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How does atherosclerosis contribute to thrombosis?
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bleeding and blood clotting
Red blood cells (erythrocytes) trapped in a mesh of fibrin threads. Fibrin, a tough, insoluble protein formed after injury to the blood vessels, is an essential component of blood clots.
Atherosclerosis contributes to thrombosis primarily through the disruption of the arterial endothelium and the instability of atherosclerotic plaques.12
The process occurs through the following mechanisms:
- Endothelial Disturbance: The presence of plaques can cause injury or disturbances to the endothelial lining of the artery. When the endothelium is damaged, it can trigger the coagulation cascade, leading to the formation of a thrombus at the site of the plaque.23
- Plaque Disruption: Atherosclerotic plaques are susceptible to disruptive influences. If a plaque surface is compromised, it promotes the rapid formation of a blood clot. This acute thrombotic event can cause sudden vessel occlusion, preventing the body from compensating for the loss of blood flow.1
- Embolization: In some cases, such as with aneurysms caused by arterial wall destruction, blood clots may form and subsequently break off, traveling downstream to occlude smaller vessels.12
These acute thrombotic occlusions are responsible for severe clinical complications, including myocardial infarction and stroke, by causing irreversible tissue damage due to sudden ischemia.12