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Related Experiment Videos

Aminoglycoside-induced ototoxicity.

P J Govaerts1, J Claes, P H van de Heyning

  • 1Department of Otorhinolaryngology, University of Antwerp, Wilrijk, Belgium.

Toxicology Letters
|August 1, 1990
PubMed
Summary
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Aminoglycoside antibiotics (AG) can cause ototoxicity, affecting hearing and balance. While incidence is estimated at 7.5%, risk factors remain unclear, and new research challenges accumulation theories.

Area of Science:

  • Pharmacology
  • Ototoxicology
  • Internal Medicine

Background:

  • Aminoglycoside antibiotics (AG) are crucial for treating bacterial infections.
  • Otoxicity, a significant side effect of AGs, impacts both auditory (cochlear) and vestibular functions.
  • Existing literature presents numerous controversies regarding AG-induced ototoxicity.

Purpose of the Study:

  • To review and synthesize current literature on aminoglycoside-induced ototoxicity.
  • To address controversies surrounding the incidence, risk factors, pathology, pharmacokinetics, and pharmacodynamics of AG ototoxicity.
  • To explore potential mechanisms underlying AG ototoxicity.

Main Methods:

  • Comprehensive literature review of studies on aminoglycoside ototoxicity.
  • Analysis of epidemiological data for incidence estimation.

Related Experiment Videos

  • Examination of pathological, pharmacokinetic, and pharmacodynamic studies.
  • Evaluation of proposed risk factors and etiological hypotheses.

    • Main Results:

    • Estimated incidence of cochlear and vestibulotoxic side-effects is 7.5% for each.
    • Netilmicin shows a potentially lower ototoxic profile.
    • Key risk factors like age, therapy duration, and organ dysfunction are likely important but not definitively established.
    • Pathological changes in the cochlea are degenerative and unspecific.
    • Pharmacokinetic studies refute AG accumulation in perilymph and endolymph.
    • Key pharmacodynamic hypotheses involve drug binding to glycosaminoglycans and interference with phosphoinositide metabolism in hair cells.

    Conclusions:

    • Aminoglycoside ototoxicity remains a complex issue with unresolved controversies.
    • While incidence is estimated, definitive risk factors and etiological pathways require further investigation.
    • Current evidence challenges AG accumulation in inner ear fluids, shifting focus to cellular mechanisms.