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Related Experiment Videos

Interaction between steady flow and individualised compliant segments: application to upper airways

R Fodil1, C Ribreau, B Louis

  • 1Unité de Physiologie Respiratoire, INSERM U296, Faculté de Médecine, Créteil, France.

Medical & Biological Engineering & Computing
|April 16, 1998
PubMed
Summary

This study models upper airway obstruction in sleep apnea syndrome using a two-element pharyngeal model. The model reveals complex flow behaviors, including a physiological

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Area of Science:

  • Biomechanics
  • Fluid Dynamics
  • Sleep Medicine

Background:

  • Upper airway obstruction is a key feature of sleep apnea syndrome.
  • Understanding pharyngeal mechanics is crucial for explaining airway collapse during sleep.

Purpose of the Study:

  • To model local pharyngeal obstruction in sleep apnea.
  • To investigate the mechanical behavior of a two-element compliant airway model.

Main Methods:

  • Developed a two-element model of the pharynx with individual compliance.
  • Analyzed steady-state solutions for non-viscous and viscous fluid flow.
  • Used transmural pressure as the controlled variable to predict flow and area variations.

Main Results:

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  • The model exhibits complex mechanical behaviors, including critical conditions.
  • Viscous fluid flow shows a doubly folded area evolution and a physiological 'flow plateau'.
  • Behaviors resemble the 'choking' phenomenon in elastic tubes.

    • Conclusions:

    • A two-element model captures rich mechanical behaviors of pharyngeal obstruction.
    • Interaction within compliant structures with singularities is critical for understanding flow dynamics.
    • This model provides insights into the mechanisms of upper airway obstruction in sleep apnea.