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Diffusion tractography predicts propagated high-frequency activity during epileptic spasms.

Nolan B O'Hara1,2, Min-Hee Lee2,3, Csaba Juhász1,2,3,4

  • 1Translational Neuroscience Program, Wayne State University, Detroit, Michigan, USA.

Epilepsia
|April 7, 2022
PubMed
Summary

Structural brain networks, specifically corticocortical pathways, influence how epileptic spasms spread. Faster spread in these networks correlates with less successful epilepsy surgery outcomes.

Keywords:
diffusion MRI tractographyhigh-frequency oscillationsinfantile spasmsintracranial electroencephalographyseizure propagationsurgical outcome

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Area of Science:

  • Neuroscience
  • Epileptology
  • Medical Imaging

Background:

  • Epileptic spasms are characterized by abnormal brain activity.
  • Understanding the propagation of ictal oscillations is crucial for epilepsy surgery.
  • Current knowledge on the structural basis of ictal propagation is limited.

Purpose of the Study:

  • To identify structural networks constraining ictal oscillation propagation in epileptic spasms.
  • To compare propagation patterns in patients with successful versus unsuccessful surgical outcomes.

Main Methods:

  • Analysis of subdural electrode recordings in 18 young patients (1-11 years) during epileptic spasms.
  • Generation of structural networks using diffusion MRI tractography.
  • Correlation of network properties with ictal oscillation onset latency and amplitude.

Main Results:

  • Ictal oscillation onset latency strongly correlated with the length of direct corticocortical tracts (p < .001).
  • Faster ictal oscillation propagation within corticocortical networks predicted seizure recurrence post-surgery (p = .039).
  • Ictal oscillation amplitude associated with tractography length and fractional anisotropy (FA) (p = .002/.030).

Conclusions:

  • Spatiotemporal propagation of epileptic spasm activity aligns with corticocortical pathway characteristics.
  • Individualized analysis of these pathways may aid surgical decision-making and outcome prediction.