Combined use of sphenoidal electrodes and the dipole localization method for the identification of the mesial temporal focus

Harumi Yoshinaga, J. Hattori, T. Nakahori, Y. Ohtsuka, E. Oka, S. Tomita, T. Ohmoto, K. Miyamoto

Research output: Contribution to journalArticle

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Abstract

We attempted to sub-classify four cases who show temporal spikes on standard scalp electroencephalogram (EEG), using sphenoidal electrodes and the dipole localization method. In a case with mesial temporal epilepsy, spikes showed phase reversal in a sphenoidal electrode, and the spike dipoles were estimated to be in the mesial temporal lobe. In a case with lateral temporal epilepsy, spikes showed no phase reversal in a sphenoidal electrode, and the spike dipoles were estimated to be in the lateral temporal lobe. In two cases out of four, spikes showed phase reversal in sphenoidal electrodes, whilst the dipoles were estimated to be in the frontal lobe. Clinical features also suggested a diagnosis of frontal lobe epilepsy. In one of the two cases in which frontal lobe epilepsy was suspected, ictal dipoles as well as interictal spike dipoles indicated participation of the frontal lobe in the genesis of seizures. Nevertheless, only mesial temporal lobectomy was performed based on results obtained by invasive subdural electrodes. As a result, seizures were not controlled. Although sphenoidal electrodes were useful for differentiating between mesial and lateral temporal lobe loci, it is advisable to use them in combination with the dipole localization method to identify frontal lobe foci.

Original languageEnglish
Pages (from-to)149-156
Number of pages8
JournalEuropean Journal of Neurology
Volume8
Issue number2
DOIs
Publication statusPublished - 2001

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Keywords

  • Dipole localization method
  • Mesial temporal lobe epilepsy
  • Sphenoidal electrode
  • Temporal spike
  • Zygomatic electrode

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)

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