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transient ischemic attack(TIA) a sudden episode of temporary symptoms caused by a lessening of blood flow through the brain, usually lasting one or two days; it is sometimes related to impaired blood flow through the vertebral or basilar arteries. Symptoms can range from obvious loss of sensation or motor function to more subtle changes in speech or mental function, and should be seen as warning signals of impending stroke syndrome; approximately one in three persons having a TIA will have stroke syndrome within 5 years.
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