Cerebrovascular Disorders

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Definitions

Stroke is a sudden neurologic deficit caused by either ischemia (80%)
or hemorrhage (20%). Ischemic stroke is classified according to the
area of the brain affected and the etiologic mechanism. Hemorrhagic
stroke is classified as either subarachnoid (5%) or intracerebral
(intraparenchymal) (15%). Transient ischemic attack (TIA) is a sudden
vascular-related focal neurologic deficit that resolves completely.
TIAs are classically defined as lasting less than 24 hours; they
generally last less than 1 hour. A TIA should not be considered a
separate entity but, rather, a herald of ischemic stroke and an
opportunity to intervene.