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Related Experiment Videos

Inner ear changes with intracochlear gentamicin administration in Guinea pigs.

Takeshi Okuda1, Kazuma Sugahara, Hiroaki Shimogori

  • 1Department of Otolaryngology, Yamaguchi University School of Medicine, Yamaguchi, Japan.

The Laryngoscope
|April 6, 2004
PubMed
Summary

This study in guinea pigs found that moderate gentamicin doses (12 mg/mL) caused mild inner ear damage, while high doses (40 mg/mL) caused severe damage. This research aids in determining safe gentamicin dosages for Meniere's disease treatment.

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Area of Science:

  • Ototoxicology
  • Neuroscience
  • Pharmacology

Background:

  • Transtympanic gentamicin is a potential treatment for vertigo associated with Meniere's disease.
  • Determining the appropriate clinical dosage of gentamicin for inner ear conditions is challenging.

Purpose of the Study:

  • To investigate the relationship between gentamicin dosage and inner ear function in an animal model.
  • To establish an animal model for evaluating gentamicin's effects on cochlear and vestibular systems.

Main Methods:

  • Guinea pigs received varying concentrations of gentamicin via osmotic pumps in the inner ear.
  • Vestibular function was assessed using caloric nystagmus.
  • Cochlear function was evaluated by changes in auditory brainstem response (ABR) thresholds.

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Main Results:

  • High gentamicin concentrations (40 mg/mL) led to canal paralysis and significant ABR threshold shifts.
  • Moderate gentamicin concentrations (12 mg/mL) resulted in moderate ABR shifts and caloric malfunction.
  • Histopathology revealed severe damage at high doses, with some hair cell preservation at moderate doses.

Conclusions:

  • A viable animal model was developed to demonstrate moderate inner ear damage from moderate-dose gentamicin.
  • Appropriate gentamicin administration can achieve stable therapeutic effects on the inner ear.
  • Selecting precise gentamicin dosage protocols is crucial for safe and effective Meniere's disease treatment.