Carotid Ultrasound

A carotid ultrasound is a safe, non-invasive test that uses sound waves to create pictures of the two main arteries in your neck, called the carotid arteries. This painless procedure helps doctors check for narrowing or blockages caused by fatty deposits (plaque), which can increase your risk of stroke. It provides important information about blood flow to your brain.

What is Carotid Ultrasound?

A carotid ultrasound is a safe, non-invasive test that uses sound waves to create images of the two main arteries in your neck, called the carotid arteries. This test helps your doctor see if there is any narrowing or blockage in these arteries, often caused by fatty deposits called plaque.

The carotid arteries are vital blood vessels located on each side of your neck. They carry oxygen-rich blood from your heart directly to your brain. Keeping these arteries clear is crucial for maintaining good brain health and function. During the ultrasound, a special device sends high-frequency sound waves into your body. These sound waves bounce off your blood vessels and blood cells. A computer then uses these echoes to create live, moving images of your carotid arteries on a screen. The test specifically looks for a buildup of plaque (fatty deposits) inside the arteries. Plaque can make the arteries narrow, a condition called stenosis. Severe narrowing can significantly reduce blood flow to your brain and increase your risk of a stroke. Sometimes, a piece of plaque can break off and travel to the brain, causing a stroke. The ultrasound can also detect blood clots within the arteries, which can also impede blood flow and pose a stroke risk.

Why it's ordered

Your doctor might order a carotid ultrasound to assess your risk of stroke, especially if you have certain health conditions or symptoms. It helps identify narrowing or blockages in your carotid arteries before they cause serious problems. This test is also used to investigate symptoms like dizziness or fainting.

Doctors often order this test if you have risk factors for stroke. These include high blood pressure (hypertension), high cholesterol, diabetes, and a family history of stroke or heart disease. Smoking is another significant risk factor that can damage arteries over time. You might also need a carotid ultrasound if your doctor hears an abnormal sound, called a bruit, when listening to your neck with a stethoscope. A bruit can sometimes indicate turbulent blood flow in a narrowed artery, suggesting a potential blockage. The test is also used if you have experienced symptoms that suggest a temporary lack of blood flow to the brain. These symptoms might include temporary weakness, numbness, or difficulty speaking, known as a transient ischemic attack (TIA) or "mini-stroke." In some cases, a carotid ultrasound is performed to monitor the carotid arteries after surgery, such as a carotid endarterectomy, to ensure blood flow remains healthy and to check for any new plaque buildup.

How to prepare

Preparing for a carotid ultrasound is usually simple and requires no special dietary restrictions or fasting. You should wear comfortable clothing and avoid wearing jewelry around your neck. Inform your doctor about any medications you are taking, though most can be continued as usual.

Generally, there is no special preparation needed for a carotid ultrasound. You can eat and drink as you normally would before the test, and there are no dietary restrictions. It is best to wear loose, comfortable clothing that allows easy access to your neck. Avoid wearing turtlenecks, collared shirts, or any clothing that might obstruct the area where the technician needs to place the ultrasound probe. You should also remove any necklaces, earrings, or other jewelry from your neck and ears before the procedure. These items could interfere with the ultrasound images or make it difficult for the technician to position the transducer correctly. You can usually continue taking your regular medications unless your doctor gives you specific instructions otherwise. Always discuss your medications and any concerns with your healthcare provider before your appointment.

What to expect during

During a carotid ultrasound, you will lie on your back while a technician applies a warm gel to your neck. A small handheld device, called a transducer, is then gently moved over the skin. The test is painless and typically takes about 30 minutes to an hour to complete.

You will lie on your back on an examination table, often with your head slightly tilted to one side. This position helps the technician access your neck easily and ensures clear imaging of the carotid arteries. A clear, water-based gel will be applied to your neck over the area of your carotid arteries. This gel helps the sound waves travel effectively between the transducer and your skin, preventing air pockets that could distort the images. The technician will then press the transducer gently against your skin and move it around to capture images from different angles. You might feel a slight pressure, but it should not be painful. You may also hear whooshing sounds, which are the sounds of blood flowing through your arteries, amplified by the ultrasound machine. The entire procedure usually takes about 30 minutes to an hour. After the test, the gel will be wiped off, and you can typically resume your normal activities immediately without any recovery period.

Understanding your results

Your doctor will explain the results of your carotid ultrasound, which will show if your carotid arteries are clear or if there is any plaque buildup or narrowing. Results are generally described as normal or abnormal, indicating the presence and severity of any blockages. These findings help guide your treatment plan.

A radiologist, a doctor specializing in medical imaging, will interpret the ultrasound images and measurements. They will then send a detailed report to your referring doctor, who will discuss the findings with you. A "normal" result means that your carotid arteries are open, and blood flows freely without significant narrowing or blockages. This indicates a lower immediate risk of stroke related to carotid artery disease. An "abnormal" result indicates that plaque has built up in your arteries, leading to narrowing (stenosis) or blockages. The report will usually describe the degree of narrowing, such as mild, moderate, or severe. Your doctor will explain what these classifications mean for your health. Your doctor will discuss these results with you in the context of your overall health, symptoms, and other risk factors. They will explain what the findings mean for your specific situation and recommend any necessary follow-up tests or treatments. Never try to interpret your own results without your doctor's guidance.

Risks

A carotid ultrasound is a very safe and non-invasive procedure with no known risks. It does not use radiation, unlike some other imaging tests. You will not experience any pain or side effects during or after the test, making it a low-risk option for evaluating your carotid arteries.

Carotid ultrasound is considered a very safe medical test. It uses high-frequency sound waves, not radiation, to create images of your arteries. This means there is no exposure to ionizing radiation, which is a concern with some other imaging techniques. There are no known risks or complications associated with having a carotid ultrasound. You will not feel any pain during the procedure, and there are no side effects from the sound waves or the gel used on your skin. This non-invasive nature makes it a preferred method for screening and monitoring carotid artery health. It is a painless, quick, and comfortable procedure for most individuals. You can return to your normal daily activities immediately after the test without any recovery period. There are no restrictions on driving, eating, or other activities.

Frequently asked questions

How long does a carotid ultrasound take?

A carotid ultrasound typically takes about 30 minutes to an hour to complete. The exact time can vary slightly depending on the individual and the specific details the technician needs to capture.

Is a carotid ultrasound painful?

No, a carotid ultrasound is a painless procedure. You might feel a slight pressure as the technician moves the transducer over your neck, and the gel may feel cool, but there should be no discomfort or pain.

Can I eat or drink before a carotid ultrasound?

Yes, you can usually eat and drink normally before a carotid ultrasound. There are typically no special dietary restrictions or fasting required for this test.

What does it mean if they find plaque in my carotid arteries?

Finding plaque means there are fatty deposits in your carotid arteries. This can lead to narrowing (stenosis) and may increase your risk of stroke. Your doctor will assess the amount and severity of plaque to determine the best course of action.

What is a "bruit" and why is it important for a carotid ultrasound?

A "bruit" is an abnormal whooshing sound your doctor might hear with a stethoscope when listening to your neck. This sound can indicate turbulent blood flow, often caused by narrowing in a carotid artery, and is a common reason for ordering a carotid ultrasound.

Does a carotid ultrasound use radiation?

No, a carotid ultrasound does not use radiation. It uses high-frequency sound waves to create images of your arteries. This makes it a very safe procedure with no radiation exposure.

Sources

• MedlinePlus — Carotid Ultrasound
• Mayo Clinic — Carotid Ultrasound
• Cochrane Library — Carotid Ultrasound