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A pressure-regulated model of normal and pathologic phonation

S Nasri1, A Namazie, J Kreiman

  • 1Division of Head and Neck Surgery, University of California, Los Angeles School of Medicine 90024-1624.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|December 1, 1994
PubMed
Summary

This study developed a canine model simulating constant subglottic pressure during phonation. Findings reveal vocal efficiency depends on pressure-resistance matching, crucial for understanding laryngeal function.

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Area of Science:

  • Laryngology
  • Respiratory Physiology
  • Bioacoustics

Background:

  • The lung-thorax system is theorized to be a constant pressure source during phonation.
  • Previous animal models inaccurately used constant flow sources, not reflecting physiological conditions.

Purpose of the Study:

  • To develop and validate an in vivo canine model simulating a constant subglottic pressure source during phonation.
  • To investigate the relationship between subglottic pressure, glottal resistance, and vocal efficiency under different laryngeal conditions.

Main Methods:

  • An in vivo canine model was established to maintain constant subglottic pressure during phonation.
  • Recurrent laryngeal nerve (RLN) and superior laryngeal nerve (SLN) stimulation were used to alter glottal resistance.
  • Vocal efficiency was measured under normal, unilateral RLN paralysis, and post-arytenoid adduction conditions.

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Main Results:

  • Increasing RLN stimulation significantly increased glottal resistance, while SLN stimulation had no significant effect.
  • Normal canines exhibited maximal vocal efficiency, indicating optimal pressure-resistance matching.
  • Unilateral RLN paralysis resulted in significantly lower vocal efficiency due to pressure-resistance mismatch.
  • Arytenoid adduction improved vocal efficiency and reduced mismatch in the paralyzed state.

Conclusions:

  • The developed canine model accurately simulates constant subglottic pressure during phonation.
  • Vocal efficiency is critically dependent on the match between pulmonary pressure and laryngeal resistance.
  • These findings offer insights into normal and pathological laryngeal biomechanics and vocal production.