Electroencephalography

An electroencephalogram is a non-invasive, harmless, and inexpensive investigational technique. It is mainly used to show epileptic activity. It may also help to differentiate some causes of impaired consciousness and coma. It can help to distinguish the effects of metabolic and toxic changes from cerebral hypoxia, encephalitis, and in some cases subclinical epilepsy. It also reveals characteristic features in conditions such as herpes encephalitis. It may be used to give prognostic information in suspected ischemic damage or head injury. It may also help to differentiate locked-in syndrome from persistent vegetative state.

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