Transient global amnesia
Attacks must be witnessed and information must be available from a capable observer.
Clear-cut anterograde amnesia must be present during the attack.
Clouding of consciousness and loss of personal identity must be absent and cognitive impairment must be limited to amnesia.
There must be no accompanying focal neurological symptoms or signs, and epileptic features must be absent.
Attacks must resolve within 24 hours.
Patients with a recent head injury or known active epilepsy are excluded.
Patients with many other clinical �entities may present with amnesia and these may need to be ruled out before the diagnosis of TGA can be made. These conditions include alcoholic “blackouts,” TIA (transient ischemic attack), temporal lobe epilepsy, brain tumor, drug reactions, and intracerebral or subarachnoid hemorrhage.
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