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Effects of vagal nerve stimulation on laryngeal function
D S Lundy1, R R Casiano, H J Landy
1University of Miami School of Medicine, Department of Otolaryngology, FL 33101.
Journal of Voice : Official Journal of the Voice Foundation
|December 1, 1993
Summary
Functional electrical stimulation of the vagus nerve can control vocal fold movement for laryngeal disorders. This study explored its effects on the human larynx, showing potential for treating vocal fold paralysis and movement disorders.
Area of Science:
- Neurology
- Otolaryngology
- Biomedical Engineering
Background:
- Functional electrical stimulation (FES) shows promise for peripheral neuromuscular deficits.
- Applications in head and neck disorders, like vocal fold paralysis, are emerging.
- Limited understanding exists regarding FES mechanisms and long-term effects on laryngeal function.
Purpose of the Study:
- To investigate the effects of vagal nerve stimulation on normal human laryngeal function.
- To explore the potential of vagal nerve stimulation for treating laryngeal movement disorders.
Main Methods:
- Studied laryngeal and vocal function in five individuals with vagal nerve stimulator implants for intractable seizures.
- Assessed vocal fold movement at varying electrical stimulation frequencies (20 and 40 Hz).
Main Results:
- Consistent left vocal fold abduction/adduction was achieved at 20 and 40 Hz.
- Higher stimulation levels resulted in laryngeal hemispasm.
- Findings align with previous animal and human studies on recurrent laryngeal nerve stimulation.
Conclusions:
- The vagus nerve offers accessible electrode implantation for laryngeal muscle stimulation.
- Vagal nerve stimulation may be effective for treating laryngeal movement disorders.
- Further research is necessary to confirm efficacy and optimize treatment parameters.