2022/08/26 by Dziemba, Oliver C., Hocke, Thomas, Müller, Alexander
#EABR #Medicine and health #clinical routine #cochlear implant #electrically evoked brainstem responses #reference values
paper · doi:10.3205/zaud000023
Measurements of electrically evoked potentials of the auditory system (EAEP) are important cornerstones of objective diagnostics in cochlear implant care. For differential diagnosis, the combined evaluation of electrically evoked compound action potentials (ECAP) and electrically evoked brainstem responses (EABR) can be used. The aim of this case series is to compare measurements from difficult cases to previously published reference values of ECAP and EABR. The reference values for ECAP and EABR were determined using a broadband stimulus on 20 CI patients with normal speech recognition scores. Five cases of EAEP measurements from clinical routine will be presented and discussed in comparison to the reference values. For both ECAP and EABR, reference values of amplitude growth functions, absolute latencies and latency differences were obtained. The following cases are shown in comparison to the reference values: Normal findings; EABR at initial CI fitting; Extended latencies; Objective evaluation before re-implantation; Unexpected insufficient speech perception. Based on the reference values, a comprehensive differential diagnosis of the peripheral auditory system is possible.