Carotid Ultrasound and Stroke Prevention

By Dr. Gabriel Grabowski, specialist in internal medicine and pulmonology

I often discuss cardiovascular risk with patients over 50. One question is whether an ultrasound of the neck arteries can help assess the risk of stroke. It can provide useful information in selected situations, but it is not a test that everyone needs.

When I discuss this examination, I explain both what it can show and what it cannot. Understanding plaque, personal risk factors and the limits of testing helps us decide whether an ultrasound is appropriate.

What the carotid arteries can tell us

The carotid arteries run along either side of the neck and supply blood to the brain. Over time, deposits containing cholesterol, inflammatory cells and calcium can develop in their walls. These deposits are called atherosclerotic plaques.

Plaque is not simply a consequence of getting older. Its development is influenced by blood pressure, cholesterol, smoking, diabetes and other factors. Some plaques cause little narrowing; others reduce the space available for blood flow more substantially.

A stroke may occur if a clot forms on a plaque and material travels into a smaller artery in the brain. However, carotid disease is only one possible cause of stroke. Heart rhythm disturbances such as atrial fibrillation and disease of smaller blood vessels also matter.

Finding plaque does not mean that a stroke is inevitable. Equally, a normal carotid ultrasound does not exclude every source of stroke risk.

A painless look at blood flow

Carotid ultrasound is a non-invasive examination that uses sound waves rather than radiation. It is usually painless and does not normally require needles, injections or special preparation.

During the examination, you lie on your back with your head turned slightly to one side. Gel is applied to the neck, and a small probe is moved over the skin. You may feel light pressure. Let the examiner know if your neck is uncomfortable.

The images show the artery walls and any visible plaque. A Doppler assessment measures the speed and direction of blood flow, helping estimate whether an artery is narrowed. The examination commonly takes around 15–30 minutes, although this varies.

Ultrasound findings need to be interpreted alongside symptoms, medical history and other results. If significant narrowing is suspected, further imaging or specialist assessment may be needed before treatment decisions are made.

Who may benefit from the examination?

I do not recommend carotid ultrasound automatically because someone has reached a particular age. Routine screening of adults without symptoms is generally not recommended: unclear or misleading findings can lead to further tests and procedures without a clear overall benefit.

An examination may be appropriate after certain neurological symptoms, in someone with known carotid narrowing, or when a clinician identifies another specific reason. A sound heard over the artery with a stethoscope may prompt assessment, but it does not reliably indicate the degree of narrowing.

For an individual risk assessment, I review factors including:

• High blood pressure and elevated cholesterol
• Smoking or previous tobacco exposure
• Diabetes and chronic kidney disease
• Previous stroke, transient ischaemic attack (TIA), or cardiovascular disease
• Family history, physical activity and dietary habits

These factors help guide care, but having one or more does not automatically mean that an ultrasound is necessary.

Putting the findings into perspective

If plaque is found, the next step is usually a discussion of overall cardiovascular risk. The amount of narrowing, any symptoms, existing medication and general health all influence the plan.

Measures may include stopping smoking, regular physical activity adapted to your abilities, a balanced diet, and treatment of high blood pressure, diabetes or elevated cholesterol. Medication decisions are individual; do not start aspirin or change prescribed treatment on your own.

A procedure to treat carotid narrowing is considered only in selected circumstances after weighing expected benefits against risks. Not every plaque requires an intervention or repeated scans.

Symptoms deserve timely attention

Sudden facial drooping, weakness or numbness on one side, difficulty speaking, or sudden loss of vision can indicate a stroke or TIA. Call emergency services immediately, even if the symptoms disappear. Do not wait for a routine appointment or an ultrasound; urgent assessment is needed.

For non-urgent questions about your personal risk, I encourage a medical consultation to review your history and decide which examinations, if any, are useful. Consultations are possible at the three practices in Nürnberg, La Cala de Mijas and Estepona.

This article is general information and does not replace a personal medical consultation.