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Electrocochleography in syphilitic hearing loss

T Nagasaki1, Y Watanabe, S Aso

  • 1Department of Otolaryngology, Faculty of Medicine, Toyama Medical and Pharmaceutical University, Japan.

Acta Oto-Laryngologica. Supplementum
|January 1, 1993
PubMed
Summary

Syphilitic labyrinthitis, a cause of hearing loss and vertigo, shares electrocochleography (ECochG) findings with Meniere's disease. This study found similar abnormal inner ear fluid pressure indicators in both conditions.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Infectious Diseases

Background:

  • Syphilitic labyrinthitis causes hearing loss, tinnitus, and vertigo.
  • It is classified as an endolymphatic hydropic disease.
  • Previous research explored Meniere's disease and ECochG.

Purpose of the Study:

  • To investigate the relationship between syphilitic hydrops and ECochG findings.
  • To compare ECochG results in syphilitic labyrinthitis patients with other hearing loss conditions.

Main Methods:

  • Electrocochleography (ECochG) was performed on 22 patients with diagnosed syphilitic labyrinthitis.
  • ECochG findings were analyzed, focusing on the Summating Potential/Action Potential (SP/AP) ratio.
  • Results were compared to those from patients with Meniere's disease, delayed endolymphatic hydrops, sudden deafness, and sensorineural hearing loss.

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Main Results:

  • Increased SP/AP ratio (>0.37), indicative of hydrops, was observed in 56.0% of tested ears.
  • The SP/AP ratio in syphilitic labyrinthitis was not significantly different from Meniere's disease or delayed endolymphatic hydrops.
  • The SP/AP ratio was significantly higher than in sudden deafness and other sensorineural hearing loss types.

Conclusions:

  • Electrocochleographic features of syphilitic labyrinthitis resemble those of Meniere's disease.
  • Syphilis can induce endolymphatic hydrops similar to that seen in Meniere's disease.
  • ECochG can help differentiate syphilitic labyrinthitis from other forms of sensorineural hearing loss.