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Related Experiment Videos

Pharyngeal pump and esophageal transit.

A G Buthpitiya1, D Stroud, C O Russell

  • 1Department of Surgery, Prince Henry's Hospital, Melbourne, Australia.

Digestive Diseases and Sciences
|November 1, 1987
PubMed
Summary

The pharyngeal pump injects food boluses into the esophagus. More viscous boluses move slower, requiring esophageal peristalsis for propulsion, unlike less viscous liquids like water.

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Area of Science:

  • Physiology
  • Gastroenterology
  • Biomechanics

Background:

  • Deglutition involves complex coordination between the pharynx and esophagus.
  • The pharynx's role as a pump in propelling food boluses is under investigation.
  • Understanding bolus transport dynamics is crucial for diagnosing swallowing disorders.

Purpose of the Study:

  • To investigate the role of the pharyngeal pump in deglutition.
  • To measure the velocity profile of radionuclide boluses of varying viscosity.
  • To determine the contribution of pharyngeal propulsion versus esophageal peristalsis in bolus transport.

Main Methods:

  • Development of a novel method to measure radionuclide bolus velocity.
  • Application of the method to water and treacle boluses in nine healthy volunteers.
  • Analysis of bolus velocity and extent of esophageal propulsion.

Main Results:

  • More viscous treacle boluses had slower initial pharyngeal injection velocities (152 mm/sec) compared to water (236 mm/sec).
  • Treacle boluses were propelled only through the proximal esophagus, requiring peristalsis for distal transport.
  • Water boluses were propelled further, reaching the gastroesophageal junction with minimal need for peristaltic assistance.

Conclusions:

  • The pharyngeal pump plays a significant role in initiating bolus transport during deglutition.
  • Pharyngeal propulsion is the primary mechanism for non-viscous liquid ingestion.
  • Esophageal peristalsis is essential for propelling viscous substances and clearing residual bolus.

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