The World Health Organization defines a stroke as ‘rapidly developing clinical signs of focal (or global) disturbance of cerebral function, with symptoms lasting 24 hours or longer or leading to death, with no apparent cause other than vascular origin’. If the symptoms last less than 24 hours, typically less than 2 hours, then this is classified as a transient ischaemic attack. ‘Brain attack’ is a term that is increasingly used, as the rapid nature of treatment means the differentiating criterion of symptoms lasting at least 24 hours, is often not met before initiation of treatment.
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