Long-term Efficacy and Predictors of Vagus Nerve Stimulation in Drug-Resistant Epilepsy

Strategic Insights -

Researchers from Capital Medical University in Beijing, China have made significant findings in the field of epilepsy treatment, specifically regarding the long-term effectiveness and predictors of vagus nerve stimulation (VNS) in drug-resistant epilepsy (DRE) patients. A study published in Acta Epileptologica revealed that VNS effectively controls seizures, with effectiveness and seizure-free rates improving over time. The research analyzed 162 DRE patients with VNS, followed for over a year post-surgery, and identified structural etiology as a predictive factor for effective VNS treatment.

Key Takeaways:

  • The study followed 162 DRE patients with VNS for over a year post-surgery, with 99 patients followed for over 12 months, 80 for over 24 months, and 70 for over 36 months.
  • At 12 months, 33 (33.4%) showed effectiveness, including 7 (7.1%) who were seizure-free. At 24 months, 32 (40.0%) were effective, including 12 (15.0%) who were seizure-free.
  • At 36 months, 36 (51.4%) were effective, including 11 (15.7%) who were seizure-free. After 5 years, 27 (55.1%) were effective, including 8 (16.3%) who were seizure-free.
  • Multivariate regression analysis identified structural etiology as a predictive factor for effective VNS treatment (P = 0.039, OR = 0.35 [0.13-0.95]).
  • The study concluded that patients with structural factors are at higher risk of ineffective VNS, suggesting epilepsy etiology may predict VNS outcomes.

Statistics:

  • 162 DRE patients were monitored for over a year post-surgery.
  • At 12 months, 33.4% of patients showed effectiveness, including 7.1% who were seizure-free.
  • At 24 months, 40.0% of patients were effective, including 15.0% who were seizure-free.
  • At 36 months, 51.4% of patients were effective, including 15.7% who were seizure-free.
  • After 5 years, 55.1% of patients were effective, including 16.3% who were seizure-free.
  • Multivariate regression analysis identified structural etiology as a predictive factor for effective VNS treatment with a P-value of 0.039 and an odds ratio of 0.35 (95% CI: 0.13-0.95).

Sources:

  • Long-term efficacy and predictors of vagus nerve stimulation in drug-resistant epilepsy: a multicenter cohort study. Acta Epileptologica, 2025;7(1):40.
  • Researchers from Capital Medical University Report Details of New Studies and Findings in the Area of Epilepsy (Long-term efficacy and predictors of vagus nerve stimulation in drug-resistant epilepsy: a multicenter cohort study). Medical Devices & Surgical Technology Week. September 21, 2025; p 2926.