Hearing Preservation Cochlear Implants: A Review of Potential Mechanisms of Hearing Loss After Implantation Hearing preservation cochlear implants (CIs) are specifically designed to preserve residual low-frequency acoustic hearing for use together with electrically stimulated high-frequency hearing. This combined electro-acoustic stimulation (EAS) provides a promising treatment option for patients with severe high-frequency hearing loss, but with some residual low-frequency hearing, and has been shown to ... Article
Article  |   October 16, 2017
Hearing Preservation Cochlear Implants: A Review of Potential Mechanisms of Hearing Loss After Implantation
Author Affiliations & Notes
  • Conor Kelly
    Department of Otolaryngology, Oregon Health and Sciences University, Portland, OR
    Medical College of Georgia, Augusta University, Augusta, GA
  • Lina A. J. Reiss
    Department of Otolaryngology, Oregon Health and Sciences University, Portland, OR
  • Disclosures
    Disclosures ×
  • Financial: Conor Kelly has no relevant financial interests to disclose. Lina A. J. Reiss has no relevant financial interests to disclose.
    Financial: Conor Kelly has no relevant financial interests to disclose. Lina A. J. Reiss has no relevant financial interests to disclose.×
  • Nonfinancial: Conor Kelly has no relevant nonfinancial interests to disclose. Lina A. J. Reiss has no relevant nonfinancial interests to disclose.
    Nonfinancial: Conor Kelly has no relevant nonfinancial interests to disclose. Lina A. J. Reiss has no relevant nonfinancial interests to disclose.×
Article Information
Hearing & Speech Perception / Hearing Disorders / Hearing Aids, Cochlear Implants & Assistive Technology / Part 2
Article   |   October 16, 2017
Hearing Preservation Cochlear Implants: A Review of Potential Mechanisms of Hearing Loss After Implantation
Perspectives of the ASHA Special Interest Groups, October 2017, Vol. 2, 54-63. doi:10.1044/persp2.SIG6.54
History: Received August 11, 2017 , Revised September 2, 2017 , Accepted September 5, 2017
Perspectives of the ASHA Special Interest Groups, October 2017, Vol. 2, 54-63. doi:10.1044/persp2.SIG6.54
History: Received August 11, 2017; Revised September 2, 2017; Accepted September 5, 2017

Hearing preservation cochlear implants (CIs) are specifically designed to preserve residual low-frequency acoustic hearing for use together with electrically stimulated high-frequency hearing. This combined electro-acoustic stimulation (EAS) provides a promising treatment option for patients with severe high-frequency hearing loss, but with some residual low-frequency hearing, and has been shown to improve speech perception, especially in background noise, music perception, and sound source localization. Thus, preservation of residual hearing should be a priority in treatment.

Although residual low-frequency hearing is successfully preserved to varying degrees in many patients, some patients experience a loss of residual hearing following implantation. A wide range of potential causes of, or contributors to, loss of residual hearing in EAS CI users have been proposed. In this paper, we review the evidence for several of the proposed causes of hearing loss with EAS CI. We conclude that its etiology is likely a multifactorial, heterogeneous phenomenon. Furthermore, we suggest that studies to further elucidate effects of ischemia on lateral wall function and maintenance of endocochlear potential in the context of EAS CI implantation and use are needed.

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