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Unfortunately, strokes (sometimes called "brain attacks" can attack any of the previously mentioned areas of the brain. When this happens partial or complete losses of function may occur.
Approximately every 40 seconds, someone in the United States has a stroke. A stroke can happen when the following occurs:
If blood flow is stopped for longer than a few seconds, the brain cannot get blood and oxygen. Brain cells can die, causing permanent damage.
Ischemic stroke is the most common type of stroke. Usually this type of stroke results from clogged arteries, a condition called atherosclerosis. Fat, cholesterol, and other substances collect on the wall of the arteries, forming a sticky substance called plaque. Over time, the plaque builds up. This often makes it hard for blood to flow properly, which can cause the blood to clot. There are two types of clots: A clot that stays in place in the brain is called a cerebral thrombus. A clot that breaks loose and moves through the blood to the brain is called a cerebral embolism.
Other causes of ischemic stroke include:
A clot can form on a heart valve, break off, and travel to the brain. For this reason, those with mechanical or abnormal heart valves often must take blood thinners.
A second major cause of stroke is bleeding in the brain. This is called a hemorrhagic stroke. It can occur when small blood vessels in the brain become weak and burst. Some people have defects in the blood vessels of the brain that make this more likely. The flow of blood that occurs after the blood vessel ruptures damages brain cells.
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