, which are responsible for distributing deoxygenated blood from the heart to the lungs. It is a serious, chronic disease that leads to poor quality of life and possibly death when not properly treated, as the condition can eventually cause right heart failure. A  PH diagnosis is based on when blood pressure in the lungs is greater than 25 mm of mercury (Hg) at, or 30 mm Hg when a person exercises.  Comparitively, normal pulmonary artery pressure runs between 8 and 20 mm Hg at rest.

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