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Contralateral Routing of Signal Yields Significant Speech in Noise Benefit for Unilateral Cochlear Implant Recipients
Robert T Dwyer1, David Kessler1, Iliza M Butera2
1Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN.
Journal of the American Academy of Audiology
|November 22, 2018
Summary
Contralateral routing of signal (CROS) devices offer significant speech understanding improvements for unilateral cochlear implant (CI) users. This technology provides objective and subjective benefits for those unable to access bilateral CI.
Area of Science:
- Audiology
- Biomedical Engineering
- Otoacoustic Emissions
Background:
- Bilateral cochlear implantation is standard for severe hearing loss.
- Some patients cannot receive a second cochlear implant (CI) due to various reasons.
- This study evaluates a solution for unilateral CI recipients without contralateral hearing aid or CI use.
Purpose of the Study:
- To investigate the benefits of adding a contralateral routing of signal (CROS) device.
- To assess objective and subjective benefits in adult CI recipients with hearing loss in the non-implanted ear.
Main Methods:
- A single-center prospective study with a within-subjects repeated-measures design.
- Ten unilateral CI recipients with hearing loss in the non-implanted ear participated.
- Participants were tested with and without a CROS device in acute listening conditions.
Main Results:
- An 11% improvement in speech understanding in noise was observed with the CROS device.
- Speech understanding improved when the speech source was at 0° azimuth.
- Subjective benefits were reported in the speech domain of the SSQ questionnaire.
Conclusions:
- Contralateral routing of signal (CROS) devices offer significant benefits for unilateral CI recipients.
- Both objective and subjective improvements in speech recognition were noted.
- CROS devices provide a viable solution for those without bilateral cochlear implantation access.
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