Pulmonary Embolism


A pulmonary embolism is a blockage of an artery in the lungs. The embolism prevents blood and nourishment from getting to a specific area of the lungs. This may lead to the death of lung tissue in this area. Damage to the lungs may make it difficult for the lungs to work properly. In severe cases, a pulmonary embolism can lead to death.
Pathway of Pulmonary Embolism
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An embolism is caused by a lump of material, called an embolus, that is floating in the blood. The embolus is usually a blood clot, but can also be an air bubble, a piece of fat, bone marrow, or tumor tissue. The embolus travels from its original location and passes through larger blood vessels until it gets stuck in a smaller blood vessel. In this case, the embolus is trapped in an artery of the lungs.A pulmonary embolism from a blood clot most often starts in a vein in the legs or pelvis.

Risk Factors

Factors that may increase your chance of a pulmonary embolism include:

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