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The relationship between round window and ear canal Cochlear microphonic. | LitMetric

AI Article Synopsis

  • The study investigates whether cochlear microphonic measured at the ear canal (CM-EC) can effectively replace the one measured at the round window (CM-RW) for clinical purposes, noting that CM-EC is preferred for its non-invasive nature.
  • The research involved nine guinea pigs divided into groups that experienced different noise exposures to assess the impact on cochlear microphonic recordings across speech frequencies.
  • Results showed a significant correlation between CM-RW and CM-EC, highlighting the effectiveness of CM-EC as a valuable tool for evaluating hearing function and supporting its clinical use.

Article Abstract

Hypothesis: Cochlear microphonic recorded at ear canal (CM-EC) can be a substitute for the one recorded at round window (CM-RW).

Background: Almost all clinics do not measure tone-burst evoked CM due to technical difficulty although it can provide more information than click evoked CM. Moreover, clinicians like the CM-EC more than that measured at CM-RW because CM-EC is non-invasive. There is difference between CM-RW and CM-EC, for example, CM-EC is less prominent than CM-RW, therefore, studying tone-burst evoked CM-EC and its relationship with CM-RW are highly significant and can promote the clinical application of CM-EC.

Method: Nine guinea pigs were randomly allocated into three groups, group 1 was not exposed to noise, called normal control. group 2 and group 3 were exposed to the low- (0.5-2 kHz) and high-frequency band-noise (6-8 kHz) at 120 dB SPL for 1 h, respectively. It was difficulty to record low-frequency CM due to severe environmental interruption, in current study the recording technology of tone-burst evoked CM was optimized so that tone-burst evoked CM was measured across full speech frequency (0.5-8 kHz) in the presence of normal hearing and noise induced hearing loss (NIHL).

Results: CM-RW and CM-EC were successfully recorded across speech frequency. Significant reduction in CM amplitude was observed at 0.5 and 2 kHz in group 2, at 6 and 8 kHz in group 3 as compared to group 1,  < , indicating that CM amplitude was sensitive to band-noise exposure. Significant correlation between CM-RW and CM-EC was also verified,  < .

Conclusion: CM-EC is a useful objective test for evaluation of hearing function; the result of current study supports the clinical application of non-invasive CM-EC.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9764817PMC
http://dx.doi.org/10.1002/lio2.964DOI Listing

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