"Chronic" electrodes in SEEG exploration of partial epilepsies

The advantages of the stereoelectroencephalographic study of epileptic patients prior to surgical treatment through "chronically" implanted multielectrodes are illustrated and discussed. The reliability of the information provided by the cerebral electrical activity is strengthened by recording the patient on different days, in different physiological conditions and under different pharmacological treatment. The consistency of some of the electrical abnormalities recorded gives them a strong diagnostic value.