[The intraoperative application of neural response telemetry with the nucleus CI24M cochlear implant].
OBJECTIVE
To test device integrity and objective auditory reaction for cochlear implant patients intraoperatively.


METHODS
Our protocol for intraoperative testing of the implant device includes device electrode impedance test and neural response telemetry (NRT), which measures the electrically evoked auditory nerve compound action potentials (ECAP).


RESULTS
We completed electrode integrity tests and NRT intraoperatively on 40 patients with the Nucleus CI24M cochlear implant. We have measured normal implant function on all 40 patients and obtained ECAP results from 39 patients. Out of 33 patients with normal inner ear, typical ECAPs were recorded in 195 electrodes in all 198 testing electrodes(98.5%). In 7 patients with inner ear Mondini dysphasia, affirmative ECAP waveforms were recorded in 26 electrodes in all 42 testing electrodes. The basal electrode ECAP threshold was higher than that of the epical one.


CONCLUSIONS
The intraoperative measurements of device function and NRT are quite simple, quick and with high accuracy. Inner ear malformation is an important factor that may affect NRT results.
Yang
H
H
Department of Otorhinolaryngology, Peking Union Medical College Hospital, Beijing 100730, China.
Tang
J
J
Cao
K
K
Zhu
X
X
Wang
Y
Y
Pan
T
T
D000200:Action Potentials; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D019929:Cochlear Implantation; D003054:Cochlear Implants; D003056:Cochlear Nerve / Q000502:physiology*; D003638:Deafness / Q000601:surgery*; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D016343:Monitoring, Intraoperative; D013686:Telemetry