The use of electroencephalography over a three year period in a large mental handicap hospital was studied. There were no significant differences in its use according to sex or intelligence. The majority of requests were made following seizures and in the investigation of behavioural abnormality. In over a quarter of cases the EEG requests appeared to be inappropriate. It is suggested that a more cost-effective use would result if EEGs were requested only in those cases in which the result will lead to a change in the management of the patient.
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