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Electroencephalographic studies of simple partial seizures with subdural electrode recordings

Medical Neurology Branch, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD (Drs. Devin sky, Theodore, and Porter)
EEG Laboratory, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD (Drs. Sato, Ito, and Rose)
Surgical Neurology Branch, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD (Dr. Kufta).

We used subdural electrodes to study the EEG features of simple partial seizures in 7 patients. We detected epileptiform discharges in 61 of 68 subdually recorded simple partial seizures compared with 6 of 55 simple partial seizures recorded with scalp electrodes (p < 0.0001). The onset of 36 nonmotor simple partial seizures was detected only by the medial and basal temporal subdural electrodes, and the onset of 25 simple partial seizures with motor manifestations was recorded by subdural electrodes only from the lateral cortex of the posterior frontal lobe. There was a close correspondence between the area first involved in the epileptiform discharge during simple partial seizures and the area first involved during complex partial and secondary generalized tonic-clonic seizures. Subdural electrodes may be effective in localizing the onset and spread of simple partial seizures, including those that arise from the medial temporal lobe.

Address correspondence to Dr. Devin sky, Department of Neuroscience. University of Medicine and Dentistry of New Jersey, Newark, NJ 07103. Address reprint requests to Dr. Sato, Building 10, Room 5C408, NINDS, NIH, Bethesda, MD 20892.

Received June 21,1988. Accepted for publication in final form October 19,1988.

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