gms | German Medical Science

Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants

Medical University of Hannover

01.06. bis 04.06.2005, Hannover

Electric Response Audiometry in Adult Patients Prior to Cochlear Implantation

Meeting Abstract

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  • corresponding author S. Mason - Nottingham Cochlear Implant Programme, Queen's Medical Centre, Nottingham
  • M. Loveland - Department of Otolaryngology, Queen's Medical Centre, Nottingham
  • Y. James - Nottingham Cochlear Implant Programme, Queen's Medical Centre, Nottingham
  • K. Gibbin - Department of Otolaryngology, Queen's Medical Centre, Nottingham

Medical University of Hannover, Department of Otolaryngology. Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants. Hannover, 01.-04.06.2005. Düsseldorf, Köln: German Medical Science; 2005. Doc05omci005

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Veröffentlicht: 31. Mai 2005

© 2005 Mason et al.
Dieser Artikel ist ein Open Access-Artikel und steht unter den Creative Commons Lizenzbedingungen (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.de). Er darf vervielf&aauml;ltigt, verbreitet und &oauml;ffentlich zug&aauml;nglich gemacht werden, vorausgesetzt dass Autor und Quelle genannt werden.


Gliederung

Text

Introduction

In the Nottingham Cochlear Implant Programme (NCIP), Electric Response Audiometry (ERA) employing the Auditory Cortical Response (ACR) and Auditory Brainstem Response (ABR) is currently performed on all adult patients as part of their audiological assessment prior to proceeding with cochlear implantation. An audit of these recordings was carried out in 40 consecutive adult patients

Materials and Methods

Recordings of the ACR were acquired on each ear using air-conducted 1kHz and 4kHz tone burst stimuli with maximum stimulus levels of 120dBHL.

Results

Analysis of the ACR thresholds with respect to the pure tone audiogram (PTA) showed that there were 13 thresholds in 8 patients where the ACR threshold was better than the PTA by more than 10dB. Out of these 8 patients only 4 (50%) went ahead with cochlear implantation, compared with implantation of 22 (69%) in the remaining 32 patients. The click-evoked ABR was recorded for assessment of hearing threshold and as an oto-neurological investigation. The ABR threshold was better than the ACR threshold by more than 10dB in 9 patients and a delayed I-V interval was identified in one patient.

Conclusions

Electric Response Audiometry (ERA) can provide valuable information to assist with the decision of whether or not to proceed with cochlear implantation. The issue of whether at least some components of ERA need to be carried out routinely or just on selected patients will be discussed.