Document Detail

The use of frequency compression by cochlear implant recipients with postoperative acoustic hearing.
MedLine Citation:
PMID:  20701835     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The number of cochlear implant (CI) recipients who have usable acoustic hearing in at least one ear is continuing to grow. Many such CI users gain perceptual benefits from the simultaneous use of acoustic and electric hearing. In particular, it has been shown previously that use of an acoustic hearing aid (HA) with a CI can often improve speech understanding in noise. PURPOSE: To determine whether the application of frequency compression in an HA would provide perceptual benefits to CI recipients with usable acoustic hearing, either when used in combination with the CI or when the HA was used by itself. RESEARCH DESIGN: A repeated-measures experimental design was used to evaluate the effects on speech perception of using a CI either alone or simultaneously with an HA that had frequency compression either enabled or disabled. STUDY SAMPLE: Eight adult CI recipients who were successful users of acoustic hearing aids in their nonimplanted ears participated as subjects. INTERVENTION: The speech perception of each subject was assessed in seven conditions. These required each subject to listen with (1) their own HA alone; (2) the Phonak Naida HA with frequency compression (SoundRecover) enabled; (3) the Naida with SoundRecover disabled; (4) their CI alone; (5) their CI and their own HA; (6) their CI and the Naida with SoundRecover enabled; and (7) their CI and the Naida with SoundRecover disabled. Test sessions were scheduled over a period of about 10 wk. During part of that time, the subjects were asked to use the Phonak Naida HA with their CIs in place of their own HAs. DATA COLLECTION AND ANALYSIS: The speech perception tests included measures of consonant identification from a closed set of 12 items presented in quiet, and measures of sentence understanding in babble noise. The speech materials were presented at an average level of 60 dB SPL from a loudspeaker. RESULTS: Speech perception was better, on average, in all conditions that included use of the CI in comparison with any condition in which only an HA was used. For example, consonant recognition improved by approximately 50 percentage points, on average, between the HA-alone listening conditions and the CI-alone condition. There were no statistically significant score differences between conditions with SoundRecover enabled and disabled. There was a small but significant improvement in the average signal-to-noise ratio (SNR) required to understand 50% of the words in the sentences presented in noise when an HA was used simultaneously with the CI. CONCLUSIONS: Although each of these CI users readily accepted the Phonak Naida HA with SoundRecover frequency compression, no benefits related specifically to the use of SoundRecover were found in the particular tests of speech understanding applied in this study. The relatively high levels of perceptual performance attained by these subjects with use of a CI by itself are consistent with the finding that the addition of an HA provided little further benefit. However, the use of an HA with the CI did provide better performance than the CI alone for understanding sentences in noise.
Hugh McDermott; Katherine Henshall
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the American Academy of Audiology     Volume:  21     ISSN:  1050-0545     ISO Abbreviation:  J Am Acad Audiol     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-08-12     Completed Date:  2010-09-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9114646     Medline TA:  J Am Acad Audiol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  380-9     Citation Subset:  IM    
Copyright Information:
American Academy of Audiology.
Department of Otolaryngology, University of Melbourne, Australia.
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MeSH Terms
Aged, 80 and over
Cochlear Implants*
Combined Modality Therapy
Deafness / rehabilitation*
Hearing Aids*
Middle Aged
Perceptual Masking
Prosthesis Design
Sound Spectrography
Speech Discrimination Tests*
Speech Reception Threshold Test*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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