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Related Experiment Videos

Correlation between stroboscopy and electromyography in laryngeal paralysis

J Kokesh1, P W Flint, L R Robinson

  • 1Department of Otolaryngology-Head and Neck Surgery, University of Washington, Seattle.

The Annals of Otology, Rhinology, and Laryngology
|November 1, 1993
PubMed
Summary

Vocal fold motion impairment can present with mucosal waves even with nerve damage. Surgical intervention can restore vocal fold mucosal waves, suggesting tension and pressure are key factors, not just nerve status.

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Area of Science:

  • Otolaryngology
  • Neurology
  • Speech-Language Pathology

Background:

  • Vocal fold motion impairment affects phonation and airway.
  • Electromyography (EMG) and stroboscopy are diagnostic tools for vocal fold dysfunction.
  • The relationship between vocal fold innervation status and vibratory function (mucosal wave) requires clarification.

Purpose of the Study:

  • To correlate electromyography (EMG) findings with stroboscopic examination in patients with vocal fold motion impairment.
  • To investigate the factors influencing the presence of the mucosal wave in immobile vocal folds.
  • To assess the impact of surgical intervention on mucosal wave development.

Main Methods:

  • Retrospective review of 20 patients with vocal fold motion impairment.

Related Experiment Videos

  • Analysis of EMG studies to determine vocal fold innervation status (denervation, reinnervation, partial denervation).
  • Stroboscopic examination to assess the presence or absence of the mucosal wave before and after treatment.

    • Main Results:

    • Mucosal waves were observed in 8/10 patients with EMG evidence of reinnervation or partial denervation.
    • Mucosal waves were present in 3/10 patients with EMG evidence of denervation.
    • Six patients developed mucosal waves post-surgical medialization despite EMG-confirmed denervation.

    Conclusions:

    • The presence of a mucosal wave in vocal fold motion impairment may not solely depend on the status of vocal fold innervation.
    • Vocal fold tension and subglottic pressure appear to be critical determinants of mucosal wave presence.
    • Surgical medialization can facilitate the development of mucosal waves even in the presence of denervation.