transient global amnesia
Definition: a disorder that affects mainly old people who have not sustained a recent head injury and who do not have epilepsy; characterized by the abrupt onset of the inability to form memories (i.e., anterograde amnesia) and the resulting bewilderment; during the episode, which may last minutes to a few hours, the person is fully conscious, oriented, can perform complex activities, and has a normal result on neurologic examination; of uncertain etiology, but currently most often attributed to an ischemic episode affecting the mesial temporal lobe region.
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