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Intraoperative electrically evoked vestibular potentials in humans.

R Häusler1, A Kasper, B Demierre

  • 1Clinic for ENT, Head and Neck Surgery, Cantonal University Hospital, Geneve, Switzerland.

Acta Oto-Laryngologica
|January 1, 1992
PubMed
Summary

Researchers recorded electrically evoked vestibular potentials in Meniere's disease patients undergoing surgery. These potentials, specific to the vestibular system, could aid in intraoperative monitoring during vestibular nerve sectioning.

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Area of Science:

  • Neuroscience
  • Otolaryngology
  • Surgical Monitoring

Background:

  • Intractable Meniere's disease often necessitates surgical intervention, including vestibular neurectomy.
  • Accurate intraoperative identification of the vestibular nerve is crucial for effective and safe surgical outcomes.

Purpose of the Study:

  • To investigate the characteristics of electrically evoked short-latency vestibular potentials.
  • To determine the potential of these potentials for intraoperative electrophysiological monitoring during vestibular nerve surgery.

Main Methods:

  • Recording of short-latency potentials from 9 patients during vestibular neurectomy for Meniere's disease.
  • Stimulation of the VIIIth cranial nerve using bipolar electrodes and biphasic pulses.
  • Analysis of evoked potentials using averaged responses and monitoring for other nerve responses.

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Main Results:

  • A reproducible vertex-negative potential (approx. 2 ms latency, 0.5 microV amplitude) was consistently recorded.
  • This potential disappeared after selective vestibular neurectomy proximal to the stimulation site.
  • The response was unaffected by acoustic masking and distinct from facial nerve activity.

Conclusions:

  • The recorded vertex-negative potential is a specific electrophysiological response of the vestibular system.
  • Intraoperative recording of these potentials offers a viable method for monitoring vestibular nerve sectioning.
  • This technique may enhance the precision and safety of surgeries for vestibular disorders.