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Related Experiment Videos

Normal erect swallowing. Normal function and incidence of variations.

D J Curtis, D F Cruess, A H Dachman

    Investigative Radiology
    |October 1, 1985
    PubMed
    Summary

    This study details normal pharyngeal swallowing mechanics in asymptomatic volunteers. New findings clarify bolus transit, epiglottic inversion, and laryngeal closure during swallowing.

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    Area of Science:

    • Gastroenterology
    • Physiology
    • Radiology

    Background:

    • Previous studies on pharyngeal swallowing utilized high-radiation cine recordings.
    • Understanding normal swallowing mechanics is crucial for diagnosing dysphagia.

    Purpose of the Study:

    • To detail the normal pharyngeal swallowing process in asymptomatic individuals.
    • To identify new observations in pharyngeal swallowing mechanics using advanced videorecording.

    Main Methods:

    • Frame-by-frame analysis of videorecorded pharyngeal swallows.
    • Selection of 16 asymptomatic normal volunteers from 871 candidates based on rigorous criteria.

    Main Results:

    • Confirmed previous observations on pharyngeal swallows with lower radiation dosage.

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  • New findings include nasopharyngeal occlusion timing, air mixing in open swallows, consistent epiglottic inversion, laryngeal descent aiding bolus clearance, potential incomplete vestibular closure, peristaltic wave initiation timing, frequent cricopharyngeus visualization without delay, and common asymmetric bolus flow.
  • Epiglottic inversion and laryngeal closure were observed regardless of swallow type.

    • Conclusions:

    • Videorecorded pharyngeal swallow analysis provides detailed insights into normal swallowing mechanics.
    • Normal pharyngeal swallowing exhibits specific characteristics, including consistent epiglottic inversion and potential for incomplete laryngeal closure without compromising airway protection.