Hypothesis Cochlear trauma due to electrode insertion can be detected in acoustic responses to low frequencies in an animal model with a hearing condition similar to patients using electroacoustic stimulation. Background Clinical evidence suggests that intracochlear damage during cochlear implantation negatively affects residual hearing. Recently, we demonstrated the utility of acoustically evoked potentials to detect cochlear trauma in normal hearing gerbils. Here, gerbils with noise-induced hearing loss were used to investigate the effects of remote trauma on residual hearing. Methods Gerbils underwent high-pass (4 kHz cutoff) noise exposure to produce sloping hearing loss. After one-month recovery, each animal’s hearing loss was determined from ABRs and baseline intracochlear recording of the cochlear microphonic (CM) and compound action potential (CAP) obtained at the round window. Subsequently, electrode insertions were performed to produce basal trauma while the acoustically generated potentials to a 1 kHz tone burst were recorded after each step of electrode advancement. Hair cell counts were made to characterize the noise damage and cochlear whole mounts were used to identify cochlear trauma due to the electrode. Results The noise exposure paradigm produced a pattern of hair cell, ABR and intracochlear potential losses that closely mimicked that of EAS patients. Trauma in the basal turn, in the 15 – 30 kHz portion of the deafened region, remote from preserved hair cells, induced a decline in intracochlear acoustic responses to the hearing preserved frequency of 1 kHz. Conclusions The results indicate that a recording algorithm based on physiological markers to low frequency acoustic stimuli can identify cochlear trauma during implantation. Future work will focus on translating these results for use with current cochlear implant technology in humans.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.