Stroke is acute disturbance of one or more of the functions of the brain due to blood and/or oxygen flow interruption. According to the cause of interruption, two forms of stroke can be outlined; ischemic and hemorrhagic. Ischemic stroke results from blockage of a blood vessel supplying the brain, while hemorrhagic stroke results from bleeding into or around the brain that compromises blood/oxygen supply. Stroke is usually associated with death of some of the brain cells (neurons). It may lead to reversible or irreversible loss of function.
The symptoms of a stroke include sudden numbness (sensory deficit) or weakness (motor deficit), especially on one side of the body; sudden loss of motor function on one side of the body - called hemiplegia; sudden severe headache; sudden confusion or trouble speaking (aphasia or dysphasia) or understanding speech; sudden trouble with vision in one or both eyes; sudden trouble with walking, dizziness, or loss of balance or coordination (dysequilibrium).
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