Update @0.20: Transient ischemic attack is now defined as a transient episode of neurologic dysfunction caused by focal brain, spinal cord or retinal ischemia without acute infarction.
Time-based definition of TIA is inadequate because there is risk of permanent tissue injury (i.e., infarction) even when focal transient neurologic symptoms last less than one hour.
Transient Ischemic Attack
Instructional Tutorial Video
CanadaQBank.com
Video: http://youtu.be/NpzXaO8JGo4
