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Arterial thrombosis is the formation of a blood clot (thrombus) inside an artery. Arteries carry oxygen-rich blood away from the heart. This clot severely restricts or blocks blood flow, leading to tissue death (ischemia) in the downstream area, such as the heart, brain, or limbs.
read more about arterial thrombosis ...The mechanism of clot formation is usually related to damage to the inner wall of the artery. Atherosclerosis (plaque buildup) causes the artery wall to become rough, which triggers platelets to accumulate and form a clot (thrombus) at the site of the plaque rupture. This process leads to the most common causes of cardiovascular death, including heart attacks and strokes, requiring rapid intervention to prevent irreversible tissue damage.
The consequences depend entirely on the location of the blockage. A clot blocking an artery leading to the heart causes a heart attack, signaled by severe chest pain or arm pain. A clot blocking an artery leading to the brain causes a cerebral stroke, characterized by sudden confusion or weakness on one side of the body. All signs of arterial thrombosis, including acute pain, coldness, and numbness in a limb are life-threatening and signal an urgent need for medical care to restore perfusion.
Arterial thrombosis severely impacts eye health when a clot blocks the central retinal artery (retinal artery occlusion or "eye stroke"). This sudden blockage cuts off blood supply to the retina, causing immediate, painless, and severe vision loss, which is often permanent if not treated within 90 minutes.
Standard emergency treatments focus on restoring blood flow. This involves administering clot-busting medications (thrombolytics) or performing a mechanical procedure to physically remove the clot (thrombectomy) or widen the artery (angioplasty and stenting).
Major risk factors include high blood pressure, high cholesterol, diabetes, smoking, and a sedentary lifestyle. These factors all contribute to the accelerated buildup of atherosclerotic plaque within the arterial walls.
No, arterial thrombosis affects arteries and causes tissue death (infarction). Venous thrombosis affects veins and causes congestion.
Yes, clot-busting drugs (thrombolytics) can dissolve the clot, but they must be administered quickly (usually within hours).
The most common cause is the rupture of an atherosclerotic plaque in the artery wall.
Seek emergency care for sudden vision loss in one eye; this could be a "Central Retinal Artery Occlusion" (CRAO), an arterial thrombosis of the eye. It is often a warning sign of an impending stroke and requires immediate neurological and vascular evaluation.
AAO. Retinal Artery Occlusion (aao.org). 2024.
Mayo Clinic. Arterial Thrombosis (mayoclinic.org). 2024.
Cleveland Clinic. Thrombosis vs Embolism (clevelandclinic.org). 2023.
StatPearls. Arterial Embolism (ncbi.nlm.nih.gov). 2024.