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Electroacoustic verification of frequency modulation systems in cochlear implant users
Vanessa Luisa Destro Fidêncio1, Regina Tangerino de Souza Jacob1, Liége Franzini Tanamati2
1Universidade de São Paulo (USP), Faculdade de Odontologia de Bauru (FOB), Departamento de Fonoaudiologia, Bauru, SP, Brazil.
Brazilian Journal of Otorhinolaryngology
|January 18, 2018
Summary
An electroacoustic verification test effectively assesses frequency modulation (FM) systems for cochlear implants. Adjusting the FM system gain is crucial for optimal speech perception in noise for implant users.
Area of Science:
- Audiology
- Biomedical Engineering
- Speech-Language Pathology
Background:
- Frequency modulation (FM) systems enhance speech perception in noise for cochlear implant (CI) users.
- Current guidelines lack electroacoustic test recommendations for FM system fitting in CI users.
- Behavioral tests are recommended, but electroacoustic verification is needed.
Purpose of the Study:
- To perform and validate an electroacoustic verification test for FM systems.
- To assess FM system transparency with various CI speech processors.
- To establish a reliable electroacoustic evaluation protocol.
Main Methods:
- Evaluated 40 CI users (ages 5-18) with four different speech processors.
- Utilized Audioscan Verifit and specific listening check devices for electroacoustic evaluation.
- Employed the "Phrases in Noise Test" for speech perception assessment post-adjustment.
Main Results:
- Achieved electroacoustic transparency between FM systems and CIs in 85% of participants.
- Adjustments in FM gain improved transparency and speech perception in noise.
- Electroacoustic transparency correlated with improved behavioral outcomes.
Conclusions:
- The proposed electroacoustic evaluation protocol is effective for assessing FM system-CI transparency.
- Proper adjustment of speech processor and FM gain is essential for successful fitting.
- This verification method ensures optimal device performance for CI users.
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