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Stereo-EEG propagating source reconstruction identifies new surgical targets for epilepsy patients.

Publication ,  Journal Article
Thio, BJ; Sinha, N; Davis, KA; Sinha, SR; Grill, WM
Published in: Brain : a journal of neurology
March 2025

Epilepsy surgery can eliminate seizures in patients with drug-resistant focal epilepsy. Surgical intervention requires proper identification of the epileptic network and often involves implanting stereo-EEG electrodes in patients where non-invasive methods are insufficient. However, only ∼60% of patients achieve seizure-freedom following surgery. Quantitative methods have been developed to help improve surgical outcomes. However, previous quantitative methods that localized interictal spike and seizure activity using stereo-EEG recordings did not account for the propagation path encoded by the temporal dynamics of stereo-EEG recordings. Reconstructing the seizure propagation path can aid in determining whether a signal originated from the seizure onset or propagation zone, which directly informs treatment decisions. We developed a novel source reconstruction algorithm, Temporally Dependent Iterative Expansion (TEDIE), that accurately reconstructs propagating and expanding neural sources over time. TEDIE iteratively optimizes the number, location and size of neural sources to minimize the differences between the reconstructed and recorded stereo-EEG signals using temporal information to refine the reconstructions. The TEDIE output comprises a movie of seizure activity projected onto patient-specific brain anatomy. We analysed data from 46 epilepsy patients implanted with stereo-EEG electrodes at Duke Hospital (12 patients) and the Hospital of the University of Pennsylvania (34 patients). We reconstructed seizure recordings and found that TEDIE's seizure onset zone reconstructions were closer to the resected brain region for Engel 1 compared to Engel 2-4 patients, retrospectively validating the clinical utility of TEDIE. We also demonstrated that TEDIE has prospective clinical value, whereby metrics that can be determined presurgically accurately predict whether a patient would achieve seizure-freedom following surgery. Furthermore, we used TEDIE to delineate new potential surgical targets in 12/23 patients who are currently Engel 2-4. We validated TEDIE by accurately reconstructing various dynamic synthetic neural sources with known locations and sizes. TEDIE generated more accurate, focal and interpretable dynamic reconstructions of seizures compared to other algorithms (sLORETA and IRES). Our findings demonstrate that TEDIE is a promising clinical tool that can greatly improve epileptogenic zone localization and epilepsy surgery outcomes.

Duke Scholars

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Published In

Brain : a journal of neurology

DOI

EISSN

1460-2156

ISSN

0006-8950

Publication Date

March 2025

Volume

148

Issue

3

Start / End Page

764 / 775

Related Subject Headings

  • Young Adult
  • Seizures
  • Neurology & Neurosurgery
  • Middle Aged
  • Male
  • Humans
  • Female
  • Epilepsy
  • Electroencephalography
  • Electrodes, Implanted
 

Citation

APA
Chicago
ICMJE
MLA
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Thio, B. J., Sinha, N., Davis, K. A., Sinha, S. R., & Grill, W. M. (2025). Stereo-EEG propagating source reconstruction identifies new surgical targets for epilepsy patients. Brain : A Journal of Neurology, 148(3), 764–775. https://doi.org/10.1093/brain/awae297
Thio, Brandon J., Nishant Sinha, Kathryn A. Davis, Saurabh R. Sinha, and Warren M. Grill. “Stereo-EEG propagating source reconstruction identifies new surgical targets for epilepsy patients.Brain : A Journal of Neurology 148, no. 3 (March 2025): 764–75. https://doi.org/10.1093/brain/awae297.
Thio BJ, Sinha N, Davis KA, Sinha SR, Grill WM. Stereo-EEG propagating source reconstruction identifies new surgical targets for epilepsy patients. Brain : a journal of neurology. 2025 Mar;148(3):764–75.
Thio, Brandon J., et al. “Stereo-EEG propagating source reconstruction identifies new surgical targets for epilepsy patients.Brain : A Journal of Neurology, vol. 148, no. 3, Mar. 2025, pp. 764–75. Epmc, doi:10.1093/brain/awae297.
Thio BJ, Sinha N, Davis KA, Sinha SR, Grill WM. Stereo-EEG propagating source reconstruction identifies new surgical targets for epilepsy patients. Brain : a journal of neurology. 2025 Mar;148(3):764–775.
Journal cover image

Published In

Brain : a journal of neurology

DOI

EISSN

1460-2156

ISSN

0006-8950

Publication Date

March 2025

Volume

148

Issue

3

Start / End Page

764 / 775

Related Subject Headings

  • Young Adult
  • Seizures
  • Neurology & Neurosurgery
  • Middle Aged
  • Male
  • Humans
  • Female
  • Epilepsy
  • Electroencephalography
  • Electrodes, Implanted