Abstract
Pulmonary embolism is a sudden occlusion of blood flow to the lungs by a blood clot that has usually arisen from a deep vein thrombosis. Clots can break off and then travel through the heart to the lungs. Large clots lodge in the main pulmonary artery, causing a potentially fatal blockage. Smaller clots travel to the lung periphery where they may cause inflammation that results in pleuritic chest pain.
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