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Related Experiment Videos

Timing of glottic closure during normal swallow

Y Ohmae1, J A Logemann, P Kaiser

  • 1National Defense Medical College, Department of Otolaryngology, Saitama, Japan.

Head & Neck
|September 1, 1995
PubMed
Summary

Glottic closure patterns during normal swallowing are variable. True vocal cord closure timing depends on laryngeal elevation and bolus volume, not just initial arytenoid movements.

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Area of Science:

  • Otolaryngology
  • Swallowing Physiology
  • Speech-Language Pathology

Background:

  • Understanding the biomechanics of normal swallowing is crucial for diagnosing and treating dysphagia.
  • Glottic closure is a key protective mechanism during the swallow.
  • Previous research has not fully elucidated the precise temporal dynamics of glottic closure.

Purpose of the Study:

  • To investigate the temporal characteristics and patterns of glottic closure during normal swallowing.
  • To concurrently analyze videofluoroscopy and videoendoscopy data for detailed insights.

Main Methods:

  • Eight healthy volunteers underwent concurrent videofluoroscopy and videoendoscopy.
  • Swallowing of four different bolus types was analyzed.
  • Endoscopic views were captured from the uvula and laryngeal vestibule levels.

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  • Temporal relationships between laryngeal behaviors and oropharyngeal events were assessed.

    • Main Results:

    • Arytenoid adduction and contact initiated swallowing but showed high temporal variability.
    • True vocal cord (TVC) closure primarily occurred post-laryngeal elevation onset.
    • Bolus volume significantly influenced the timing of TVC closure.

    Conclusions:

    • Arytenoid closure does not guarantee complete true vocal cord (TVC) closure during swallowing.
    • Complete TVC closure may occur during laryngeal elevation and arytenoid tilting phases.
    • Swallowing physiology involves complex, coordinated laryngeal and pharyngeal movements.