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Simultaneous Extratympanic Electrocochleography and Auditory Brainstem Responses Revisited.
Carlos Minaya1, Samuel R Atcherson1
1Department of Audiology and Speech Pathology, University of Arkansas for Medical Sciences and University of Arkansas at Little Rock , AR, USA.
Audiology Research
|November 12, 2015
Summary
This study revisits simultaneous extratympanic electrocochleography (ECoG) and auditory brainstem response (ABR) recording. The technique, using separate channels, offers a larger ECoG action potential than ABR Wave I, potentially aiding neurodiagnosis.
Area of Science:
- Audiology
- Neurophysiology
- Medical Instrumentation
Background:
- Simultaneous recording of electrocochleography (ECoG) and auditory brainstem response (ABR) can improve diagnostic efficiency.
- Previous methods sometimes used a single extratympanic electrode for both ECoG and ABR, potentially compromising signal quality.
Purpose of the Study:
- To evaluate a two-channel, simultaneous click-evoked extratympanic electrocochleography and auditory brainstem response recording technique for clinical use.
- To assess the feasibility and utility of this technique in normal-hearing participants.
Main Methods:
- Utilized a two-channel recording setup with separate montages: vertical for ABR (Cz to ipsilateral earlobe) and horizontal for ECoG (tympanic membrane to contralateral earlobe) using an extratympanic electrode.
- Presented broadband clicks at 85 dB nHL with alternating polarity at stimulus rates of 9.3, 11.3, and 15.3/s.
- Compared ECoG action potential (AP) and ABR Wave I amplitudes and morphology across stimulation rates.
Main Results:
- The ECoG action potential (AP) amplitude was larger than the ABR Wave I amplitude.
- No significant differences in results were found across the tested stimulation rates.
- Extratympanic electrode placement required minimal additional clinical time.
Conclusions:
- Simultaneous extratympanic ECoG and ABR recording with separate channel montages is a viable clinical technique.
- This method may enhance the neurodiagnostic value of ABR, particularly when Wave I is diminished.
- The technique is efficient and does not significantly impact overall test duration.
