Round Window Electrochleography in Cochlear Implantation Volume 5 - Issue 5

Asil Ergin¹*, Mehmet Ziya Özüer² and Levent Olgun³

• ¹ENT Department, Ödemiş State Hospital, Turkey
• ²ENT Department, Acıbadem University Bodrum Hospital, Turkey
• ³ENT Department, Başkent University Zübeyde Hanım Hospital, Turkey

Received: January 11, 2021   Published: January 27, 2021

Corresponding author: Asil Ergin, ENT Department, Ödemiş State Hospital, İzmir, Turkey

DOI: 10.32474/SJO.2021.05.000223

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Abstract

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 with abnormalities.

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.

Keywords:Cochlear implantation; round window electrocochleography; auditory brainstem response (ABR)

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