Vertebrobasilar insufficiency is poor blood flow to the back of the brain. This is due to damaged blood vessels (arteries). Blood flow to the back of the brain is supplied by two arteries of the neck. These two arteries join to form the basilar artery.
A decrease in blood flow can damage the brain and impair normal function.
Vertebrobasilar insufficiency is caused by a narrowing or damage of the arteries. The most common cause is
atherosclerosis, a build-up of plaque in blood vessels. Plaque is a fatty substance in the blood.
Plaque buildup makes it hard for blood to flow through the blood vessels. In time, it can completely block the artery.
The blood vessels may also be damaged due to a birth defect.
Things that can raise the risk of vertebrovascular insufficiency are:
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