[Electrophysiologic and other objective tests in pediatric cochlear implantation].

Various electrophysiological procedures have been developed and utilized in pediatric cochlear implant patients. During surgery and just before implantation, recording of Electrically-Evoked Auditory Brainstem Responses (EABR) by electrical stimulation via a promontory needle electrode is a useful tool to select the suitable ear for implantation in the absence of other criteria. After implantation, peroperative assessment of the Electrically-Evoked Stapedius Reflex thresholds allows an estimation of the comfort levels not to be exceeded during the first tuning sessions. Recording of Averaged Electrode Voltages (AEV) provides assurance against general device failure, and can localize defectives electrodes which will be disactivated. Finally EABR obtained by electrical stimulation via the implant is the last control showing objective auditory responses. Furthermore there is a strong correlation between EABR thresholds and behavioral thresholds which will be obtained during the first tuning session. When a device malfunction is suspected after implantation, recording of AEV and EABR are performed, and the results are compared with the preoperative data.