Comparison of depth and subdural electrodes in recording temporal lobe seizures.

Publication/Presentation Date

11-1-1989

Abstract

Intracranial EEG recording is often required to identify an area of the brain for resective surgery for intractable epilepsy. We simultaneously compared bilaterally placed depth and limited subdural electrode EEG to determine the most effective method of recording seizures from the temporal lobes. Localized complex partial seizures usually appeared earlier in hippocampal depth electrodes and spread later to subdural recording sites. In 3 patients, hippocampal recordings showed localized seizure origin but subdural recording was nonlocalizing due to rapid bilateral seizure propagation. In 1 patient with nonlocalized seizures presumably of extratemporal origin, subdural electrodes incorrectly lateralized seizure origin to a temporal lobe. Auras and subclinical seizures detected by depth electrode recording were often not evident with subdural electrodes. We conclude that EEG recording with hippocampal depth electrodes correctly identifies and lateralizes temporal lobe seizures more often than with limited subdural electrodes.

Volume

39

Issue

11

First Page

1497

Last Page

1504

ISSN

0028-3878

Disciplines

Medicine and Health Sciences

PubMedID

2812330

Department(s)

Department of Medicine

Document Type

Article

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