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Laryngeal brain stem evoked response.

C K Anonsen1, M L Lalakea, M Hannley

  • 1Department of Otolaryngology, Stanford University Medical Center, California.

The Annals of Otology, Rhinology, and Laryngology
|September 1, 1989
PubMed
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This study demonstrates that brain stem recordings accurately measure laryngeal reflexes in cats. These findings validate brain stem auditory evoked potentials as a tool for studying laryngeal nerve activity.

Area of Science:

  • Neuroscience
  • Otolaryngology
  • Physiology

Background:

  • Laryngeal reflexes, mediated by the brain stem, are crucial for airway protection.
  • Aberrant laryngeal reflexes are implicated in unexplained disorders like reflex apnea and sudden infant death syndrome.

Purpose of the Study:

  • To determine if far-field brain stem recordings can reliably measure laryngeal activity.
  • To validate brain stem evoked potentials as a tool for assessing laryngeal reflexes.

Main Methods:

  • Electrical stimulation of the superior laryngeal nerve in adult cats.
  • Recording of laryngeal adductor reflex and far-field brain stem activity.
  • Analysis of reproducible positive and negative brain stem waves, response thresholds, and latencies.

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Main Results:

  • Six reproducible positive and five reproducible negative brain stem waves were identified.
  • Wave latencies closely matched previously reported findings in near and far-field studies.
  • Response thresholds and latencies were evaluated based on stimulus parameters.

Conclusions:

  • Far-field brain stem recordings provide a valid measure of laryngeal activity at the brain stem level.
  • This technique can be utilized to further investigate the role of laryngeal reflexes in various physiological and pathological conditions.