AHA/ASA Guidelines for the Definition and Evaluation of Transient Ischemic Attack

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Aysha Anwar, M.B.B.S[2]

Definition

Arguments in favour of definition

Class III

"1." A 24-hour duration of symptoms does not accurately demarcate patients with and without tissue infarction. (Level of Evidence:A ) "

"2." The frequency distribution of durations of transiently symptomatic cerebral ischemic events shows no special relationship to the 24-hour time point.(Level of Evidence:A ) "

Class I

"1." Defining TIA with a 24-hour maximum duration has the potential to delay the initiation of effective stroke therapies(Level of Evidence:C ) "

Class IIa

"1."A tissue-based definition of TIA will harmonize cerebrovascular nosology with other ischemic conditions and appropriately direct diagnostic attention to identifying the cause of ischemia and whether brain injury occurred.(Level of Evidence:C ) "

Arguments against the new definition

Class IIb

"1."(Level of Evidence:) "

"2."(Level of Evidence:) "