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Carotid artery disease is a serious vascular condition where the two large carotid arteries in the neck, which are the main vessels responsible for supplying oxygenated blood to the brain and head, become narrowed or blocked. This condition is caused by the accumulation of plaque and severely restricts the necessary blood flow to cerebral and ocular tissues.
read more about carotid artery disease ...The primary cause is atherosclerosis (often called hardening of the arteries), where fatty deposits, cholesterol, and calcium accumulate inside the artery walls to form plaque. This plaque buildup narrows the internal diameter of the artery (stenosis), impeding blood flow.
More dangerously, the rough, ulcerated surface of the plaque can trigger the formation of blood clots. These clots can break off (embolize) and travel to the smaller arteries in the brain or eye, causing an ischemic stroke or a mini-stroke (TIA).
Symptoms associated with carotid artery disease signal an acute, transient, or permanent reduction of blood flow to the brain or eye. These include sudden, often painless, vision loss in one eye, known as amaurosis fugax (or "a curtain coming down").
Other crucial signs include sudden weakness or numbness on one side of the face or body, difficulty speaking, slurred speech, confusion, or difficulty coordinating limbs. Even temporary symptoms (a Transient Ischaemic Attack or TIA) require immediate emergency care, as they are a critical warning sign of an impending major stroke.
Carotid Artery Disease severely impacts vision because the ophthalmic artery, which supplies the eye, is a direct branch of the internal carotid artery. Plaque or clots traveling from the narrowed neck artery can lodge in and block the central retinal artery (Central Retinal Artery Occlusion, or CRAO), causing immediate, painless, and often permanent total loss of vision in that eye (a "stroke of the eye"). Chronic low flow can also lead to ocular ischemic syndrome, causing chronic pain and visual changes.
Diagnosis involves a specialized, non-invasive ultrasound of the neck, known as a carotid duplex scan, which measures the blood flow velocity and visualizes the degree of plaque buildup (stenosis) in the arteries. Magnetic Resonance Angiography (MRA) or Computed Tomography Angiography (CTA) may also be used to precisely assess the severity and extent of the blockage and plan treatment.
The necessary treatment focuses aggressively on stroke prevention. Treatment involves medical management with medications (including statins to lower cholesterol and anti-platelet drugs like aspirin to prevent clot formation). For severe blockages (typically over 70%), surgical procedures are performed, such as carotid endarterectomy (to surgically remove the plaque) or carotid artery stenting (to place a mesh tube to widen the artery).
No, narrowing of the arteries typically causes no pain in the neck; symptoms only appear when brain blood flow is blocked.
No, plaque buildup is permanent, but medical treatment and lifestyle changes can slow progression and prevent stroke.
No, a TIA is a mini-stroke (temporary blockage), but it is a critical warning sign that a permanent stroke is likely soon.
If you experience "Hollenhorst Plaques", tiny orange-yellow crystals seen in your retina during an eye exam, you have Carotid Artery Disease. These plaques are bits of cholesterol that have broken off from your neck artery. This is a medical emergency requiring a carotid ultrasound.
Mayo Clinic. Carotid Artery Disease (mayoclinic.org). 2024.
AAO. Hollenhorst Plaque and Stroke (aao.org). 2024.
Cleveland Clinic. Carotid Disease Guide (clevelandclinic.org). 2024.
StatPearls. Carotid Artery Stenosis (ncbi.nlm.nih.gov). 2024.