Carotid artery disease

What is Carotid artery disease?

Carotid artery disease happens when the major blood vessels in your neck become narrow or blocked. These arteries, called carotid arteries, carry oxygen-rich blood from your heart to your brain. When fatty deposits called plaque build up along the artery walls, blood flow to your brain decreases.

This buildup process is called atherosclerosis. It happens slowly over many years. Plaque is made of cholesterol, fat, calcium, and other substances in your blood. As plaque grows, it can harden and narrow the artery opening.

Carotid artery disease is a major cause of stroke in the United States. When plaque ruptures or breaks apart, blood clots can form and block blood flow to your brain. Even without a rupture, severely narrowed arteries can prevent enough blood from reaching brain tissue. This lack of blood flow can lead to a stroke or mini-stroke called a transient ischemic attack.

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Symptoms

Sudden numbness or weakness in your face, arm, or leg, especially on one side of your body
Sudden confusion or trouble speaking or understanding speech
Sudden trouble seeing in one or both eyes
Sudden dizziness, loss of balance, or trouble walking
Sudden severe headache with no known cause
Brief episodes of vision loss in one eye, lasting a few minutes
Difficulty swallowing or slurred speech that comes and goes

Most people with carotid artery disease have no symptoms until a stroke or mini-stroke occurs. The disease develops silently over decades. Regular screening is important if you have risk factors, even when you feel perfectly healthy.

Causes and risk factors

Carotid artery disease develops when cholesterol and other substances accumulate in your artery walls. High levels of LDL cholesterol in your blood contribute to plaque formation. Smoking damages artery walls and speeds up plaque buildup. High blood pressure puts extra force on artery walls, making them more vulnerable to damage. Diabetes affects how your body processes cholesterol and increases inflammation in blood vessels.

Age is a major risk factor as plaque builds up over time. Men over 75 and women over 75 have the highest risk. Family history matters, especially if close relatives had stroke or heart disease before age 55. Other risk factors include obesity, lack of physical activity, unhealthy diet, and chronic inflammation. Sleep apnea and high stress levels may also contribute to arterial damage over time.

How it's diagnosed

Doctors use several tests to diagnose carotid artery disease. A carotid ultrasound uses sound waves to create images of your carotid arteries and measure blood flow. This painless test can detect plaque buildup and show how narrow your arteries have become. Your doctor may also listen to your neck with a stethoscope for abnormal sounds called bruits, which indicate turbulent blood flow.

Blood tests help assess your risk by measuring cholesterol levels and other factors. Direct LDL cholesterol testing shows how much artery-clogging cholesterol is in your blood. Additional imaging may include CT angiography or MR angiography, which provide detailed pictures of your arteries. Some people may need a cerebral angiogram, where dye is injected to see blood vessel blockages on X-rays. Talk to your doctor about which tests are right for your situation.

Treatment options

Quit smoking immediately to stop further artery damage and reduce stroke risk
Eat a heart-healthy diet low in saturated fat, trans fat, and sodium
Exercise regularly, aiming for at least 150 minutes of moderate activity per week
Maintain a healthy weight to reduce strain on your cardiovascular system
Control blood pressure through medication and lifestyle changes as needed
Take statins or other cholesterol-lowering medications to reduce LDL levels
Use antiplatelet drugs like aspirin to prevent blood clots from forming
Consider surgical procedures like carotid endarterectomy to remove plaque buildup
Explore carotid artery stenting, a less invasive procedure to open narrowed arteries
Manage diabetes carefully to protect blood vessel health

Frequently asked questions

The main cause is atherosclerosis, where plaque made of cholesterol and fat builds up in your artery walls. High LDL cholesterol, smoking, high blood pressure, and diabetes accelerate this process. Over time, plaque hardens and narrows the arteries that supply blood to your brain.

While existing plaque cannot be completely removed without surgery, you can slow or stop its progression. Aggressive cholesterol management, diet changes, exercise, and medications can stabilize plaque and prevent further buildup. Some studies show that very intensive lifestyle changes may slightly reduce plaque over time.

Both involve plaque buildup in arteries, but they affect different blood vessels. Carotid artery disease affects the arteries in your neck that supply blood to your brain, leading to stroke risk. Coronary artery disease affects the arteries supplying your heart, leading to heart attack risk. The same risk factors contribute to both conditions.

Direct LDL cholesterol testing is important because high LDL levels contribute to plaque formation in carotid arteries. Other helpful tests include total cholesterol, HDL cholesterol, triglycerides, and inflammatory markers like high-sensitivity C-reactive protein. Blood sugar tests help identify diabetes, another major risk factor for arterial disease.

Screening recommendations depend on your risk factors. Most medical groups do not recommend routine screening for people without symptoms or risk factors. If you have multiple risk factors like smoking, high cholesterol, high blood pressure, or a family history of stroke, talk to your doctor about appropriate screening intervals.

A carotid bruit is an abnormal whooshing sound your doctor hears through a stethoscope when listening to your neck. It indicates turbulent blood flow through a narrowed carotid artery. While it suggests plaque buildup, not everyone with carotid artery disease has a bruit, and not everyone with a bruit has significant disease.

Carotid endarterectomy and stenting carry some risks, including stroke, heart attack, bleeding, and infection. However, for people with severe narrowing, the surgery risk is usually lower than the stroke risk without treatment. Your surgeon will discuss your specific risk based on the degree of blockage and your overall health.

Yes, diet is a powerful tool for managing this condition. Eating more vegetables, fruits, whole grains, and healthy fats can lower LDL cholesterol and reduce inflammation. Avoiding saturated fat, trans fat, and excess sodium helps protect your arteries. Combined with medication when needed, diet changes can significantly reduce stroke risk.

A transient ischemic attack, or TIA, is a mini-stroke with temporary stroke symptoms that resolve within 24 hours. It happens when blood flow to part of your brain is briefly blocked, often by a blood clot from carotid artery plaque. TIAs are serious warning signs that you are at high risk for a full stroke.

Progression varies widely from person to person. Some people develop significant narrowing over just a few years, while others show slow progression over decades. The rate depends on your cholesterol levels, blood pressure control, smoking status, and other risk factors. Regular monitoring helps track changes in your artery narrowing over time.