The Relationship Between Impedance, Programming and Word Recognition in a Large Clinical Dataset of Cochlear Implant Recipients

Author:

Caswell-Midwinter Benjamin123ORCID,Doney Elizabeth M.3,Arjmandi Meisam K.123,Jahn Kelly N.12ORCID,Herrmann Barbara S.13,Arenberg Julie G.123ORCID

Affiliation:

1. Department of Otolaryngology – Head and Neck Surgery, Harvard Medical School, Boston, MA, USA

2. Eaton-Peabody Laboratories, Boston, MA, USA

3. Massachusetts Eye and Ear, Audiology Division, Boston, MA, USA

Abstract

Cochlear implant programming typically involves measuring electrode impedance, selecting a speech processing strategy and fitting the dynamic range of electrical stimulation. This study retrospectively analyzed a clinical dataset of adult cochlear implant recipients to understand how these variables relate to speech recognition. Data from 425 implanted post-lingually deafened ears with Advanced Bionics devices were analyzed. A linear mixed-effects model was used to infer how impedance, programming and patient factors were associated with monosyllabic word recognition scores measured in quiet. Additional analyses were conducted on subsets of data to examine the role of speech processing strategy on scores, and the time taken for the scores of unilaterally implanted patients to plateau. Variation in basal impedance was negatively associated with word score, suggesting importance in evaluating the profile of impedance. While there were small, negative bivariate correlations between programming level metrics and word scores, these relationships were not clearly supported by the model that accounted for other factors. Age at implantation was negatively associated with word score, and duration of implant experience was positively associated with word score, which could help to inform candidature and guide expectations. Electrode array type was also associated with word score. Word scores measured with traditional continuous interleaved sampling and current steering speech processing strategies were similar. The word scores of unilaterally implanted patients largely plateaued within 6-months of activation. However, there was individual variation which was not related to initially measured impedance and programming levels.

Funder

NIH NIDCD

Publisher

SAGE Publications

Subject

Speech and Hearing,Otorhinolaryngology

Reference72 articles.

1. Advanced Bionics (2003). New methodology for fitting cochlear implants. Advanced Bionics Technical Reports. Available from: https://advancedbionics.com/us/en/home/professionals/document-library/ab-technical-reports.html (accessed 15 June 2020).

2. Advanced Bionics (2012). HiRes™ Optima clinical results. Sylmar, Calif, USA: Advanced Bionics White Paper. Available from: https://advancedbionics.com/content/dam/advancedbionics/Documents/Global/en_ce/Professional/Technical-Reports/Sound-Processing/HiRes-Optima-White-Paper.pdf (accessed 7 October 2020).

3. Probing the Electrode-Neuron Interface With Focused Cochlear Implant Stimulation

4. Identifying Cochlear Implant Channels with Poor Electrode-Neuron Interface: Partial Tripolar, Single-Channel Thresholds and Psychophysical Tuning Curves

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