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Extracranial EEG work‐up in epilepsy surgery: usefulness and limitations
Author(s) -
Alving J.
Publication year - 1994
Publication title -
acta neurologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.967
H-Index - 95
eISSN - 1600-0404
pISSN - 0001-6314
DOI - 10.1111/j.1600-0404.1994.tb05176.x
Subject(s) - ictal , electroencephalography , epilepsy , epilepsy surgery , scalp , medicine , eeg fmri , focus (optics) , neuropsychology , neuroscience , psychology , surgery , cognition , physics , optics
Extracranial interictal and ictal EEG provide essential information to diagnosis, seizure/syndrome classification and focus localization. Combined with structural and dynamic neuro‐imaging and neuropsychological data, extracranial EEG will often provide sufficient information in pre‐operative work‐up for temporal lobectomy. Ictal EEG recordings are essential to confirm the diagnosis and classification and, above all, to exclude patients with significant non‐epileptic seizures from further surgical evaluation. The advantage of sphenoidal electrodes lies first and foremost in a more favorable signal/noise ratio, while their superiority to closely placed special scalp electrodes are more debatable.