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Upper esophageal sphincter function during deglutition.

P J Kahrilas1, W J Dodds, J Dent

  • 1Department of Medicine, Northwestern University Medical School, Chicago, Illinois.

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Summary
This summary is machine-generated.

Swallowing larger volumes increases upper esophageal sphincter (UES) opening and relaxation duration. UES function dynamics during swallowing depend on bolus volume for efficient deglutition.

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Area of Science:

  • Gastroenterology
  • Physiology
  • Swallowing Mechanics

Background:

  • The upper esophageal sphincter (UES) plays a critical role in preventing aspiration during swallowing.
  • Understanding UES dynamics in relation to bolus volume is essential for diagnosing and treating swallowing disorders.

Purpose of the Study:

  • To investigate the relationship between swallowed bolus volume and upper esophageal sphincter (UES) function.
  • To correlate manometric and videofluoroscopic findings of UES activity during swallowing.

Main Methods:

  • Simultaneous videofluoroscopy and manometry were performed in 8 healthy volunteers during swallows of graded volumes.
  • UES pressure, movement, and opening diameter were analyzed in relation to bolus volume.
  • Timing of UES relaxation and contraction was correlated with laryngeal elevation and pharyngeal contraction.

Main Results:

  • Maximal UES pressure was located 1.5 cm below the air-tissue interface, corresponding to the cricopharyngeus muscle.
  • UES high-pressure zone moved orally 2.0-2.5 cm during swallowing, with movement magnitude related to bolus volume.
  • UES opening diameter and relaxation duration increased significantly with larger bolus volumes, from 0.37s (dry swallow) to 0.65s (20ml swallow).

Conclusions:

  • UES dynamics during deglutition are volume-dependent.
  • Larger bolus volumes are accommodated by increased UES opening diameter and prolonged relaxation.
  • Increased UES relaxation duration is associated with prolonged laryngeal elevation and altered timing of UES contraction.