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The cochlear implant is a technical and surgical creation, being the first direct connection between the brain and an electronic device, opening new perspectives in the field of neurobiology. The purpose of the study was to investigate the variations in the impedance values of intraohlear electrodes in implanted patients, taking measurements in three different stages: intraoperatively, upon activation of the cochlear implant (1 month after surgery) and to the first fitting after activation. This study is a retrospective view on patients who underwent implantation of a cochlear implant. The general objective of this paper, what we are focusing on, will show the change in impedance measurement before and after nerve stimulation, meaning during the operation, at the time of device activation and at the first fitting. This monitors the function of- and the healing process around the electrode which reflects the success rate. This may show that continuous electrical stimulation and repeated measurement of electrical is important for sufficient setting and functioning of the complete device and each electrode, and might be beneficial as not only a diagnostic or monitoring, but also as a therapeutic tool in cochlear implantation and fitting process. [ABSTRACT FROM AUTHOR]