Brain Ischemia [Disease/Finding] Ischemic Attack, Transient [Disease/Finding] Brain TIA Ischemic Attack, Transient TIA (Transient Ischemic Attack) C0007787 N0000000724 Transient Ischemic Attack C1626 1023504 M0003887 266257000 313242003 Brief reversible episodes of focal, nonconvulsive ischemic dysfunction of the brain having a duration of less than 24 hours, and usually less than one hour, caused by transient thrombotic or embolic blood vessel occlusion or stenosis. Events may be classified by arterial distribution, temporal pattern, or etiology (e.g., embolic vs. thrombotic). (From Adams et al., Principles of Neurology, 6th ed, pp814-6) Ischemic Attack, Transient D002546