Brain blood vessels can burst, or emboli can block blood vessels {stroke}| {apoplexy}. One-sixth of strokes involve cerebral-hemorrhage bleeding. Five-sixths of cases involve artery blockage, causing brain-tissue infarction.
causes
Main cause is hypertension. Atheroma can cause stenosis. Occlusion or embolism can weaken vessels, leading to breaking and bleeding.
effects
First, one body side has arm and leg weakness {hemiplegia, stroke}. Brainstem pressure coning can cause drowsiness, unconsciousness, respiratory paralysis, and ultimately death. Low oxygen can cause consciousness loss. About one-third of patients die within three weeks. Stroke is third major death cause in USA and Europe, in 0.2% of people each year, three quarters in seniors. Survivors often have partial arm or leg paralysis.
Biological Sciences>Medicine>Disease>Kinds>Organ>Circulation>Blockage
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Date Modified: 2022.0224