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Updated: Jun 13, 2025

Network Analysis of Foramen Ovale Electrode Recordings in Drug-resistant Temporal Lobe Epilepsy Patients
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Quantifying Vagus Nerve Stimulation Outcomes in Multifocal Refractory Epilepsy: A Model Across Multiple Surgeries.

Rida Zakar1, John-Victor El Khoury1, Gilles Prince1

  • 1Medicine, Université Saint-Joseph, Beirut, LBN.

Cureus
|September 16, 2024
PubMed
Summary

A new model quantifies vagus nerve stimulation (VNS) effectiveness for refractory epilepsy. This approach shows reduced seizure severity and improved quality of life in adult and pediatric patients after VNS surgery.

Keywords:
clinician-measured outcomesmultifocal epilepsyneuromodulationrefractory epilepsyseverity scoringvagus nerve stimulation

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Area of Science:

  • Neurology
  • Medical Devices
  • Clinical Research

Background:

  • Multifocal refractory epilepsy presents significant challenges, especially in patients with multiple prior surgeries.
  • Vagus nerve stimulation (VNS) is a treatment option, but its outcomes require robust, patient-centered evaluation.
  • Existing assessment methods may not fully capture the complex benefits of VNS across diverse patient populations.

Purpose of the Study:

  • To develop a quantifiable model for assessing Vagus Nerve Stimulation (VNS) outcomes in multifocal refractory epilepsy.
  • To provide a patient-centered framework evaluating VNS efficacy in adults, pediatric patients, and those with cognitive/communicative impairments.
  • To validate the model by assessing changes in seizure frequency, quality of life, and hospitalizations.

Main Methods:

  • Retrospective analysis of 49 patients with multifocal refractory epilepsy undergoing VNS surgery.
  • Stratification of patients into adult (≥16 years) and pediatric/cognitively impaired groups.
  • Utilized Liverpool Seizure Severity Scale (LSSS) for adults and Hague Seizure Severity Scale (HASS) for pediatric/impaired groups; compared with Engel Outcome Scale (EOS).

Main Results:

  • Significant reduction in seizure severity observed across both adult and pediatric/impaired groups post-VNS.
  • Quantifiable improvements in seizure frequency and quality of life metrics noted with successive surgeries.
  • The developed model effectively captured VNS outcomes with minimal reported major side effects.

Conclusions:

  • A novel, quantifiable model for evaluating VNS outcomes in refractory epilepsy has been established.
  • The model offers a comprehensive tool for clinicians to assess VNS effectiveness in diverse patient populations.
  • This framework enhances understanding of VNS therapy's impact, supporting informed clinical decision-making.