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Differences in vestibulo-ocular reflexes between vestibular neuritis and labyrinthitis.

Gi-Sung Nam1, Wonyong Baek1, Min Seok Kim2

  • 1Department of Otorhinolaryngology - Head and Neck Surgery Chosun University College of Medicine Gwangju South Korea.

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Summary

Vestibular neuritis and labyrinthitis show distinct patterns in semicircular canal vestibulo-ocular reflex (VOR) gains. These differences, particularly in the posterior canal, aid in distinguishing the two conditions.

Keywords:
head‐impulse testlabyrinthitissudden hearing lossvertigovestibular neuritisvestibulo‐ocular reflex

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Area of Science:

  • Neurology
  • Otolaryngology
  • Vestibular System Physiology

Background:

  • Vestibular neuritis and labyrinthitis are common causes of vertigo.
  • Understanding their distinct pathophysiological mechanisms is crucial for accurate diagnosis and treatment.
  • The vestibulo-ocular reflex (VOR) is a key indicator of vestibular function.

Purpose of the Study:

  • To investigate differences in VOR function across the three semicircular canals in patients with vestibular neuritis versus labyrinthitis.
  • To identify specific VOR parameters that can differentiate between these two vestibular disorders.

Main Methods:

  • Retrospective analysis of 23 vestibular neuritis and 27 labyrinthitis patients.
  • Utilized pure-tone audiometry, bithermal caloric testing, and video head-impulse testing (vHIT) within 5 days of symptom onset.
  • Compared VOR gains and corrective saccades across the horizontal, anterior, and posterior semicircular canals between the two groups.

Main Results:

  • Vestibular neuritis showed reduced VOR gains in the ipsilesional horizontal (0.51) and anterior (0.55) canals, with preserved gain in the posterior canal (0.85).
  • Labyrinthitis presented with VOR gains of 0.72 (horizontal), 0.73 (anterior), and 0.55 (posterior) in the ipsilesional canals.
  • Significant differences in VOR gain and corrective saccades were found across all three canals between the groups (p < .003).

Conclusions:

  • Vestibular neuritis and labyrinthitis exhibit distinct patterns of semicircular canal involvement on vHIT.
  • Pure-tone audiometry, posterior canal VOR gain, and posterior canal gain asymmetry are effective in differentiating labyrinthitis from vestibular neuritis.
  • These findings suggest potentially different etiologies for vestibular neuritis and labyrinthitis.