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As people need food to be properly nourished, your brain — like the rest of your body — also needs to be nourished by oxygenated blood to function normally. Your brain tissues will be damaged or die if they do not receive enough oxygenated blood.
Narrowing or blockages in the carotid arteries, the blood vessels that carry blood from the heart to the brain and head, can decrease the amount of blood reaching your brain. The narrowing or blockage can be caused by a number of diseases, including atherosclerosis (hardening of the walls of the arteries). Medical and surgical treatments are available for narrowing (stenosis) of the carotid arteries. There are fewer treatment options when there is complete blockage (carotid artery occlusion). Both conditions increase the risk of stroke (damage to the brain tissue caused by an interruption of blood supply) or transient ischemic attack (TIA), which is stroke-like symptoms that resolve within a few hours.
Stroke is the number one cause of disability in adults. Researchers reporting in the September 23/30, 1998, issue of The Journal of the American Medical Association found that some people with carotid artery occlusion are at especially high risk for another stroke. Consult your doctor about whether you or your loved ones are at increased risk for stroke, especially if you have high blood pressure or smoke.
Symptoms of Stroke or TIA:
If you experience any of the following symptoms, call an emergency number (such as 911 in the United States and Canada) for ambulance transportation to a hospital emergency department or contact your doctor immediately.
· Sudden disturbances in sight, speech and steadiness
· Sudden mental deterioration and memory loss
· Sudden temporary blindness in one eye or other visual defects
· Sudden numbness, weakness, or paralysis of an arm or leg or an entire side of the body
· Sudden difficulty with speech or the ability to swallow
· Coma or convulsions
What are the Cartoid Arteries?
Large blood vessels on both sides of the neck that deliver blood from the heart to the head and brain.
Stenosis vs. Cartoid Artery Occlusion:
Stenosis refers to narrowing of the arteries that results in partial blockage. A blood clot or piece of fatty plaque that interferes with the passage of blood can cause the narrowing or the blockage. Carotid artery occlusion is the complete blockage of a carotid artery that decreases blood flow to the brain.
Detection of Stenosis:
Your doctor may use a stethoscope to listen for a bruit (a sound made by abnormal blood flow through an artery) over the carotid artery in the neck. A carotid bruit may indicate carotid artery disease. Your doctor can confirm partial blockage of the carotid arteries by using ultrasound scans or a special X-ray test called angiography.
When Do You Need Surgery?
Carotid endarterectomy is a surgical procedure that removes blockages from the carotid arteries. Surgery may be recommended for people who have more than 60 percent obstruction of one or both carotid arteries with or without symptoms of stroke or TIAs. Surgery may not be recommended for people with complete blockage or who are recovering from acute stroke.