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Published on: January 22, 2010

Secondary endolymphatic hydrops after sudden deafness.

Tsung-Yi Cho1, Po-Wen Cheng, Yi-Ho Young

  • 1Department of Otolaryngology, Far Eastern Memorial Hospital , Taipei.

Acta Oto-Laryngologica
|September 17, 2013
PubMed
Summary

Patients with sudden deafness may develop secondary hydrops years later. Abnormal vestibular-evoked myogenic potential (VEMP) responses, particularly ocular VEMP (oVEMP) and cervical VEMP (cVEMP), combined with normal caloric function, predict this later development.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Vestibular System Research

Background:

  • Sudden deafness can have long-term sequelae.
  • The development of secondary endolymphatic hydrops after initial sudden deafness is not fully understood.

Purpose of the Study:

  • To investigate the mechanisms of secondary endolymphatic hydrops development years after sudden deafness.
  • To identify predictive markers for secondary hydrops in patients with a history of sudden deafness.

Main Methods:

  • An inner ear test battery including audiometry, caloric testing, and vestibular-evoked myogenic potentials (VEMPs) was applied.
  • Two groups of patients with prior sudden deafness were compared: those with recent vertiginous attacks and those without.

Main Results:

  • Patients experiencing vertiginous attacks years after sudden deafness showed a high percentage of abnormal cervical VEMP (cVEMP) and ocular VEMP (oVEMP) responses.
  • Caloric testing revealed significant differences between groups, suggesting preserved caloric function in some patients who later developed hydrops.
  • Hearing levels did not significantly differ between groups.

Conclusions:

  • Abnormal oVEMP and cVEMP responses, alongside preserved caloric function, in patients with sudden deafness may indicate a risk for developing secondary hydrops.
  • Secondary hydrops can manifest a mean of 8 years after the initial sudden deafness event.