Benefit of contralateral hearing aid in adult cochlear implant bearers - 10/06/16

Doi : 10.1016/j.anorl.2015.11.002

D. Bouccara ^a,^b,^⁎ , E. Blanchet ^a,^c, P.E. Waterlot ^a,^c, M. Smadja ^a,^b, B. Frachet ^a,^d, B. Meyer ^a,^b, O. Sterkers ^a,^b,^e
^a Institut francilien d’implantation cochléaire (IFIC), hôpital Rothschild, Pavillon-La-Deauvillaise, 5, rue Santerre, 75012 Paris, France
^b Otologie, implants auditifs et chirurgie de la base du crâne, groupe hospitalier de la Pitié-Salpêtrière, AP–HP, bâtiment Paul-Castaigne – 1^er étage, 50-52, boulevard Vincent-Auriol, 75013 Paris, France
^c Laboratoire de correction auditive (LCA), 20, rue Thérèse, 75001 Paris, France
^d Centre de réglage des implants cochléaires, hôpital Rothschild, AP–HP, 5, rue Santerre, 75012 Paris, France
^e UMR-S 867 Inserm/Paris 7 Denis-Diderot, « chirurgie otologique mini-invasive robotisée », 75018 Paris, France

^⁎Corresponding author. Institut francilien d’implantation cochléaire (IFIC), hôpital Rothschild, Pavillon-La-Deauvillaise, 5, rue Santerre, 75012 Paris, France.

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Abstract

Objectives

The present study assessed the interest of a contralateral hearing aid (HA) in adult cochlear implant (CI) bearers.

Material and methods

The study recruited 10 French-speaking adult HA bearers with postlingual bilateral hearing loss, fitted for at least 2 years with a unilateral CI after loss of benefit from HA in one ear but continuing to use their contralateral HA: 4 male, 6 female; mean age, 58 years. All had regularly used bilateral HAs prior to CI. Audiometric assessment comprised: (1) individual ear hearing assessment on pure-tone audiometry and speech discrimination; and (2) free-field testing without aid, with CI only, with HA only and with CI plus HA, on pure-tone audiometry and speech discrimination with quiet background and on speech discrimination in noise.

Results

Speech discrimination was significantly improved in the bimodal condition (CI plus HA) as compared to CI alone, on all tests. In quiet, discrimination for disyllabic words was>50% in 7 cases with HA alone, in 2 cases with CI alone and in 1 case in with HA+CI. Under 0dB signal-to-noise ratio, discrimination was>50% in 1 case with HA alone, in 3 cases with CI alone and in 6 cases with HA+CI.

Conclusion

The present results showed benefit in auditory perception in quiet and in noise with bimodal stimulation. When there is residual hearing in the non-implanted ear, a HA should be fitted; and in progressive bilateral hearing loss, CI should be suggested when HA benefit decreases in one ear.

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Keywords : Postlingual hearing loss, Cochlear implant, Hearing aid