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Related Experiment Video

Updated: Oct 5, 2025

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
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Scalp HFO rates decrease after successful epilepsy surgery and are not impacted by the skull defect resulting from

Dorottya Cserpan1, Antonio Gennari1,2, Luca Gaito1,3

  • 1Department of Neuropediatrics, University Children's Hospital Zurich, Steinwiesstrasse 75, 8032, Zurich, Switzerland.

Scientific Reports
|January 26, 2022
PubMed
Summary
This summary is machine-generated.

High-frequency oscillations (HFOs) detected via scalp EEG reliably predict seizure freedom after epilepsy surgery in children. Skull defects from surgery do not impede HFO detection, supporting their use in guiding treatment.

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Area of Science:

  • Neuroscience
  • Clinical Neurology
  • Biomarkers

Background:

  • Epilepsy surgery offers seizure freedom for select pediatric patients.
  • Predicting postsurgical seizure freedom remains challenging.
  • High-frequency oscillations (HFOs) in scalp EEG are a potential biomarker for treatment response.

Purpose of the Study:

  • To investigate if skull defects from craniotomy affect postsurgical HFO detection in pediatric epilepsy.
  • To determine the reliability of scalp HFOs as predictors of seizure freedom post-epilepsy surgery.

Main Methods:

  • Analyzed EEG data from 14 children with focal lesional epilepsy before and after surgery.
  • Utilized an automated HFO detector on presurgical and postsurgical EEG recordings.
  • Correlated HFO rates with seizure frequency and proximity to skull defects identified via MRI.

Main Results:

  • HFO rates positively correlated with seizure frequency.
  • Postsurgical HFO rates decreased in channels over the seizure focus, regardless of skull defect proximity.
  • HFO detection was not hindered by skull defects, with no significant changes in channels near the defect outside the focus.

Conclusions:

  • Skull defects do not interfere with postsurgical HFO detection using scalp EEG.
  • Scalp HFOs are a reliable biomarker for predicting postsurgical seizure freedom in pediatric focal lesional epilepsy.
  • HFO detection can aid in guiding therapeutic management for epilepsy patients.