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Comparing Simultaneous Electrocochleography and Auditory Brainstem Response Measurements Using Three Different

Shannon M Lefler1,2, Wafaa A Kaf1, John A Ferraro3

  • 1Communications Sciences and Disorders Department, Missouri State University, Springfield, Missouri.

Journal of the American Academy of Audiology
|June 3, 2021
PubMed
Summary

Tympanic membrane electrodes provide more reliable electrocochleography (ECochG) and auditory brainstem response (ABR) measurements than ear canal electrodes. These findings aid clinicians and researchers in selecting optimal extratympanic electrodes for ECochG and ABR testing.

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Extratympanic electrodes are widely used for electrocochleography (ECochG) and auditory brainstem response (ABR) measurements in clinical and research settings.
  • Variations in electrode type and placement may influence ECochG and ABR outcomes.

Purpose of the Study:

  • To compare ECochG and ABR responses using three distinct extratympanic electrodes simultaneously.
  • To inform clinicians and researchers about the impact of electrode type and recording site on ECochG and ABR results.
  • To offer normative data and guidance on preferred electrode selection for simultaneous ECochG and ABR testing.

Main Methods:

  • A repeated-measures study involving 20 young adult females with normal hearing.
  • Simultaneous ECochG and ABR recordings using a three-channel system with alternating polarity click stimuli.
  • Measurements were taken using a TipTrode (ear canal) electrode and tympanic membrane (TM) electrodes in separate sessions.

Main Results:

  • Tympanic membrane electrodes produced larger suprathreshold amplitudes compared to the ear canal TipTrode electrode.
  • TM electrodes resulted in smaller summating potential (SP)-action potential (AP) ratios and lower AP thresholds.
  • Measurements obtained with TM electrodes exhibited less variability than those from the ear canal electrode.

Conclusions:

  • Tympanic membrane electrodes offer advantages over ear canal electrodes for ECochG and ABR measurements, including larger amplitudes, smaller SP-AP ratios, lower thresholds, and reduced variability.
  • These findings provide valuable insights for selecting appropriate extratympanic electrodes in audiological assessments and research.
  • The study contributes to the literature by offering normative data and practical guidance for ECochG and ABR testing procedures.