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Chorda tympani nerve function after middle ear surgery.

Matthew P A Clark1, Steve O'Malley

  • 1Department of ENT, Northampton General Hospital, Northampton, England, UK. mattanna99@hotmail.com

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|January 2, 2007
PubMed
Summary
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Middle ear surgery for cholesteatoma causes less taste disturbance than myringoplasty or stapedectomy. This suggests cholesteatoma may make the chorda tympani nerve less prone to injury-related taste changes.

Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Surgical Outcomes

Background:

  • The chorda tympani nerve is crucial for taste sensation.
  • Middle ear surgeries, including myringoplasty, stapedectomy, and cholesteatoma removal, carry a risk of iatrogenic injury to this nerve.
  • Postoperative taste disturbance is a known complication.

Purpose of the Study:

  • To evaluate chorda tympani nerve function following different middle ear surgical procedures.
  • To test the hypothesis that cholesteatoma surgery leads to less taste disturbance compared to myringoplasty or stapedectomy.

Main Methods:

  • A prospective questionnaire study was conducted.
  • Adult patients undergoing middle ear surgery with anulus elevation were included.
  • Taste sensation changes were monitored post-surgery with follow-up for recovery.

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Main Results:

  • Myringoplasty and stapedectomy resulted in a higher incidence of taste disturbance than procedures for cholesteatoma.
  • This finding held true regardless of the degree of nerve injury.
  • Metallic taste was the most frequently reported sensation after chorda tympani nerve injury.

Conclusions:

  • The study supports the hypothesis that iatrogenic chorda tympani nerve injury during cholesteatoma surgery causes less taste disturbance than in otosclerosis surgery.
  • This could be due to the hypofunctional state of the nerve in cholesteatoma patients.
  • Further research with larger cohorts is recommended to validate these findings, especially concerning myringoplasty outcomes.