TGA typically occurs only once, and although cases of recurrent TGA are described, repeated episodes should alert the clinician to the possibility of transient epileptic amnesia (TEA). Although TGA has an acute onset, it is seldom confused with more dangerous causes of acute amnesia such as viral limbic encephalitis, because the patient is otherwise alert, well and, more often than not, already in the recovery phase by the time of assessment. In single photon emission computed tomography images, transient perfusion defects in the mesial temporal lobe are evident during the episode, 9 which highlights the presence of hippocampal dysfunction even if not identifying the underlying cause. The cause is uncertain, with suggested possibilities including a vascular transient ischemic attack, a seizure, or migraine. After the acute attack resolves, the patient is left with a period of amnesia for the time of the episode. An affected patient is characteristically densely amnesic and appears confused, repeatedly asking questions such as “Where am I?” or “What are we doing?” The event typically lasts for several hours, and during this time there is both anterograde and retrograde amnesia, although knowledge of personal identity is maintained. Transient global amnesia (TGA) is a syndrome of sudden onset, occurring in late middle or old age. Nestor, in Neurology and Clinical Neuroscience, 2007 Transient Global Amnesia
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