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Changes in cochlear function after double-membrane rupture in the guinea pig

M Saitoh1, H Ueda, N Yanagita

  • 1Department of Otorhinolaryngology, Nagoya University, School of Medicine, Japan.

Hearing Research
|February 1, 1997
PubMed
Summary
This summary is machine-generated.

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Double-membrane rupture in guinea pigs caused acute sensorineural hearing loss. This hearing loss resulted from cochlear damage, likely due to endolymph influx and morphological changes.

Area of Science:

  • Otolaryngology
  • Auditory Neuroscience
  • Otoacoustic Emissions

Background:

  • Rupture of the round window membrane can compromise cochlear function.
  • Localized cochlear damage, including Reissner's membrane and stria vascularis, may exacerbate hearing deficits.

Purpose of the Study:

  • To investigate the effects of round window membrane rupture alone versus combined with localized cochlear damage on auditory function in guinea pigs.
  • To determine the impact of double-membrane rupture on transiently evoked otoacoustic emissions (TEOAEs), compound action potentials (CAPs), and cochlear microphonics (CMs).

Main Methods:

  • Auditory evoked potentials (TEOAEs, CAPs, CMs) were measured in guinea pigs.
  • Two experimental groups were used: round window membrane rupture alone (n=5) and round window membrane rupture with localized cochlear damage (n=10).

Related Experiment Videos

  • Endocochlear potential (EP) was measured in the localized damage group.

    • Main Results:

    • No significant changes in TEOAEs, CAPs, or CMs were observed after round window membrane rupture alone.
    • Rupture of the round window membrane with localized cochlear damage led to increased minimal detectable levels of CAPs and CMs, with absent TEOAEs.
    • The endocochlear potential was measured in the cochlea with localized damage.

    Conclusions:

    • Double-membrane rupture (round window membrane rupture with localized cochlear damage) induces acute sensorineural hearing loss in guinea pigs.
    • Hearing loss is attributed to cochlear damage, potentially caused by potassium-rich endolymph influx into the perilymph and morphological damage to the scala media.