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Audiologic findings in botulism poisoning.

S Pijl1

  • 1Division of Otolaryngology, University of British Columbia, St. Paul's Hospital, Vancouver, Canada.

Ear and Hearing
|August 1, 1991
PubMed
Summary

Botulism poisoning can affect hearing by impairing the stapedius reflex. Audiologic findings in patients with botulism varied, showing abnormal tympanograms and elevated stapedius reflex thresholds.

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Area of Science:

  • Neurology
  • Audiology
  • Otolaryngology

Background:

  • Botulism causes neuromuscular transmission failure.
  • This may impact Eustachian tube and stapedius reflex function.

Purpose of the Study:

  • To present audiologic findings in normal-hearing patients with Type A botulism.
  • To explore potential pathophysiological mechanisms.

Main Methods:

  • Audiologic evaluation of five normal-hearing patients with Type A botulism.
  • Assessment of tympanometry and stapedius reflex thresholds.

Main Results:

  • Varied audiologic findings were observed.
  • Two patients showed Type B or C tympanograms early on.
  • Three patients had elevated stapedius reflex thresholds.
  • One patient exhibited reversible reflex decay with stimulus recovery.

Conclusions:

  • Botulism can lead to diverse audiologic abnormalities.
  • Stapedius reflex dysfunction is a notable finding in botulism patients.
  • Further research into pathophysiological mechanisms is warranted.

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