EEG-based connectivity in patients with partial seizures with and without generalization

Johanna Dömötör, B. Clemens, M. Emri, Szilvia Puskás, I. Fekete

Research output: Article

Abstract

Background and purpose: To investigate the neurophysiological basis of secondary generalization of partial epileptic seizures. Methods: Inter-ictal, resting-state EEG functional connectivity (EEGfC) was evaluated and compared: patients with exclusively simple partial seizures (sp group) were compared to patients with simple partial and secondary generalized seizures (spsg group); patients with exclusively complex partial seizures (cp group) were compared to patients with cp and secondary generalized seizures (cpsg group); the collapsed sp+cp group (spcp) was compared to those who had exclusively secondary generalized seizures (sg group). EEGfC was computed from 21-channel waking EEG. 3 minutes of waking EEG background activity was analyzed by the LORETA Source Correlation (LSC) software. Current source density time series were computed for 23 pre-defined cortical regions (ROI) in each hemisphere, for the 1-25 Hz very narrow bands (1 Hz bandwidth). Thereafter Pearson correlation coefficients were calculated between all pairs of ROI time series in the same hemisphere. Z-scored correlation coefficients were compared at the group level (t-tests and correction for multiple comparisons by local false discovery rate, FDR). Results: Statistically significant (corrected p<0.05) EEGfC differences emerged at specific frequencies (spsg > sg; cpsg > cp), and at many frequencies (sg > spcp). The findings indicated increased coupling between motor cortices and several non-motor areas in patients with partial and sg seizures as compared to patients with partial seizures and no sg seizures. Further findings suggested increased coupling between medial parietal-occipital areas (structural core of the cortex) and lateral hemispheric areas. Conclusion: Increased inter-ictal EEGfC is associated with habitual occurrence of secondary generalized seizures.

Original languageEnglish
Pages (from-to)99-109
Number of pages11
JournalIdeggyogyaszati szemle
Volume72
Issue number3-4
DOIs
Publication statusPublished - márc. 30 2019

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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