Introduction: In this study which was achieved at Izmir Bozyaka Teaching and Research Hospital, identifying the sensitivity
and reliability of round window electrocochleographic records on children during cochlear implantation and investigating the
applicability of the method on particularly problematic patient groups was aimed.
Material and Methods: In this study, the golf-club electrode was placed on the round window niche during cochlear implantation
of 30 patients after posterior tympanotomy. Then click stimulus was given by TDH 39 headphones over the speculum which was
placed in the external ear canal and the responses that obtained from the stimuli were recorded with Medelec Snergy Amplifier
device. The round window ECoG records which were obtained from these 30 patients were compared with the preoperative ABR
results. Round window ECoG responses were acquired during operation in 22 patients who had no response to ABR preoperatively.
Two patients responded to both preoperative ABR and perioperative round window ECoG. And 7 patients had no preoperative ABR
and perioperative round window ECoG responses.
Discussion: Our outcome data shows that round window ECoG is more sensitive than ABR while deciding for cochlear
implantation. The results are statistically significant. Outside of the study, there were 8 patients more. These 8 patients had some
abnormalities and because of these abnormalities it was difficult for us to decide for cochlear implantation. We performed round
window ECoG to these 8 patients via trans canal way. In these patients we again found that round window ECoG is more sensitive
than ABR for determination of residual hearing and it can be a guiding test for us to decide for cochlear implantation in patients
Conclusion: As a result, round window ECoG is a very sensitive method for determination of residual hearing and it might be
used in patients who has abnormalities such as bony labyrinth abnormalities, auditory neuropathy, and meatus acousticus internus
stenosis that complicates our decision for cochlear implantation.