They take place when a blood clot obstructs the brain's ability to receive oxygen and blood. These blood clots usually occur in places where fatty deposits (plaques) have over time restricted or obstructed the arteries. Atherosclerosis is the term for this process. A stroke is characterized by an abrupt stoppage of blood flow to the brain, which impairs neurological function. Blockages can cause an ischemic stroke, which is more common, or hemorrhagic strokes, which are more deadly, can be caused by bleeding in the brain. Roughly 87% of stroke cases are caused by an ischemic stroke. Stroke often occurs suddenly and with little warning, with potentially fatal results. Restoring sufficient blood flow and oxygen supply to the brain as soon as feasible is essential. In a matter of minutes, the damaged or dead brain cells are caused by a lack of oxygen and vital nutrients. Brain cells that die cannot be revived and can result in severe harm.
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