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Abductor vocal cord spasm.

J E Aviv1, I Sanders, H F Biller

  • 1Department of Otolaryngology, Mount Sinai Medical Center, New York, NY 10029.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|March 1, 1990
PubMed
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This study introduces abductor vocal cord spasm, a new phenomenon. Lung inflation can cause either vocal cord abduction or adduction, depending on ventilation state.

Area of Science:

  • Laryngology
  • Respiratory Physiology
  • Animal Models

Background:

  • Vocal cord position is crucial for airway patency.
  • The effect of lung inflation on vocal cord position has been debated.
  • Understanding laryngeal muscle activity during respiratory maneuvers is essential.

Purpose of the Study:

  • To introduce and characterize abductor laryngospasm.
  • To resolve discrepancies regarding lung inflation's effect on vocal cord position.
  • To investigate the physiological mechanisms underlying vocal cord spasms.

Main Methods:

  • Induction of abductor laryngospasm in anesthetized dogs using CPAP after tracheal occlusion.
  • Electromyography (EMG) of posterior cricoarytenoid muscle (PCA) and laryngeal adductor muscles.

Related Experiment Videos

  • Induction of adductor laryngospasm via CPAP after hyperventilation.

    • Main Results:

    • Abductor laryngospasm characterized by sustained vocal cord abduction and PCA EMG activity.
    • Adductor laryngospasm characterized by vocal cord adduction and laryngeal adductor muscle EMG activity.
    • Lung inflation's effect on vocal cord position (abduction vs. adduction) is dependent on prior ventilation (hypoventilation vs. hyperventilation).

    Conclusions:

    • Abductor laryngospasm is the physiological converse of adductor laryngospasm.
    • Lung inflation's influence on vocal cord position is context-dependent.
    • This study clarifies the dynamic control of vocal cord position during respiratory challenges.