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WHO defines stroke by neurological deficit from a cerebrovascular cause that lasts beyond 24 hours or ends in death within 24 hours.
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.” This time-based criterion was intended to reflect the (then-assumed) reversibility of tissue damage and uses an arbitrary 24-hour cutoff to distinguish stroke from related syndromes. Under this WHO framework, symptoms lasting less than 24 hours indicate a transient ischemic attack (TIA), often called a “mini-stroke,” because the neurological deficits resolve completely within that period. The definition emphasizes that the duration of neurological impairment is central to classification, particularly in separating true stroke from transient events.
WHO defines stroke by neurological deficit from a cerebrovascular cause that lasts beyond 24 hours or ends in death within 24 hours.
The 24-hour cutoff separates stroke from transient ischemic attack (TIA), where symptoms resolve completely within 24 hours.
A stroke is a neurological deficit of cerebrovascular cause that persists beyond 24 hours or results in death within 24 hours.
A related syndrome in which stroke-like neurological symptoms resolve completely within 24 hours.
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