Carotid Artery Stenosis
Carotid artery stenosis is a narrowing of the carotid arteries in the neck, usually caused by plaque buildup. Because these arteries supply blood to the brain, significant narrowing can increase the risk of stroke and may require medical treatment or a procedure to restore blood flow.
Quick Answer
Carotid artery stenosis is a narrowing of the carotid arteries in the neck, usually caused by plaque buildup (atherosclerosis). Significant narrowing can increase the risk of stroke by reducing blood flow or allowing plaque or blood clots to travel to the brain. Because carotid stenosis often causes no symptoms until a TIA or stroke occurs, treatment focuses on reducing stroke risk through medical management and, when appropriate, carotid endarterectomy or carotid artery stenting.
Key Takeaways
- Carotid artery stenosis is usually caused by plaque buildup (atherosclerosis) in the arteries that supply blood to the brain.
- The condition often causes no symptoms until a transient ischemic attack (TIA) or stroke occurs.
- Stroke risk depends on factors including the severity of narrowing and whether neurological symptoms have occurred.
- Treatment may include medication and risk-factor management, carotid endarterectomy, or carotid artery stenting.
- The goal of treatment is to reduce the risk of a future stroke.
At a Glance
| What it is | Narrowing of the carotid arteries from plaque buildup |
|---|---|
| Why it matters | Can increase the risk of TIA or stroke |
| Common symptoms | Often none; may present with TIA or stroke symptoms |
| How it's diagnosed | Carotid ultrasound, CTA, MRA, or catheter angiography |
| Treatment options | Medical therapy, carotid endarterectomy, or carotid artery stenting |
Symptoms
Carotid stenosis often causes no symptoms and is discovered during evaluation for other conditions or when a physician hears an abnormal sound over the artery. When symptoms occur, they usually reflect a stroke or transient ischemic attack (TIA), including sudden weakness or numbness on one side, difficulty speaking, or temporary loss of vision in one eye.
A TIA, sometimes called a mini-stroke, produces stroke-like symptoms that resolve, often within minutes. It is a serious warning sign that a full stroke may follow and should be evaluated urgently, even after the symptoms disappear.
Common Warning Signs
- Often no symptoms until a warning event
- Temporary loss of vision in one eye
- Sudden one-sided weakness or numbness
- Sudden difficulty speaking
- An abnormal sound heard over the neck artery
When to Seek Care Promptly
- Any sudden stroke symptom: call emergency services now
- Temporary vision loss in one eye
- Stroke-like symptoms that resolve (possible TIA)
- Sudden weakness on one side
- Sudden difficulty speaking or understanding
Diagnosis
Carotid stenosis is often first detected with carotid ultrasound, a noninvasive test that measures the degree of narrowing and blood flow. CT angiography or MR angiography provides detailed images of the arteries and confirms the severity and anatomy.
The degree of narrowing, whether it has caused symptoms, and the plaque characteristics guide treatment. Symptomatic stenosis and higher degrees of narrowing carry greater stroke risk and are more likely to warrant a procedure.
Treatment
Treatment for carotid artery stenosis is individualized based on the severity of narrowing, whether a TIA or stroke has occurred, the anatomy of the artery and plaque, and the patient’s overall health. The goal is to reduce the risk of future stroke while balancing the risks and benefits of treatment.
Medical Management
For many patients, treatment focuses on reducing stroke risk through medication and management of factors such as high blood pressure, high cholesterol, diabetes, and smoking. Medical management may be used alone or alongside a procedure when appropriate.
Carotid Endarterectomy
Carotid endarterectomy removes plaque directly from inside the carotid artery to restore blood flow. It may be recommended for selected patients with significant narrowing, particularly when carotid stenosis has caused a TIA or stroke.
Carotid Artery Stenting
Carotid artery stenting treats the narrowing from inside the blood vessel using a catheter and stent to help keep the artery open. It may provide an alternative to open surgery for selected patients based on their anatomy, medical history, and procedural risk.
Choosing the Right Approach
The best treatment depends on the degree of narrowing, whether symptoms have occurred, the anatomy of the carotid artery and plaque, age, overall health, and the relative risks of each treatment option.
Why treatment planning matters: These factors help determine whether medical management, carotid endarterectomy, or carotid artery stenting offers the appropriate balance of stroke prevention and treatment risk.
Frequently Asked Questions
Carotid artery stenosis is a narrowing of one or both carotid arteries in the neck, usually caused by plaque buildup (atherosclerosis). Because these arteries supply blood to the brain, significant narrowing can increase the risk of TIA or stroke.
Yes. Carotid stenosis can increase stroke risk if plaque or a blood clot travels to the brain or if severe narrowing reduces blood flow. The degree of narrowing and whether neurological symptoms have occurred are important factors when assessing risk.
No. Many people have no symptoms and the condition is discovered during imaging performed for another reason. In other cases, the first sign may be a transient ischemic attack (TIA) or stroke.
Carotid ultrasound is commonly used to evaluate blood flow and estimate the degree of narrowing. CTA or MRA can provide more detailed images of the arteries, and catheter angiography may be used when additional detail is needed for treatment planning.
No. Treatment depends on the severity of narrowing, whether symptoms have occurred, anatomy, overall health, and other stroke risk factors. Some patients are treated with medication and risk-factor management, while others may benefit from a procedure.
Carotid endarterectomy is an open surgical procedure that removes plaque directly from inside the carotid artery to restore blood flow. It may be recommended for selected patients with significant carotid narrowing.
Carotid artery stenting is an endovascular procedure performed from inside the blood vessel. A catheter is used to reach the narrowed carotid artery, where a stent is placed to help keep the artery open.
The appropriate approach depends on factors including the degree of narrowing, whether a TIA or stroke has occurred, the anatomy of the artery and plaque, age, overall health, and the risks associated with each procedure. Treatment is individualized for each patient.
The Diagnosis-to-Treatment Pathway
1. Detection
Carotid stenosis may be found during evaluation for a TIA or stroke or incidentally on vascular imaging.
2. Vascular imaging
Carotid ultrasound, CTA, MRA, or catheter angiography defines the location and severity of narrowing.
3. Stroke-risk assessment
Symptoms, degree of stenosis, plaque characteristics, age, anatomy, and overall health are evaluated.
4. Medical management
Medication and risk-factor reduction are used when appropriate to lower stroke risk.
5. Procedure when indicated
Carotid endarterectomy or carotid artery stenting may be recommended for selected patients with significant narrowing.
6. Follow-up
Ongoing imaging and medical management help monitor the artery and reduce future stroke risk.
Specialists Who Treat Carotid Stenosis
Your care is provided by Atlantic Brain and Spine's neurovascular team, including fellowship-trained cerebrovascular and endovascular neurosurgeons.
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