Electric acoustic stimulation of the auditory system: results of a multi-centre investigation

Authors:
  • AOAlec Fitzgerald O'Connor
    Alec Fitzgerald O'Connor
  • CMConstantino Morera
    Constantino Morera
  • MSManuel Sainz
    Manuel Sainz
  • KVKatrien Vermeire
    Katrien Vermeire
  • SMSonelle McDonald
    Sonelle McDonald
  • LCLaura Cavallé
    Laura Cavallé
  • SHSilke Helbig
    Silke Helbig
  • JVJuan García Valdecasas
    Juan García Valdecasas
  • IAIlona Anderson
    Ilona Anderson
  • OAOliver F. Adunka
    Oliver F. Adunka
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Abstract
A high rate of hearing preservation during cochlear implantation for electric acoustic stimulation (EAS) is possible, even when surgery is conducted by a number of different surgeons. This study aimed to determine the degree of hearing preservation using surgery for EAS in a European multi-centre clinical investigation. It also aimed to demonstrate the effect of EAS in individuals with residual low frequency hearing, both on speech perception and on subjective quality of life measures. Eighteen patients with profound high frequency hearing loss were recruited in five participating European centres. Subjects were assessed based on an audiologic test battery, as well as on a subjective hearing aid benefit questionnaire. Each subject underwent attempted hearing preservation cochlear implantation using the MED-EL C40 + device with a Medium electrode. Residual ipsilateral hearing and speech discrimination abilities were assessed at defined intervals up to 12 months after the combined electric-acoustic mode was introduced. Results showed that some degree of hearing preservation was possible in 15718 patients. All subjects showed statistically significant benefit on all three speech perception tests over time. These significant benefits were also reflected in the subjective benefit outcomes.

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