If brain imaging is available the role of electroencephalography ( EEG) is largely confined to the investigation of a deteriorating conscious level and an unexpectedly prolonged unconsciousness, as well as the investigation of unusual behavioural disturbances that may be attributable to epilepsy. However, EEG is not a good predictor of post-traumatic epilepsy.

Non-specific changes are seen on EEG after head injury. An early sign is suppression of the alpha rhythm, while more severe injuries produce diffuse slowing. Haematomas produce localized reduction in amplitude and slowing. Improvements of the EEG correlate with clinical improvement, but the EEG is not a valuable prognostic marker.

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