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Updated: Sep 28, 2025
Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
Published on: June 21, 2024
Can the use of the CROS system provide head shadow effect contribution to unilateral Cochlear Implant Users?
Ana Cristina Hiromi Hoshino1, Maria Valéria Schmidt Goffi-Gomez1, Paola Angelica Samuel Sierra1
1Grupo de Implante Coclear, Departamento de Otorrinolaringologia, Hospital das Clínicas - HC, Faculdade de Medicina - FM, Universidade de São Paulo - USP, São Paulo (SP), Brasil.
Purpose:
The aim of this study was to evaluate the contribution of the CROS system on the head shadow effect in unilateral implant users.
Methods:
Prospective cross-sectional study, approved by the ethics committee under protocol 2.128.869. Eleven adults with post-lingual deafness users of unilateral Advanced Bionics CI were selected. Speech recognition was evaluated with recorded words presented at 65dBA at 0o azimuth and at 90o on the side contralateral to the CI, with noise at 55dBA, using CI alone and CI + CROS system. The results were analyzed using paired t-test with a 0.05 alpha.
Results:
The mean speech recognition scores were significantly better with CI + CROS in relation to the condition of CI alone (p <0.05, p <0.005 and p <0.005 respectively). In the presentation at 0o azimuth, no significant differences were found.
Conclusion:
Users of unilateral CI without useful residual hearing for the use of hearing aids or unable to undergo bilateral surgery can benefit from the CROS device for speech recognition, especially when the speech is presented on the side contralateral to the CI.
