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Vestibular neuritis: etiopathogenesis.

J Bartual-Pastor1

  • 1Catedrático de Otorrinolaringología de la Universidad de Cádiz, Jefe del Servicio de Otorrinolaringología del Hospital Clínico Universitario de Puerto Real, Carretera Nacional IV, Km 665, 11510 Puerto Real (Cádiz), Spain. juan.bartual@uca.es

Revue De Laryngologie - Otologie - Rhinologie
|February 25, 2006
PubMed
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Vestibular neuritis, a sudden vertigo condition, is likely caused by viral infections affecting the vestibular nerve. Inflammation and demyelination can lead to irreversible function loss.

Area of Science:

  • Neurology
  • Otolaryngology
  • Virology

Background:

  • Vestibular neuritis is characterized by sudden, unilateral vertigo without hearing loss or neurological deficits.
  • The condition affects both sexes equally, with peak incidence in individuals aged 40-50.
  • While viral infections are suspected, other etiologies like bacterial, protozoan, allergic, and autoimmune causes have been proposed.

Purpose of the Study:

  • To investigate the underlying causes and inflammatory mechanisms of vestibular neuritis.
  • To explore the role of viral infections in the etiology of vestibular neuritis.

Main Methods:

  • Analysis of plasma fibrinogen and C-reactive protein (CRP) levels during the acute phase.
  • Brainstem Auditory Evoked Response (BAER) latency and I-III interval measurements.

Related Experiment Videos

  • Enhanced Magnetic Resonance Imaging (MRI) with gadolinium uptake in the vestibular nerve and Scarpa's ganglion.
  • Histological examination of temporal bones from affected individuals.
  • Development of an animal model using retroauricular inoculation of herpes simplex virus in mice.
  • Infection of cultured Schwann cells with influenza A virus.

    • Main Results:

    • Elevated plasma fibrinogen and CRP levels indicate an inflammatory process.
    • Prolonged BAER latency and I-III interval suggest nerve dysfunction.
    • Increased gadolinium uptake on MRI confirms inflammation of the vestibular nerve and Scarpa's ganglion.
    • Histological findings and the animal model support viral infection as a primary cause.
    • Influenza A virus infection in Schwann cells further implicates viral agents.

    Conclusions:

    • Vestibular neuritis is an inflammatory condition of the vestibular nerve, often triggered by viral infections.
    • Demyelination and subsequent functional loss may not always be reversible.
    • Herpes simplex virus and influenza A virus are implicated as potential etiological agents.