What Is a Carotid Intima-Media Thickness (CIMT) Test?

Carotid Intima-Media Thickness (CIMT) Test

A carotid intima-media thickness (CIMT) test is an ultrasound of the carotid arteries, which are located on each side of the neck. It measures the thickness of the inner lining (intima) and the middle layer (media) of the carotid arteries. A thick intima-media may be an early sign of atherosclerosis, or hardening of the arteries.

Why is a CIMT test performed?

A CIMT test may be performed to:

* Screen for atherosclerosis

* Assess an individual's risk for cardiovascular events, such as heart attack or stroke

* Monitor the progression of atherosclerosis

* Evaluate the effectiveness of treatment for atherosclerosis

How is a CIMT test performed?

A CIMT test is performed by an ultrasound technician. You will be asked to lie on your back with your head turned to one side. The technician will use a small, hand-held ultrasound transducer to scan the carotid arteries on both sides of your neck. The transducer emits high-frequency sound waves that bounce off the walls of the arteries, creating an image of the arteries on a monitor. The thickness of the intima and media is measured at several points along the carotid arteries.

What happens after a CIMT test?

You may experience some discomfort during the CIMT test, such as pressure or bruising on the neck. However, the test is generally safe and there are no known complications.

The results of your CIMT test will be sent to your doctor. Your doctor will review the results and discuss them with you. If the test shows that you have a thick intima-media, your doctor may recommend lifestyle changes, such as diet and exercise, to reduce your risk of heart attack and stroke.