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Cochlear implantation in auditory neuropathy spectrum disorders: role of transtympanic electrically evoked auditory brainstem responses and serial neural response telemetry

Published online by Cambridge University Press:  20 May 2021

S N Dutt ,
A Kumar ,
A A Mittal ,
S Vadlamani  and
S K Gaur
S N Dutt
Affiliation:
Department of Otorhinolaryngology, Head and Neck Surgery, Apollo Hospitals, Bangalore, India
A Kumar
Affiliation:
Audiology, Ashadeep ENT Centre, Bangalore, India
A A Mittal
Affiliation:
Department of Otorhinolaryngology, Head and Neck Surgery, Apollo Hospitals, Bangalore, India
S Vadlamani*
Affiliation:
Department of Otorhinolaryngology, Head and Neck Surgery, Apollo Hospitals, Bangalore, India
S K Gaur
Affiliation:
Department of Otorhinolaryngology, Head and Neck Surgery, Apollo Hospitals, Bangalore, India
*
Author for correspondence: Dr Swathi Vadlamani, Department of Otorhinolaryngology, Head and Neck Surgery, 154/11, Apollo Hospitals, Bannerghatta Road (opposite IIM), Bangalore, India – 560076 E-mail: vhkswat@gmail.com
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Abstract

Objective

To evaluate the utility of pre-operative transtympanic electrically evoked auditory brainstem responses and post-operative neural response telemetry in auditory neuropathy spectrum disorder patients.

Methods

Four auditory neuropathy spectrum disorder patients who had undergone cochlear implantation and used it for more than one year were studied. All four patients underwent pre-operative transtympanic electrically evoked auditory brainstem response testing, intra-operative and post-operative (at 3, 6 and 12 months after switch-on) neural response telemetry, and out-patient cochlear implant electrically evoked auditory brainstem response testing (at 12 months).

Results

Patients with better waveforms on transtympanic electrically evoked auditory brainstem response testing showed superior performance after one year of implant use. Neural response telemetry and electrically evoked auditory brainstem response measures improved in all patients.

Conclusion

Inferences related to cochlear implantation outcomes can be based on the waveform of transtympanic electrically evoked auditory brainstem responses. Robust transtympanic electrically evoked auditory brainstem responses suggest better performance. Improvements in electrically evoked auditory brainstem responses and neural response telemetry over time indicate that electrical stimulation is favourable in auditory neuropathy spectrum disorder patients. These measures provide an objective way to monitor changes and progress in auditory pathways following cochlear implantation.

Keywords

Auditory NeuropathyCochlear ImplantationEvoked PotentialsAuditoryBrain StemTelemetry
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 135 , Issue 7 , July 2021 , pp. 602 - 609
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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Footnotes

Dr S Vadlamani takes responsibility for the integrity of the content of the paper

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