Benefits of a contralateral routing of signal device for unilateral Naída CI cochlear implant recipients
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Many bilaterally deaf adults are only able to receive one cochlear implant (CI), resulting in suboptimal listening performance, especially in challenging listening environments. Adding a contralateral routing of signal (CROS) device to a unilateral CI is one possibility to alleviate these challenges. This study examined the benefit of such a CROS device.
Thirteen adult subjects with at least 6 months of CI use, and no or limited benefit of a hearing instrument in the contralateral ear were included in the study. The perceived benefit of a CROS device in everyday listening environments was evaluated up to 1 year after initial fitting using several questionnaires. Speech intelligibility performance was determined using the French matrix sentence test in quiet and in two speech-in-noise setups and was followed for 3 months after CROS fitting.
Subjects indicated high satisfaction with the practical usability of the CROS device and long-term device retention was high. Perceived benefits in everyday listening environments were reported. Formal speech intelligibility tests revealed statistically significant median improvements of 6.93 dB SPL (Wilcoxon Z = 2.380, p = 0.017) in quiet and up to 8.00 dB SNR (Wilcoxon Z = 2.366, p = 0.018) in noise. These benefits were accessible immediately without a need for prolonged acclimatization.
Subjective satisfaction and device retention as well as speech intelligibility benefits in quiet and in noise prove the CROS device to be a valuable addition to a unilateral CI in cases of bilateral deafness where bilateral implantation is not an option.
KeywordsCochlear implantation CROS Binaurality Speech intelligibility Subjective benefit
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
All study procedures were approved by the ethical committee, ‘Comité de Protection des Personnes Sud-Est V’ and the French competent authority, ANSM (Agence Nationale de Sécurité du Médicament et des produits de santé) and were conducted in accordance with the ethical standards defined by the Declaration of Helsinki. The study was registered as N° NCT03078920 at https://www.clinicaltrials.gov.
Informed consent was obtained from all individual participants included in the study.
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