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High-frequency oscillations and mesial temporal lobe epilepsy.

Maxime Lévesque1, Zahra Shiri1, Li-Yuan Chen1

  • 1Montreal Neurological Institute and Department of Neurology & Neurosurgery, McGill University, 3801 University Street, Montréal, QC, H3A 2B4, Canada.

Neuroscience Letters
|January 25, 2017
PubMed
Summary

High-frequency oscillations (HFOs) in EEG, like ripples and fast ripples, are microscopic events linked to epilepsy. These HFOs may serve as biomarkers for seizure generation and development.

Keywords:
EpileptogenesisFast ripplesHigh-frequency oscillationsIctogenesisMesial temporal lobe epilepsyRipples

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Area of Science:

  • Neuroscience
  • Epileptology
  • Signal Processing

Background:

  • Epileptologist interest has shifted to microscopic EEG events, specifically high-frequency oscillations (HFOs).
  • New technologies enable multichannel recordings and automated analysis of extensive EEG data.
  • HFOs, categorized as ripples (80-200Hz) and fast ripples (250-500Hz), are not visible without filtering.

Purpose of the Study:

  • To review presumptive cellular mechanisms of ripples and fast ripples in mesial temporal lobe epilepsy (MTLE).
  • To focus on recent findings regarding HFO occurrence during epileptiform activity.
  • To address the effects of anti-epileptic drugs (AEDs) on HFOs and related definitional issues.

Main Methods:

  • Review of existing literature on HFOs in epilepsy.
  • Analysis of HFOs in in vitro models of epileptiform synchronization.
  • Examination of HFOs in in vivo models of MTLE and in human epileptic patients.

Main Results:

  • HFOs are proposed to reflect pathological neural network activity underlying seizure generation.
  • HFOs have been observed during epileptiform activity in various experimental models and in epileptic patients.
  • The effects of anti-epileptic drugs on HFOs are a subject of ongoing investigation.

Conclusions:

  • HFOs, including ripples and fast ripples, hold potential as biomarkers for epileptogenesis and ictogenesis.
  • Further research is needed to clarify cellular mechanisms, standardize HFO definitions, and understand AED effects.
  • Microscopic EEG analysis, particularly of HFOs, represents a significant advancement in epilepsy research.