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Related Experiment Videos

Auditory sensori-neural alterations induced by salicylate.

Y Cazals1

  • 1Inserm EPI 9902 Pathologies de l'oreille interne et réhabilitation, Laboratoire Otologie NeuroOtologie, Faculté de Médecine Nord, Univ. Méditerranée Aix-Marseille II, 13916 Marseille Cedex 20, France. cazals.y@jean-roche.univ-mrs.fr

Progress in Neurobiology
|July 6, 2000
PubMed
Summary

High doses of salicylate, like aspirin, can cause temporary hearing issues including tinnitus and reduced sensitivity. These auditory effects are reversible upon stopping the medication.

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Area of Science:

  • Oto-neuroscience
  • Pharmacology
  • Audiology

Background:

  • Auditory toxicity from salicylate (aspirin) has been documented for nearly 150 years, primarily at high doses used for chronic inflammatory conditions.
  • Reported auditory alterations include tinnitus, temporary hearing loss, and changes in sound perception, all of which are reversible.

Purpose of the Study:

  • To investigate the mechanisms underlying salicylate-induced auditory toxicity.
  • To correlate human subjective reports with objective physiological and anatomical findings in the auditory system.

Main Methods:

  • Review of human subject reports on auditory alterations after salicylate ingestion.
  • Animal behavioral studies demonstrating hearing loss and tinnitus.
  • Anatomical examination of cochlear structures, particularly outer hair cells.

Related Experiment Videos

  • Electrophysiological recordings from the cochlea, auditory nerve, and brainstem.
  • In vitro studies on isolated outer hair cells.
  • Analysis of otoacoustic emissions and acoustically evoked neural responses.

    • Main Results:

    • Salicylate toxicity primarily affects the lateral membrane of outer hair cells, leading to reduced motile responses.
    • Objective measures show reversible hearing loss and broadened frequency filtering, correlating with human audiometric findings.
    • Increased spontaneous neural activity in the auditory nerve and central auditory pathways is observed, potentially underlying tinnitus.
    • Cochlear blood supply may decrease under autonomous innervation control.

    Conclusions:

    • Salicylate-induced auditory toxicity stems from impaired outer hair cell function and altered neural activity.
    • Tinnitus may result from increased spontaneous neural firing in high-frequency pathways.
    • The observed effects are dose-dependent, progressive, and reversible upon cessation of salicylate treatment.