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What is the difference between a stroke and a transient ischemic attack (TIA)?

The World Health Organization (WHO) defined a stroke as a “neurological deficit of cerebrovascular cause that persists beyond 24 hours or is interrupted by death within 24 hours.” The 24-hour limit is what many people use to separate a stroke from a TIA. TIAs (also known as mini-strokes) normally resolve within 24 hours and typically leave no lasting impairment.

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