What Is Pulmonary Hypertension?

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Primary, or unexplained, pulmonary hypertension (PPH) is a rare lung disorder in which the blood pressure in the pulmonary arteries rises far above normal levels for no apparent reason, resulting in increased work for the heart. It occurs in the absence of other disease in the heart or lungs.

The pulmonary artery is the blood vessel carrying oxygen-poor blood from the right ventricle (one of the pumping chambers of the heart) to the lungs. In the lungs, the blood picks up oxygen and then flows...

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