Pulmonary hypertension

Original Article:  http://www.mayoclinic.com/health/medical/IM01068
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Pulmonary hypertension

Illustration showing blood flow in lungs and normal and blocked pulmonary arteries

When the tiny arteries in your lungs become narrow or blocked, or destroyed as in emphysema, there's increased resistance to blood flow through the lungs. This, in turn, causes increased pressure within these arteries, a condition known as pulmonary hypertension.
IM01068

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