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Minimally Invasive Murine Laryngoscopy for Close-Up Imaging of Laryngeal Motion During Breathing and Swallowing
Published on: December 1, 2023
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Isolated pharyngeal swallow exists during normal human feeding.
Hitoshi Kagaya1, Michio Yokoyama, Eiichi Saitoh
1Department of Rehabilitation Medicine I, School of Medicine, Fujita Health University.
The Tohoku Journal of Experimental Medicine
|May 8, 2015
Summary
Isolated pharyngeal swallows (IPS) occur during normal eating, particularly with mixed foods. These swallows, without prior oral transport, may serve as an airway protective mechanism, highlighting swallowing complexity.
Area of Science:
- Physiology
- Gastroenterology
- Speech and Hearing Science
Background:
- The pharynx serves dual roles as an airway and food passage.
- Pharyngeal swallowing typically follows oral bolus transport.
- Experimental induction of pharyngeal swallows without oral stages is possible.
Purpose of the Study:
- To investigate the occurrence of pharyngeal swallows without preceding bolus transport during normal human feeding.
- To determine if isolated pharyngeal swallows (IPS) occur in everyday eating scenarios.
Main Methods:
- Videofluoroscopic examination of swallowing in 53 healthy volunteers (25-89 years).
- Three swallowing conditions: liquid barium, solid food, and mixed food.
- Classification of swallows into consecutive pharyngeal swallows (CPS) and isolated pharyngeal swallows (IPS).
Main Results:
- Out of 681 identified swallows, 43 were classified as IPS.
- IPS occurred exclusively as the first swallow of a trial.
- IPS were more frequent with mixed food compared to liquid, and did not differ by age group.
Conclusions:
- Isolated pharyngeal swallows (IPS) occur during normal, daily eating.
- IPS may function as an airway protective mechanism.
- Swallowing is a more complex process than a simple reflex.
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