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Carotid Doppler Ultrasound is a non-invasive test that uses sound waves to measure the flow of blood through the large carotid arteries that supply blood to the brain. These arteries can narrow due to arteriosclerosis or other causes
and this can lead to TIA (mini-stroke) or CVA (stroke). This test can help doctors to determine stroke risk and help determine preventive measures.
Why do I Need To Have a Carotid Doppler?:
If you have had a TIA your doctor may order a carotid doppler to evaluate your carotid arteries. If there is narrowing of the one or both of these major arteries it is highly probable that the TIA was caused by this narrowing. Additionally if you have had a TIA caused by carotid stenosis (narrowing) you are at much higher risk of having a large stroke. If stenosis is diagnosed there are treatments avaialable that can help open up the arteries and prevent a large stroke.
How is a Carotid Doppler Performed?:
The ultrasound technician will apply a jelly like substance to both sides of your neck. This helps lubricate the skin and allow the ultrasound sensor to move more freely on your skin. The sensor is moved back and forth over the neck area where the carotid arteries are located. The senor generates sound waves that bounce off the arteries. The echo that bounces back is measured and the changes in frequency can measure the flow of blood. The flow will be different in areas that are narrowed. This test takes an average of 15 - 30 minutes for most people, though it can vary for some. Once the test is completed you will be free to resume normal activities with no restrictions. The technician may offer a towelette to remove the remaining lubricant on your neck.The completed test is recorded on a videotape by the ultrasound technician. The tape is reviewed by a diagnostic radiologist who measures the blood flow and determines the amount and location of any narrowing of the carotid arteries. The radiologist will send a report to your doctor. The results should be available within a few days at most.
