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Transient ischemic attacks (TIAs) are focal neurologic deficits caused by retinal or cerebral vascular disease. They last less than 24 hours. Crescendo TIAs are defined as two TIAs within 24 hours, three within 3 days, or four within 2 weeks. Acute TIA is defined here as a TIA that occurs within 2 weeks of presentation to a physician.

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12y ago

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