Abstract

The duration of a normal electroencephalographic (EEG) examination is relatively short. The chance of obtaining clinically relevant information from a conventionally recorded EEG in epileptic patients is small due to the unpredictable timing of epileptiform EEG phenomena. Therefore, in order to facilitate the diagnosis and the treatment of epileptic patients, great clinical interest lies in carrying out longterm (24 h) EEG recording in epileptic patients, who preferably are able to perform normal daily activities. This results in technical problems of EEG recording and the generation of an enormous amount of EEG data which has to be stored and analyzed if no provision is made for selective registration of the clinically relevant parts of the record. We constructed a modular EEG-telemetry system which permits a longterm registration of 16 EEG signals from relatively free moving patients. The basic module of this system is formed by a small, portable 16 channel EEG-amplifier which feeds into a pulse code modulation (PCM) module. To date cable telemetry has been used for recording the EEG before, during and after an epileptic seizure. In order to obtain the desired data reduction, the system has been used in conjunction with a computerized buffer memory which provides selective registration and storage of the relevant parts of the record. The patient is under video monitoring (VTR) throughout, and elapsed time is registered both on the VTR and on the EEG.

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