Artikel
Electric Response Audiometry in Adult Patients Prior to Cochlear Implantation
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Veröffentlicht: | 31. Mai 2005 |
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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.