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Related Experiment Videos

Topical gentamicin and ethacrynic acid: effects on cochlear function

B J Conlon1, S D McSwain, D W Smith

  • 1Hearing Research Laboratories, Division of Otolaryngology--Head and Neck Surgery, Duke University Medical Center, Durham, North Carolina 27710, USA.

The Laryngoscope
|July 17, 1998
PubMed
Summary
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Ethacrynic acid does not potentiate gentamicin ototoxicity when applied topically to the round window. Systemic gentamicin combined with ethacrynic acid, however, significantly increased cochlear damage.

Area of Science:

  • Ototoxicity research
  • Pharmacology
  • Auditory science

Background:

  • Aminoglycoside antibiotics like gentamicin can cause ototoxicity.
  • Loop diuretics, such as ethacrynic acid, are known to potentiate aminoglycoside ototoxicity when administered systemically.
  • The ototoxic potential of topical gentamicin in conjunction with ethacrynic acid has not been fully elucidated.

Purpose of the Study:

  • To investigate if concurrent intravenous ethacrynic acid administration enhances the ototoxicity of topically applied gentamicin on the round window.
  • To compare the effects of topical versus systemic gentamicin combined with ethacrynic acid on cochlear function.

Main Methods:

  • Guinea pigs were used to assess cochlear sensitivity changes via compound action potential (CAP) threshold monitoring.

Related Experiment Videos

  • Ethacrynic acid was administered intravenously, while gentamicin was applied topically or systemically.
  • Experimental groups included combinations of topical/systemic gentamicin with ethacrynic acid, and controls.

    • Main Results:

    • Topical gentamicin combined with ethacrynic acid did not lead to significant cochlear sensitivity deterioration.
    • Systemic gentamicin combined with ethacrynic acid resulted in profound increases in CAP thresholds, indicating significant ototoxicity.
    • Animals receiving only topical gentamicin or intravenous ethacrynic acid showed no significant ototoxic effects.

    Conclusions:

    • Ethacrynic acid potentiates aminoglycoside ototoxicity by enhancing antibiotic entry from systemic circulation into the endolymph.
    • Topical application of aminoglycoside agents in combination with loop diuretics appears to be safe, unlike systemic administration.
    • Findings address clinical safety concerns regarding combined use of topical antibiotics and diuretics.