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Laboratory Administration of Transcutaneous Auricular Vagus Nerve Stimulation taVNS: Technique, Targeting, and Considerations
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Stimulation parameters for directional vagus nerve stimulation.

Joel Villalobos1,2, Sophie C Payne1,2, Glenn M Ward1,3,4

  • 1Bionics Institute, East Melbourne, Vic, Australia.

Bioelectronic Medicine
|July 18, 2023
PubMed
Summary
This summary is machine-generated.

High-frequency stimulation effectively blocks nerve signals in the vagus nerve, a key step for developing new treatments for type 2 diabetes using efferent vagus nerve stimulation (eVNS). This research optimizes parameters for precise nerve blocking.

Keywords:
Bioelectric medicineMedical devicesMetabolic diseaseNerve blockingPeripheral nerve stimulation

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Endocrinology

Background:

  • Autonomic nerve stimulation is an emerging therapy for various diseases.
  • Efferent vagus nerve stimulation (eVNS) shows promise for lowering glucose levels in type 2 diabetes models.
  • This study refines eVNS by optimizing nerve-blocking parameters for clinical application.

Purpose of the Study:

  • To investigate the impact of stimulation parameters on blocking afferent nerve activation.
  • To establish an effective and focal nerve-blocking strategy for vagus nerve stimulation.
  • To determine parameters compatible with clinical implantable pulse generators.

Main Methods:

  • Utilized a rat model with anterior abdominal vagus nerve implantation.
  • Recorded evoked compound action potentials (ECAPs) to assess nerve block efficacy.
  • Varied blocking frequency, duty cycle, and current amplitude while measuring ECAP threshold and saturation.

Main Results:

  • Lower blocking frequencies (≤ 4 kHz) and higher duty cycles (> 70%) increased ECAP threshold and decreased saturation.
  • Charge delivered per pulse significantly influenced block magnitude at specific frequencies and duty cycles.
  • The nerve block was found to be focal, with a range of < 2 mm.

Conclusions:

  • Identified optimal frequencies, duty cycles, and currents for efficacious, focal axonal block in C-fiber tracts.
  • These findings support the development of eVNS for type 2 diabetes treatment.
  • The established parameters are suitable for use with commercially available clinical devices.