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Piloting the Recording of Electrode Voltages (REVS) using surface electrodes as a test to identify cochlear implant electrode migration, extra-cochlear electrodes and basal electrodes causing discomfort

Piloting the Recording of Electrode Voltages (REVS) using surface electrodes as a test to identify cochlear implant electrode migration, extra-cochlear electrodes and basal electrodes causing discomfort
Piloting the Recording of Electrode Voltages (REVS) using surface electrodes as a test to identify cochlear implant electrode migration, extra-cochlear electrodes and basal electrodes causing discomfort

Objectives: To determine if Electrode Voltage (EV) measurements are potentially suitable as a test for detecting extra-cochlear electrodes in cochlear implants (CIs). Methods: EV measurements were made using surface electrodes in live mode in 17 adult cochlear implant (CI) users. Repeatability, the effects of stimulation level, CI active electrode position, (active) recording electrode position and stimulation mode (for Nucleus devices) were investigated. Results/discussion: Recordings made in monopolar mode showed good repeatability when the active recording electrode was placed on the ipsilateral earlobe; voltages increased linearly with stimulation level as expected. EVs for basal electrodes differed greatly between partially inserted/migrated devices, fully inserted devices with all electrodes activated, and those with deactivated basal electrodes [χ 2(2) = 10.2, p < 0.05 for the most basal electrode]. EVs for Nucleus devices were small for electrodes on the array when compared to those for monopolar return electrodes, except for the participant with extra-cochlear electrodes. We argue that fibrosis around the electrode array facilitated current flow across the round window in this case. Conclusion: The test appears to be a viable approach to detect electrode migration and extra-cochlear electrodes in adult CI users and may also be sensitive to discomfort caused by current leakage from the basal end of the cochlea.

Cochlear implant, Electrode, Extra-cochlear, Fibrosis, Integrity test, Migration, Partial insertion, Voltage
1467-0100
1-13
Grasmeder, Mary
206e6b44-d1cd-43f5-99ac-588ab02d44ef
Verschuur, Carl
5e15ee1c-3a44-4dbe-ad43-ec3b50111e41
Ferris, Robyn
7ae44ab0-5b66-420e-99cd-fbb34851e55b
Basodan, Sundus
59052a81-41fc-4c83-a74a-077b6aa557aa
Newman, Tracey
322290cb-2e9c-445d-a047-00b1bea39a25
Sanderson, Alan Peter
79d72ecf-7722-4a39-be5f-a041ba423c2b
Grasmeder, Mary
206e6b44-d1cd-43f5-99ac-588ab02d44ef
Verschuur, Carl
5e15ee1c-3a44-4dbe-ad43-ec3b50111e41
Ferris, Robyn
7ae44ab0-5b66-420e-99cd-fbb34851e55b
Basodan, Sundus
59052a81-41fc-4c83-a74a-077b6aa557aa
Newman, Tracey
322290cb-2e9c-445d-a047-00b1bea39a25
Sanderson, Alan Peter
79d72ecf-7722-4a39-be5f-a041ba423c2b

Grasmeder, Mary, Verschuur, Carl, Ferris, Robyn, Basodan, Sundus, Newman, Tracey and Sanderson, Alan Peter (2021) Piloting the Recording of Electrode Voltages (REVS) using surface electrodes as a test to identify cochlear implant electrode migration, extra-cochlear electrodes and basal electrodes causing discomfort. Cochlear Implants International, 1-13. (doi:10.1080/14670100.2020.1863701).

Record type: Article

Abstract

Objectives: To determine if Electrode Voltage (EV) measurements are potentially suitable as a test for detecting extra-cochlear electrodes in cochlear implants (CIs). Methods: EV measurements were made using surface electrodes in live mode in 17 adult cochlear implant (CI) users. Repeatability, the effects of stimulation level, CI active electrode position, (active) recording electrode position and stimulation mode (for Nucleus devices) were investigated. Results/discussion: Recordings made in monopolar mode showed good repeatability when the active recording electrode was placed on the ipsilateral earlobe; voltages increased linearly with stimulation level as expected. EVs for basal electrodes differed greatly between partially inserted/migrated devices, fully inserted devices with all electrodes activated, and those with deactivated basal electrodes [χ 2(2) = 10.2, p < 0.05 for the most basal electrode]. EVs for Nucleus devices were small for electrodes on the array when compared to those for monopolar return electrodes, except for the participant with extra-cochlear electrodes. We argue that fibrosis around the electrode array facilitated current flow across the round window in this case. Conclusion: The test appears to be a viable approach to detect electrode migration and extra-cochlear electrodes in adult CI users and may also be sensitive to discomfort caused by current leakage from the basal end of the cochlea.

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Electrode voltages and extra cochlear electrodes revision 2 finalised - Author's Original
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Electrode voltages and extra cochlear electrodes final version - Accepted Manuscript
Restricted to Repository staff only until 6 January 2022.
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Submitted date: 27 November 2020
Accepted/In Press date: 1 January 2021
e-pub ahead of print date: 6 January 2021
Keywords: Cochlear implant, Electrode, Extra-cochlear, Fibrosis, Integrity test, Migration, Partial insertion, Voltage

Identifiers

Local EPrints ID: 445393
URI: http://eprints.soton.ac.uk/id/eprint/445393
ISSN: 1467-0100
PURE UUID: 2753e829-d609-4dd0-b9d2-a7079c9aea16
ORCID for Tracey Newman: ORCID iD orcid.org/0000-0002-3727-9258

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Date deposited: 07 Dec 2020 17:32
Last modified: 18 Feb 2021 16:46

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Contributors

Author: Mary Grasmeder
Author: Carl Verschuur
Author: Robyn Ferris
Author: Sundus Basodan
Author: Tracey Newman ORCID iD
Author: Alan Peter Sanderson

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