Monitoring at the National Hospital, Queen Square, London

At the National Hospital, video-EEG telemetry is performed on about 100 patients per year and ambulatory EEG recordings on about 40 patients per year. For clarification of the diagnosis of odd attacks of uncertain cause 55% of the patients are selected, and 35% for the investigation of established epilepsy. The equipment employed for the long-term EEG monitoring is described. The results obtained during 1983 are discussed in detail; clinically useful results are obtained in over 50% of the patients.