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Pulmonary embolism typically arises from the interaction of three primary factors, often referred to as Virchow's triad:
1. Endothelial Injury: Damage to the endothelium, the inner lining of blood vessels.
2. Venous Stasis: Stagnation or slowdown of blood flow within the veins.
3. Hypercoagulability: An increased tendency of the blood to clot.
These conditions often lead to the formation of a blood clot (thrombus), most commonly in the deep veins of the lower extremities (legs and feet) or less frequently in the pelvic/abdominal region. This thrombus can detach and travel through the bloodstream, reaching the heart's right ventricle. From there, it is pumped into the pulmonary arteries, ultimately lodging in the lungs and causing a pulmonary embolism.
Upon reaching the lungs, the clot obstructs one or more pulmonary arteries, impairing blood flow to the affected lung tissue. The severity of the pulmonary embolism is directly related to the size of the clot and the number and caliber of the obstructed vessels.
How Does Pulmonary Embolism Occur?
1. Endothelial Injury: Damage to the endothelium, the inner lining of blood vessels.
2. Venous Stasis: Stagnation or slowdown of blood flow within the veins.
3. Hypercoagulability: An increased tendency of the blood to clot.
These conditions often lead to the formation of a blood clot (thrombus), most commonly in the deep veins of the lower extremities (legs and feet) or less frequently in the pelvic/abdominal region. This thrombus can detach and travel through the bloodstream, reaching the heart's right ventricle. From there, it is pumped into the pulmonary arteries, ultimately lodging in the lungs and causing a pulmonary embolism.
Upon reaching the lungs, the clot obstructs one or more pulmonary arteries, impairing blood flow to the affected lung tissue. The severity of the pulmonary embolism is directly related to the size of the clot and the number and caliber of the obstructed vessels.