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Overview

What Is a Carotid Angiogram?

A carotid angiogram is an imaging test that shows blood flow through the carotid arteries, which carry blood from the heart toward the brain. The term commonly refers to catheter-based angiography: a healthcare professional guides a thin catheter into an artery, injects contrast material, and uses X-rays to create detailed images. It can help identify narrowing, blockage, an aneurysm, or another blood-vessel abnormality. A CT angiogram of the brain or neck is different because it uses CT scans and usually injects contrast through an IV rather than placing a catheter in an artery.

When It Is Needed

When Is a Carotid Angiogram Needed?

A carotid angiogram may be considered after symptoms of a stroke or transient ischemic attack, when another scan suggests carotid artery disease, or when a detailed map of the blood vessels is needed before treatment. It is generally ordered because of a specific symptom or suspected abnormality, not as routine age-based screening.

Investigating symptoms that may indicate reduced blood flow to the brain, such as sudden weakness, numbness, vision loss, or trouble speaking.
Clarifying a suspected carotid narrowing or blockage found on ultrasound, CT angiography, or another scan.
Assessing an aneurysm, abnormal blood-vessel connection, dissection, or other vascular problem.
Mapping the arteries before a procedure such as carotid angioplasty or carotid stent placement.

Emergency symptoms

Act quickly for sudden neurologic symptoms

Sudden facial drooping, arm weakness, trouble speaking, sudden vision loss, severe imbalance, or another possible stroke warning sign requires emergency care. Do not wait for an outpatient angiogram; call emergency services immediately.

Preparation

How to Prepare for a Carotid Angiogram

The care team will provide individualized instructions about fasting, arrival time, clothing, medicines, and whether you need a driver or overnight observation. Preparation may differ depending on the contrast agent, sedation plan, kidney function, and whether treatment such as a carotid stent is planned.

Tell the team about allergies or previous reactions to iodinated contrast, kidney disease, diabetes, pregnancy, and all medicines or supplements.
Ask whether blood thinners, diabetes medicines, or other medicines need to be adjusted, and do not stop them without instructions.
Follow the facility’s directions about fasting and permitted clear liquids before the test.
Arrange transportation home if sedation is planned and wear comfortable clothing that allows access to the planned catheter site.

During the Test

What Happens During a Carotid Angiogram?

A carotid angiogram is usually a single hospital or outpatient session. You may remain awake or receive medicine for relaxation while the team monitors your vital signs and uses sterile technique throughout the procedure.

The team places monitoring equipment, cleans the access site, and gives local anesthetic with or without medication for relaxation.
A thin catheter is guided through an artery, usually in the groin or wrist, toward the carotid artery using live X-ray imaging.
Contrast material is injected while X-ray images show blood flow through the neck and brain vessels.
The catheter is removed, pressure or a closure device is applied, and the access site is observed for bleeding.

Risks

What Are the Risks of a Carotid Angiogram?

The catheter site may be sore, bruised, swollen, or mildly bleeding after the test.
Contrast material can rarely cause an allergic reaction or worsen kidney function, particularly in people with existing kidney disease.
The artery can rarely develop a blood clot, narrowing, bleeding under the skin, or damage requiring treatment.
Very rarely, the procedure can contribute to a stroke, heart attack, or other serious neurologic or cardiovascular complication.

Discuss your individual risk

Risks vary from person to person

The clinician weighs the reason for testing, available noninvasive alternatives, kidney function, medication risks, and your overall health before recommending catheter angiography. Ask which risks apply to you and whether a CT angiogram or another test could answer the clinical question.

Recovery

Recovery After a Carotid Angiogram

Recovery begins with observation for bleeding and other immediate problems. You may go home after monitoring or need additional observation, depending on the access site, sedation, findings, and whether treatment such as stenting was performed.

Keep the access site clean and dry and follow the team’s instructions about bathing and dressing changes.
Avoid strenuous activity, heavy lifting, or driving for the time specified by the care team.
Drink fluids if permitted to help clear contrast, unless a clinician has given different fluid instructions.
Take prescribed medicines exactly as directed and attend follow-up appointments to review the images and next steps.

Get medical help promptly

Know the warning signs after discharge

Seek urgent medical help for uncontrolled bleeding, rapidly increasing swelling, severe pain, new weakness or numbness, trouble speaking, vision changes, chest pain, breathing difficulty, or fever.

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