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transient ischemic attack. a sudden episode of temporary symptoms typically due to diminished blood flow through the brain, usually defined as lasting between 24 and 48 hours. It is sometimes related to impaired blood flow through the vertebrobasilar vessels.
A transient ischemic attack (TIA) is an episode in which a person has stroke -like symptoms for less than 24 hours, usually less than 1-2 hours. Transient ischemic attacks (TIAs) are caused by tiny emboli (clots often formed of pieces of calcium and fatty plaque) that lodge in an artery to the brain.