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Complex observation of scalp fast (40-150 Hz) oscillations in West syndrome and related disorders with structural

Katsuhiro Kobayashi1,2, Fumika Endoh1,2, Takashi Agari2,3

  • 1Department of Child Neurology Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences and Okayama University Hospital Okayama Japan.

Epilepsia Open
|March 29, 2018
PubMed

Insights

Fast oscillations (FOs) on scalp EEG show varied distribution related to brain lesions in pediatric epilepsy syndromes. Concordance was observed in some cases, while others showed inverse or inconsistent patterns, highlighting lesion type as a factor.

Area of Science:

  • Pediatric Neurology
  • Neurophysiology
  • Epileptology

Background:

  • West syndrome (WS) and related epileptic encephalopathies present diagnostic challenges.
  • Understanding the electrophysiological correlates of structural lesions is crucial for patient management.

Purpose of the Study:

  • To investigate the relationship between scalp electroencephalogram (EEG) fast oscillations (FOs) and epileptogenic lesions in pediatric epilepsy.
  • To determine if FOs distribution correlates with the location and nature of cerebral pathology.

Main Methods:

  • Analysis of scalp EEG data from 9 pediatric patients with surgically confirmed epileptogenic lesions.
  • Detection and examination of the scalp distribution of fast oscillations (40-150 Hz).
  • Correlation of FOs distribution with lateralization of cerebral pathology, including atrophy and hypoplasia.

Main Results:

  • In 5 out of 9 patients, FOs distribution was concordant with the lateralization of cerebral pathology.
  • One patient showed FOs dominant over the healthy hemisphere with reduced EEG amplitude over the pathological hemisphere.
  • In 3 patients, FOs dominance was inconsistent, with 2 exhibiting reduced hemisphere volume potentially due to atrophy or hypoplasia.

Conclusions:

  • The scalp distribution of fast oscillations shows a complex relationship with epileptogenic lesions in pediatric epilepsy.
  • Further research is needed to understand the factors influencing FOs and their precise correlation with lesion type and severity.
  • Considering lesion characteristics is important when evaluating the correspondence between FOs and epileptogenic zones.

Keywords:
Cortical dysplasiaFast oscillationsHemimegalencephalyInfantile spasms

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