Delayed sequellae after cochlear implantation: cases reports
Objective of research. Improvement of methods of surgical stage of cochlear implantation by analysis of clinical findings on the wrong administration of the active electrode into the spiral canal of the cochlea and the definition of treatment tactics in these patients.Materials and methods. During the period from 2014 to 2016 in the Federal Research Clinical Center of Otorhinolaryngology of Federal Medical Biological Agency of Russia, Hospital of the Ministry of Internal affairs of Azerbaijan Republic named after A. Heydarov under the program of cochlear implantation 920 patients aged between 8 months and 24 years were examined and operated. Results. 4 cases of improper administration of the active electrode into the cochlea have been revealed. Out of these, 3 cases were revealed in children aged 3-6 years with ossification of inner ear, and 1 case of active electrode extrusion was revealed in 13-year-old patient with a normal anatomy of the temporal bone. It requires repeated surgery in all 4 cases. Conclusion. Improper positioning of the electrode array should be included in the differential diagnosis when patients do not have hearing improvement even several years after implantation. Extracochlear active electrode displacement is an infrequent complication, the published literature incidence rate an average of 0.37% [16]. However, this range is likely underestimated, and the true incidence may remain unknown until the creation of universal centralized database for recording of such cases. In most of these cases described in the literature and in this study tactics for treatment are explantation and reimplantation.