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Implantation Surgery for Abdominal Vagus Nerve Stimulation and Recording Studies in Awake Rats
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Longer-term effects of implanted vagal nerve stimulation.

Markad V Kamath1, Mary S Thomson, Sneha Gaitonde

  • 1Departments of Medicine, Health Sciences Centre, McMaster University, Hamilton, Ontario, Canada. kamathm@mcmaster.ca

Journal of Long-Term Effects of Medical Implants
|March 15, 2011
PubMed
Summary

Vagal nerve stimulation (VNS) offers a non-drug treatment for neuropsychiatric disorders, showing brain changes and benefits for patients unresponsive to traditional therapies.

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Area of Science:

  • Neuroscience
  • Neurology
  • Psychiatry

Background:

  • Vagal nerve stimulation (VNS) is an established non-pharmacologic therapy for neuropsychiatric disorders in adults and children.
  • Extensive research over two decades confirms VNS induces both immediate and sustained alterations in key brain regions.

Purpose of the Study:

  • To review the long-term effects of implanted VNS.
  • To evaluate VNS as a therapeutic option for patients with limited treatment responses or intolerance to conventional therapies.
  • To assess the safety, efficacy, tolerability, and patient acceptance of VNS.

Main Methods:

  • Systematic review of studies on longer-term implanted VNS.
  • Analysis of neuroimaging data demonstrating VNS-induced brain changes.
  • Evaluation of clinical outcomes, safety profiles, and patient-reported data.

Main Results:

  • VNS modulates activity in brain areas including the thalamus, cerebellum, orbitofrontal cortex, limbic system, hypothalamus, and medulla.
  • Longer-term VNS demonstrates therapeutic benefits for patients refractory to or intolerant of standard treatments.
  • The modality is generally safe and well-tolerated, with good patient acceptance and adherence.

Conclusions:

  • Longer-term implanted VNS is a viable therapeutic strategy for neuropsychiatric disorders.
  • It provides a valuable non-pharmacologic option for patient populations with unmet treatment needs.
  • VNS shows a favorable profile regarding efficacy, safety, and tolerability in both pediatric and adult populations.