Summary of Results Using the Nucleus CI24M Implant to Record the Electrically Evoked Compound Action Potential

Abbas, Paul J.; Brown, Carolyn J.; Shallop, Jon K.; Firszt, Jill B.; Hughes, Michelle L.; Hong, Sung Hwa; Staller, Steven J.

doi:10.1097/00003446-199902000-00005

Cited by 278 publications

(253 citation statements)

References 18 publications

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“…The parameters that were applied in recording the neural response were taken from published recommendations [14][15][16] . ECAP threshold measurements were taken at the 80 and 35Hz stimulation frequencies to assess possible changes in the characteristics of the neural response as the stimulation frequency is reduced.…”

Section: Methodsmentioning

confidence: 99%

Auditory neuropathy/auditory dyssynchrony in children with cochlear implants

Carvalho¹,

Bevilácqua²,

Sameshima³

et al. 2011

Braz. j. otorhinolaryngol. (Impr.)

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The electrical stimulation generated by the Cochlear Implant (CI) may improve the neural synchrony and hence contribute to the development of auditory skills in patients with Auditory Neuropathy / Auditory Dyssynchrony (AN/AD). Aim Prospective cohort cross-sectional study to evaluate the auditory performance and the characteristics of the electrically evoked compound action potential (ECAP) in 18 children with AN/AD and cochlear implants. Material and methods The auditory perception was evaluated by sound field thresholds and speech perception tests. To evaluate ECAP's characteristics, the threshold and amplitude of neural response were evaluated at 80Hz and 35Hz. Results No significant statistical difference was found concerning the development of auditory skills. The ECAP's characteristics differences at 80 and 35Hz stimulation rate were also not statistically significant. Conclusion The CI was seen as an efficient resource to develop auditory skills in 94% of the AN/ AD patients studied. The auditory perception benefits and the possibility to measure ECAP showed that the electrical stimulation could compensate for the neural dyssynchrony caused by the AN/AD. However, a unique clinical procedure cannot be proposed at this point. Therefore, a careful and complete evaluation of each AN/AD patient before recommending a Cochlear Implant is advised. Clinical Trials : NCT01023932

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Section: Methodsmentioning

confidence: 99%

Auditory neuropathy/auditory dyssynchrony in children with cochlear implants

Carvalho¹,

Bevilácqua²,

Sameshima³

et al. 2011

Braz. j. otorhinolaryngol. (Impr.)

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“…Telemetry also supported the world's first recording of the ECAP using the intracochlear electrodes via NRT. 21 Neural response telemetry can be used to assist in device fitting [22][23][24] and can be very helpful in fitting young children 25 and others who do not give reliable behavioral responses. It has been shown that NRT-based fitting procedures are quicker than behaviorally based methods in young children, with similar aided thresholds and speech detection scores for the 2 methods.…”

Section: The Nucleus Ci24m Systemmentioning

confidence: 99%

The Development of the Nucleus^® Freedom™ Cochlear Implant System

Patrick

Busby

Gibson

2006

Trends in Amplification

175

128

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Cochlear Limited (Cochlear™) released the fourth-generation cochlear implant system, Nucleus® Freedom™, in 2005. Freedom is based on 25 years of experience in cochlear implant research and development and incorporates advances in medicine, implantable materials, electronic technology, and sound coding. This article presents the development of Cochlear's implant systems, with an overview of the first 3 generations, and details of the Freedom system: the CI24RE receiver-stimulator, the Contour Advance™ electrode, the modular Freedom processor, the available speech coding strategies, the input processing options of SmartSound™ to improve the signal before coding as electrical signals, and the programming software. Preliminary results from multicenter studies with the Freedom system are reported, demonstrating better levels of performance compared with the previous systems. The final section presents the most recent implant reliability data, with the early findings at 18 months showing improved reliability of the Freedom implant compared with the earlier Nucleus 3 System. Also reported are some of the findings of Cochlear's collaborative research programs to improve recipient outcomes. Included are studies showing the benefits from bilateral implants, electroacoustic stimulation using an ipsilateral and/or contralateral hearing aid, advanced speech coding, and streamlined speech processor programming.

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“…In case the action potential could not be observed in any of these electrodes, other adjacent pairs were used as active and reference electrodes for the optimization series, until some positive response could be observed. We considered it absence of intraoperative NRT when we did not observe ECAP in any of the tested electrode pairs, considering as bases the characteristics described by Abbas et al 15 . The maximum intensity used in the test was of 230 current levels.…”

Section: Action Potential Studymentioning

confidence: 99%

“…Obtaining data related to the cochlear nerve's permeability towards electrical stimulation and the way through which some electrical stimulation parameters interact with remaining neural structures still constitutes a challenge. Early determination of exciting neural elements present in the different cochlear pathological processes would also be very useful, since it is supposed that the survival of ganglion cells and other neural elements may constitute one of the causes for variability in relation to speech recognition performance found in implanted individuals 3,15 .…”

Section: Introductionmentioning

confidence: 99%

Efeitos do potencial de ação neural sobre a percepção de fala em usuários de implante coclear

Guedes

Weber

Goffi-Gómez

et al. 2007

Rev. Bras. Otorrinolaringol.

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El ectrically Evoked Compound Action Potential is a measure of synchronous cochlear nerve fibers activity elicited by electrical stimulation of the cochlear implant. The electrophysiological nerve responses may contribute to explain the variability in individual performance of cochlear implant recipients. Aim: To compare speech perception tests' performances of cochlear implant users according to the presence or absence of intraoperative neural telemetry responses. Material and Method: Prospective study design with 100 "Nucleus 24" cochlear implant users divided in two groups according to the presence or absence of intraoperative neural telemetry responses. Speech perception tests were performed after 6 months of continuous use of the device and compared among groups. Results: Intraoperative action potentials were observed in 72 % of individuals. Open-set sentence test results were better in implant users who had neural telemetry responses when compared to implant users in whom this potential was absent (averages 82.8 % versus 41 %, p = 0.005). There was a strong association between post meningitis-related deafness and absence of intraoperative potentials. Conclusion: The absence of intraoperative neural telemetry responses was associated with worse performances in speech perception tests and meningitis as etiology of deafness. On the other hand, the presence of these potentials suggests excellent prognosis.

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Summary of Results Using the Nucleus CI24M Implant to Record the Electrically Evoked Compound Action Potential

Cited by 278 publications

References 18 publications

Auditory neuropathy/auditory dyssynchrony in children with cochlear implants

Auditory neuropathy/auditory dyssynchrony in children with cochlear implants

The Development of the Nucleus^® Freedom™ Cochlear Implant System

Efeitos do potencial de ação neural sobre a percepção de fala em usuários de implante coclear

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Summary of Results Using the Nucleus CI24M Implant to Record the Electrically Evoked Compound Action Potential

Cited by 278 publications

References 18 publications

Auditory neuropathy/auditory dyssynchrony in children with cochlear implants

Auditory neuropathy/auditory dyssynchrony in children with cochlear implants

The Development of the Nucleus® Freedom™ Cochlear Implant System

Efeitos do potencial de ação neural sobre a percepção de fala em usuários de implante coclear

Contact Info

Product

Resources

About

The Development of the Nucleus^® Freedom™ Cochlear Implant System