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Temporal Lobe Spikes Affect Distant Intrinsic Connectivity Networks.

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Interictal epileptiform discharges in temporal lobe epilepsy cause widespread brain signal changes, often outside the seizure focus. EEG-fMRI is valuable for assessing altered brain networks in surgical candidates.

Keywords:
BOLDEEGEEG-fMRITLEepilepsyfMRItemporal lobe

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Epilepsy Research

Background:

  • Drug-resistant temporal lobe epilepsy (TLE) poses challenges for surgical planning.
  • Understanding brain signal alterations during interictal epileptiform discharges (IED) is crucial for localizing the epileptogenic zone (EZ).
  • Electroencephalography-functional Magnetic Resonance Imaging (EEG-fMRI) is a tool to investigate brain activity changes associated with IEDs.

Purpose of the Study:

  • To evaluate local and distant blood oxygen level dependent (BOLD) signal changes related to IEDs in drug-resistant TLE.
  • To assess the concordance of BOLD signals with the presumed EZ.
  • To investigate the involvement of intrinsic connectivity networks (ICNs) in TLE patients.

Main Methods:

  • Thirty-three TLE patients underwent presurgical EEG-fMRI.
  • Single-subject analysis of BOLD signal changes correlated with IEDs.
  • Group analysis to identify common BOLD changes and ICN involvement.

Main Results:

  • IEDs elicited BOLD responses in 58% of patients at the single-subject level.
  • BOLD changes were often outside the temporal lobe and EZ (58% of cases).
  • Four ICNs (motor, visual, auditory/motor speech, default mode) were frequently involved; EEG-fMRI showed high specificity for ICN engagement.

Conclusions:

  • Interictal spikes in TLE affect distant extra-temporal areas, particularly motor/premotor cortex.
  • EEG-fMRI is recommended for TLE surgical candidates to investigate ICN alterations, not solely for localization.
  • Findings highlight the utility of EEG-fMRI in characterizing network disturbances in TLE.