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Interictal brain activity changes in temporal lobe epilepsy: A quantitative electroencephalogram analysis.

Elena Fonseca1,2, Manuel Quintana1,2, Iván Seijo-Raposo1,2

  • 1Epilepsy Unit, Neurology Department, Vall d'Hebron University Hospital, Barcelona, Spain.

Acta Neurologica Scandinavica
|October 23, 2021
PubMed
Summary

Quantitative electroencephalography (qEEG) shows promise in diagnosing temporal lobe epilepsy (TLE). Lower alpha-delta and alpha-theta ratios may identify TLE patients, while higher contralateral theta power may indicate longer disease duration.

Keywords:
brain waveselectroencephalographyseizurestemporal lobe epilepsy

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Area of Science:

  • Neurology
  • Neurophysiology
  • Epileptology

Background:

  • Temporal lobe epilepsy (TLE) is a common neurological disorder.
  • Accurate diagnosis and understanding disease progression are crucial for patient management.
  • Quantitative electroencephalography (qEEG) offers a method for objective analysis of brain activity.

Purpose of the Study:

  • To assess the utility of qEEG in analyzing baseline activity in TLE patients.
  • To identify qEEG measures correlated with epilepsy duration and drug resistance.

Main Methods:

  • Cross-sectional study comparing 39 TLE patients and 23 controls.
  • Analysis of artifact-free resting-state EEG using Fast Fourier Transform (FFT).
  • Calculation of FFT power ratios, including alpha-delta and alpha-theta ratios.

Main Results:

  • TLE patients exhibited lower ipsilateral alpha-delta and alpha-theta ratios.
  • Higher contralateral theta power ratios correlated with longer epilepsy duration.
  • No qEEG measures were found to predict drug resistance.

Conclusions:

  • Baseline qEEG analysis can aid in TLE diagnosis and provide insights into disease duration.
  • Reduced alpha-delta and alpha-theta ratios are potential biomarkers for TLE.
  • Elevated contralateral theta power may signify a longer history of epilepsy.