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Review
. 2008 Aug;242(1-2):164-71.
doi: 10.1016/j.heares.2007.11.008. Epub 2007 Nov 29.

Combined acoustic and electric hearing: preserving residual acoustic hearing

Christopher W Turner  1 , Lina A J Reiss, Bruce J Gantz
Affiliations
Review

Combined acoustic and electric hearing: preserving residual acoustic hearing

Christopher W Turner et al. Hear Res. 2008 Aug.

Abstract

The topic of this review is the strategy of preserving residual acoustic hearing in the implanted ear to provide combined electrical stimulation and acoustic hearing as a rehabilitative strategy for sensorineural hearing loss. This chapter will concentrate on research done with the Iowa/Nucleus 10 mm Hybrid device, but we will also attempt to summarize strategies and results from other groups around the world who use slightly different approaches. A number of studies have shown that preserving residual acoustic hearing in the implanted ear is a realistic goal for many patients with severe high-frequency hearing loss. The addition of the electric stimulation to their existing acoustic hearing can provide increased speech recognition for these patients. In addition, the preserved acoustic hearing can offer considerable advantages, as compared to a traditional cochlear implant, for tasks such as speech recognition in backgrounds or appreciation of music and other situations where the poor frequency resolution of electric stimulation has been a disadvantage.

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Figures

Figure 1
Figure 1
The signal-to-noise ratio (in dB) for 50%-correct recognition of spondee words in competing backgrounds of steady noise or competing talkers. Subjects are sorted according to degree of hearing loss (average of 500, 1000 and 2000 Hz) and also if they are listening through a traditional long-electrode cochlear implant. Figure reprinted with permission (Turner. C.W.; Audiol Neurotol; 2006; 11:2–5) courtesy of S Karger AG, Basel.
Figure 2
Figure 2
Distribution of SRT (signal-to-noise ratios) values for the Hybrid group and the smaller, matched long-electrode group. From Turner et al. (2007).
Figure 3
Figure 3
SRT (signal-to-noise ratios) for the recognition of spondees in competing talkers as a function of the low-frequency average pure-tone thresholds. The two dashed lines at the top represent the average long-electrode SRT values for the large, unselected group (n-=20) and the smaller, matched group (n=11). Open symbols represent the subjects who lost residual hearing. From Turner et al. (2007).
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