Stroke is a disease that affects the blood vessels that supply blood to the brain. A blood vessel that brings oxygen and nutrients either bursts or clogged by a blood clot.
When such a thing happens, part of the brain does not get the blood and oxygen needed. The brain cells in the affected part of the brain cannot function and they die. The part of the body they control will not be able to function. The effects of a severe stroke are permanent as the dead brain cells are not getting replaced.
There are two types of strokes -- ischemic and hemorrhagic. Ischemic stroke is the common one and contributes to 87 percent of all strokes. This occurs when a blood clot forms and blocks blood flow in an artery bringing blood to a part of the brain.
A wandering clot that forms away from the brain usually in the heart is carried by the blood stream and it lodges in the artery leading to the brain and this also can block the flow of the blood and cause a stroke.
A blood vessel on the brain’s surface ruptures and bleeds into the space between the brain and the skull. This is called hemorrhage stroke. A cerebral hemorrhage occurs when a defective artery in the brain bursts flooding the surrounding tissue with blood. Accumulated blood from burst artery may put pressure on the surrounding brain tissue and can cause interference with the functioning of the brain. The pressure from the blood compresses a part of the brain but does not cause damage to the cells. If the person survives, gradually the pressure gets reduced. The brain may be able to regain some of the former functions.
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