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Related Experiment Videos

Structural displacements in normal swallowing: a videofluoroscopic study.

R J Leonard1, K A Kendall, S McKenzie

  • 1Department of Otolaryngology/Head and Neck Surgery, University of California at Davis Medical School/Center, Sacramento, California 95817, USA.

Dysphagia
|June 6, 2000
PubMed
Summary

This study establishes normal swallowing data for upper airway structures in adults. Larger liquid volumes increase hyoid bone displacement and pharyngeal constriction, impacting swallowing dynamics.

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Area of Science:

  • Anatomy and Physiology
  • Swallowing Biomechanics
  • Deglutition Studies

Background:

  • Understanding normal swallowing mechanics is crucial for diagnosing dysphagia.
  • Normative data for upper aerodigestive tract structure displacement during deglutition is limited.
  • Previous research has not extensively detailed pharyngeal constriction or larynx-to-hyoid approximation dynamics.

Purpose of the Study:

  • To establish normative data for upper aerodigestive tract structure displacement during swallowing.
  • To investigate the relationship between bolus volume and structural movements.
  • To identify sex-based differences in swallowing kinematics.

Main Methods:

  • Dynamic videofluoroscopic swallow studies were conducted on 60 healthy adult volunteers.

Related Experiment Videos

  • Measurements included hyoid bone displacement, larynx-to-hyoid approximation, pharyngeal constriction, and pharyngoesophageal sphincter (PES) opening.
  • Liquid boluses of 1, 3, and 20 cc were used to assess deglutition.

    • Main Results:

    • Bolus size directly correlated with hyoid displacement, PES opening, and pharyngeal constriction.
    • Hyoid-to-larynx approximation remained consistent across different bolus volumes.
    • Significant sex differences were observed in most measured variables, excluding PES opening.

    Conclusions:

    • This study provides valuable normative data for key upper aerodigestive tract structures during swallowing.
    • Bolus volume is a significant factor influencing swallowing kinematics.
    • The findings contribute to a better understanding of normal deglutition and can aid in the assessment of swallowing disorders.