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Reversible changes in inner ear function following hyaluronan application in the middle ear.

M Anniko1, S Hellström, C Laurent

  • 1Department of Oto-Rhino-Laryngology & Head and Neck Surgery, Umeå University Hospital, Sweden.

Acta Oto-Laryngologica. Supplementum
|January 1, 1987
PubMed
Summary

Hyaluronan exposure in rats showed temporary hearing changes, with initial improvements and impairments at specific frequencies. After three months, hearing returned to normal, indicating no permanent ototoxicity.

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Area of Science:

  • Ototoxicity research
  • Auditory neuroscience
  • Pharmacological safety studies

Background:

  • Hyaluronan is widely used in medical applications.
  • Understanding its safety profile, particularly ototoxicity, is crucial.
  • Previous research on hyaluronan's effects on the inner ear is limited.

Purpose of the Study:

  • To evaluate the potential ototoxic effects of 1.9% hyaluronan.
  • To assess the reversibility of any induced auditory changes.
  • To investigate the impact of hyaluronan on inner ear function in a rodent model.

Main Methods:

  • A safety study involving 20 rats was conducted.
  • Middle ear administration of 1.9% hyaluronan was performed three times.
  • Auditory brainstem response (ABR) measurements were used to evaluate inner ear function at various time points.

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Main Results:

  • Temporary hearing threshold alterations were observed at different frequencies post-hyaluronan administration.
  • Hearing thresholds improved at lower frequencies (2-6 kHz) after one month.
  • All ABR thresholds normalized by three months, with residual middle ear material in some subjects.

Conclusions:

  • Hyaluronan administration resulted in reversible changes in inner ear function.
  • The study concluded that hyaluronan does not exhibit ototoxic adverse effects.
  • Long-term safety of hyaluronan in auditory function is supported by these findings.