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Pulmonary embolism (blood clot in the lungs)

A blood clot in a pulmonary artery (the circulation of the lung.) Blood clots typically start in a vein in the leg. A clot builds up stuck to the wall of the vein, and some or all of the clot can break off, pass through the heart, and then float into a pulmonary artery. These arteries get progressively smaller and the clot (embolus) eventually lodges into one of these arteries preventing blood flow. These clots make circulation through the lungs inefficient so the lungs do not work as well. When the clot is very large (called a saddle embolus) it can result in rapid death. The following increase the risk of blood clots: recent surgery, previous blood clots, cancer, being bedbound, sitting for prolonged periods of time, birth control pills, surgery and pregnancy.
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