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Related Experiment Videos

Impairment in cochlear function produced by chloramphenicol and noise.

C M Henley, R D Brown, J E Penny

    Neuropharmacology
    |February 1, 1984
    PubMed
    Summary

    Chloramphenicol and noise exposure can cause temporary hearing loss. However, the addition of otitis media may lead to permanent cochlear damage.

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    Area of Science:

    • Ototoxicology
    • Neuroscience
    • Pharmacology

    Background:

    • Chloramphenicol is an antibiotic with known ototoxic potential.
    • Noise exposure is a common cause of hearing impairment.
    • The interaction between chloramphenicol and noise on hearing has not been fully elucidated.

    Purpose of the Study:

    • To investigate the ototoxic interaction between chloramphenicol and noise in rats.
    • To determine the impact of co-exposure on cochlear function and anatomy.
    • To assess the role of otitis media in potentiating ototoxicity.

    Main Methods:

    • Two studies were conducted on rats involving exposure to high-intensity noise and oral administration of chloramphenicol.
    • Cochlear function was assessed using round window recordings of cochlear microphonics and auditory nerve action potentials.

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  • Histopathological examination was performed to evaluate anatomical damage.

    • Main Results:

    • Permanent ototoxicity and cochlear damage were observed in rats exposed to noise and chloramphenicol.
    • Temporary cochlear function depression was noted, with recovery after five days in the second study.
    • Purulent otitis media occurred in 57% of animals in the first study, but 0% in the second.

    Conclusions:

    • The combination of chloramphenicol and noise can induce temporary cochlear deficits.
    • The presence of otitis media alongside chloramphenicol and noise exposure appears to cause permanent cochlear impairment.
    • This suggests a complex interplay of factors contributing to drug- and noise-induced hearing loss.