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Three primary factors contribute to the formation of pulmonary embolism (also known as Virchow's Triad):
1. Endothelial Damage: Any injury to the endothelial lining that covers the inner surface of blood vessels.
2. Venous Stasis: A slowdown of blood flow or stagnation of blood within the vessels.
3. Hypercoagulability: An increased tendency of the blood to clot.
As a result of the combination of these three factors, a blood clot (thrombus) typically forms in the deep veins of the lower extremities (legs and feet), and less commonly in veins in the abdominal region. This formed clot travels through the bloodstream to the heart's right ventricle and is then carried to the lungs via the pulmonary arteries. Upon reaching the lungs, the clot, depending on its size, obstructs one or more pulmonary vessels, thereby impeding blood flow to the affected part of the lung. The size and number of obstructed vessels directly influence the severity and clinical presentation of pulmonary embolism; the larger and more numerous the blocked vessels, the more severe the potential consequences.
How Does Pulmonary Embolism Occur?
1. Endothelial Damage: Any injury to the endothelial lining that covers the inner surface of blood vessels.
2. Venous Stasis: A slowdown of blood flow or stagnation of blood within the vessels.
3. Hypercoagulability: An increased tendency of the blood to clot.
As a result of the combination of these three factors, a blood clot (thrombus) typically forms in the deep veins of the lower extremities (legs and feet), and less commonly in veins in the abdominal region. This formed clot travels through the bloodstream to the heart's right ventricle and is then carried to the lungs via the pulmonary arteries. Upon reaching the lungs, the clot, depending on its size, obstructs one or more pulmonary vessels, thereby impeding blood flow to the affected part of the lung. The size and number of obstructed vessels directly influence the severity and clinical presentation of pulmonary embolism; the larger and more numerous the blocked vessels, the more severe the potential consequences.