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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.
What is a transient ischemic attack? A transient ischemic attack (TIA) happens when blood flow to part of the brain is blocked or reduced, often by a blood clot. After a short time, blood flows again and the symptoms go away. With a stroke, the blood flow stays blocked, and the brain has permanent damage.