What Causes Primary Pulmonary Hypertension?

Certain types of congenital heart disease can, if left unrepaired, lead to high pressure in the lungs. Primary lung problems such as cystic fibrosis or bronchopulmonary dysplasia (BPD) can lead to elevated resistance in the lungs. A significant association exists between the use of the fen phen diet drug and PPH. Fen phen was taken off the market in the US in 1997. Studies have shown that it can be several years after having stopped taking diet drugs that patients develop the disease. ...

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