Isabelle Mosnier1,2,3, Ghizlene Lahlou4,5, Jonathan Flament6,7, Nathalie Mathias8, Evelyne Ferrary6,4, Olivier Sterkers6,4, Daniele Bernardeschi6,4, Yann Nguyen6,4. 1. Sorbonne Université, Inserm, Unité de Réhabilitation chirurgicale mini-invasive robotisée de l'audition, Paris, France. isabelle.mosnier@aphp.fr. 2. AP-HP, GHU Pitié-Salpêtrière, Service ORL, Otologie, Implants auditifs et chirurgie de la base du crâne, Paris, France. isabelle.mosnier@aphp.fr. 3. Unité Otologie, Implants auditifs et Chirurgie de la base du crâne, GH Pitié-Salpêtrière-Bâtiment Castaigne, 47-83 Boulevard de l'Hôpital, 75651, Paris Cedex 13, France. isabelle.mosnier@aphp.fr. 4. AP-HP, GHU Pitié-Salpêtrière, Service ORL, Otologie, Implants auditifs et chirurgie de la base du crâne, Paris, France. 5. Sorbonne Université, Institut Pasteur, Inserm, Unité de génétique et de physiologie de l'Audition, Paris, France. 6. Sorbonne Université, Inserm, Unité de Réhabilitation chirurgicale mini-invasive robotisée de l'audition, Paris, France. 7. Laboratoire Audika, Paris, France. 8. Advanced Bionics, Bron, France.
Abstract
PURPOSE: 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. METHODS: 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. RESULTS: 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. CONCLUSIONS: 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.
PURPOSE: 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. METHODS: 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. RESULTS: 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. CONCLUSIONS: 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.
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