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Related Experiment Videos

Experiments in laryngeal reinnervation

R L Crumley

    The Laryngoscope
    |September 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    The split phrenic nerve graft shows promise for laryngeal reinnervation, potentially restoring vocal cord function. The ansa hypoglossi neuromuscular pedicle procedure was ineffective for restoring vocal cord abduction.

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    Area of Science:

    • Veterinary Surgery
    • Laryngeal Physiology
    • Nerve Regeneration

    Background:

    • Vocal cord paralysis affects airway patency and phonation.
    • Effective surgical reinnervation strategies are crucial for restoring laryngeal function.
    • Previous attempts at laryngeal reinnervation have yielded variable results.

    Purpose of the Study:

    • To evaluate the efficacy of two surgical procedures for laryngeal reinnervation in dogs.
    • To determine if the ansa hypoglossi neuromuscular pedicle or split phrenic nerve graft can restore inspiratory vocal cord abduction.
    • To elucidate the mechanisms underlying successful reinnervation.

    Main Methods:

    • Surgical implantation of ansa hypoglossi neuromuscular pedicle (5 dogs) or split phrenic nerve graft (14 dogs) to the recurrent laryngeal nerve.

    Related Experiment Videos

  • Assessment of vocal cord abduction during respiration using endoscopic visualization.
  • Electrophysiological studies (electromyography, nerve action potentials) and histological analysis to confirm reinnervation.
  • Functional tests including superior laryngeal nerve transection and muscle detachment.

    • Main Results:

    • The ansa hypoglossi neuromuscular pedicle procedure did not result in functional reinnervation or inspiratory vocal cord abduction.
    • The split phrenic nerve graft procedure led to inspiratory vocal cord abduction in 5 dogs and quiet respiration abduction in 2 dogs.
    • Electrophysiological and histological findings confirmed posterior cricoarytenoid muscle reinnervation via the phrenic nerve graft.
    • Reinnervation success was dependent on the integrity of the nerve graft and absence of recurrent laryngeal nerve regeneration.

    Conclusions:

    • The ansa hypoglossi neuromuscular pedicle is not a viable method for posterior cricoarytenoid muscle reinnervation.
    • The split phrenic nerve graft can achieve functional reinnervation of the posterior cricoarytenoid muscle, restoring vocal cord abduction.
    • Factors such as recurrent laryngeal nerve regeneration and graft avulsion can impede successful phrenic nerve grafting for laryngeal reinnervation.