Hearing Loss, Profound, Hearing Loss, Unilateral
Conditions
Brief summary
The purpose of this study is to understand the speech perception in noise and in quiet and localization benefits in a laboratory setting in listeners that receive a cochlear implant in an ear with severe to profound hearing loss and have normal, or near-normal hearing in the opposite ear. We will also evaluate the functional benefit of restoring hearing to the impaired ear via questionnaires that subjects will be answering while listening in their natural environment.
Interventions
DEVICECochlear Implant
adults with unilateral hearing loss who wish to regain bilateral hearing will be implanted with a cochlear implant on their deafened ear.
Sponsors
University of Iowa
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
1. Participants will be adults who utilize English as their primary language. 2. Unilateral severe to profound sensorineural hearing loss for a duration of at least 6 months (to ensure stability of hearing loss), but no greater than 10 years. 3. Contralateral ear with normal, or near-normal, hearing. 4. Poorer ear (ear to be implanted): severe to profound sensorineural hearing loss, defined as pure-tone thresholds 70 dB HL or greater for the frequencies 500, 1000, 2000, 3000, and 4000 Hz with monosyllabic word understanding, as measured using the CNC Word Test at 60 dBA under earphones, less than or equal to 20% 5. Better ear (contralateral ear): normal or near-normal hearing defined as pure-tone thresholds no poorer than 30 dB HL at 250, 500, 1000, 2000, and 3000 Hz and no poorer than 40 dB HL at 4000 Hz with monosyllabic word understanding, as measured using the CNC Word Test at 60 dBA under earphones, of greater than or equal to 85%. 6. Willingness to comply with all study requirements. 7. Patent cochlea and normal cochlear anatomy.
Exclusion criteria
1. Medical or psychological conditions that contraindicate undergoing surgery. 2. Ossification or any other cochlear anomaly that might prevent complete insertion of the electrode array. 3. Unrealistic expectations on the part of the candidate and/or candidate's family, regarding the possible benefits, risks, and limitations that are inherent to the surgical procedure(s) and prosthetic devices. 4. Unwillingness or inability of the candidate to comply with all investigational requirements. 5. Active middle ear infection. 6. Tinnitus primary motivation for implantation.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in AzBio Sentences in Noise | Pre-operative baseline, 3, 6, 12 months post-activation | The percent correct of words from a list of 20 Target AzBio sentences will be played from 0° azimuth. A list of AzBio sentences will be played in multitalker babble which will be presented in three different conditions: 0° azimuth, S0N90, or S0N270°. |
| Change in Localization | Pre-operative baseline, 3, 6, 12 months post-activation | Testing with 16 sounds played randomly from 1 of 8 loudspeakers in a 108 degree arc will be completed with non-implanted ear alone and everyday listening condition at 60 dBA. Subjects will be asked to identify which loudspeaker presented the sound. The RMS error in degrees will be calculated. A lower number indicates better localization ability. |
Countries
United States
Outcome results
None listed