Simultaneous extratympanic electrocochleography and auditory brainstem responses revisited

  • Carlos Minaya Department of Audiology and Speech Pathology, University of Arkansas for Medical Sciences and University of Arkansas at Little Rock, AR, United States.
  • Samuel R. Atcherson | sratcherson@ualr.edu Department of Audiology and Speech Pathology, University of Arkansas for Medical Sciences and University of Arkansas at Little Rock, AR, United States.

Abstract

The purpose of this study was to revisit the two-channel, simultaneous click-evoked extratympanic electrocochleography and auditory brainstem response (ECoG/ABR) recording technique for clinical use in normal hearing participants. Recording the compound action potential (AP) of the ECoG simultaneously with ABR may be useful when Wave I of the ABR is small or diminished in patients with sensorineural or retrocochlear disorder and minimizes overall test time. In contrast to some previous studies that used the extratympanic electrode both as non-inverting electrode for the ECoG and inverting electrode for ABR, this study maintained separate recording channel montages unique to conventional click-evoked ECoG and ABR recordings. That is, the ABR was recorded using a vertical channel (Cz to ipsilateral earlobe), while the ECoG with custom extratympanic electrode was recorded using a horizontal channel (tympanic membrane to contralateral earlobe). The extratympanic electrode is easy to fabricate inhouse, or can be purchased commercially. Maintaining the conventional ABR montage permits continued use of traditional normative data. Broadband clicks at a fixed level of 85 dB nHL were presented with alternating polarity at stimulus rates of 9.3, 11.3, and 15.3/s. Different stimulation rates were explored to identify the most efficient rate without sacrificing time or waveform morphology. Results revealed larger ECoG AP than ABR Wave I, as expected, and no significant difference across stimulation rate and no interaction effect. Extratympanic electrode placement takes little additional clinic time and may improve the neurodiagnostic utility of the ABR.

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Author Biography

Carlos Minaya, Department of Audiology and Speech Pathology, University of Arkansas for Medical Sciences and University of Arkansas at Little Rock, AR
Carlos P. Minaya, B.S. received his undergraduate degree from the University of Connecticut and is currently a 4th year Doctor of Audiology (Au.D.) extern in Little Rock, AR. He is author of two peer-reviewed articles, and has presented his work as a student at various conferences in the U.S. Mr. Minaya will graduate with his doctorate in May 2014.
Published
2015-03-03
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Original Articles
Keywords:
extratympanic, electrocochleography, auditory brainstem response, electrode, simultaneous.
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How to Cite
Minaya, C., & Atcherson, S. R. (2015). Simultaneous extratympanic electrocochleography and auditory brainstem responses revisited. Audiology Research, 5(1). https://doi.org/10.4081/audiores.2015.105