Mohsen Rajati1, Mohammad Mehdi Ghassemi2, Mehdi Bakhshaee3, Mohammad Reza Tale4, Hamid Tayarani4. 1. Otorhinolaryngology Department, Ghaem Educational Hospital, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. 2. The Sinus and Endoscopic Surgery Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. 3. The Sinus and Endoscopic Surgery Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. Electronic address: mehbakhsh@yahoo.com. 4. Khorasan Cochlear Implant Centre, Mashhad, Iran.
Abstract
OBJECTIVE: The purpose of this study was to analyze changes in neural response telemetry (NRT) and electrically evoked stapedial reflex thresholds (ESRT) before and after stylet withdrawal during cochlear implant surgery. METHODS: Thirty children (21-92 months old) who were candidates for cochlear implantation took part in this study. In all of them Nucleus Contour Advance was implanted. NRT and ESRT responses were recorded initially with the stylet in and then when the stylet was taken out during the implant procedure. The recordings were performed in the basal, middle, and apical areas of the electrode array. RESULTS: The threshold levels required to obtain NRT and ESRT responses after stylet removal were lower. This decrease was observed in all parts of the cochlea. It was statistically significant in all areas with the exception of the basal ESRT measurements. CONCLUSION: Withdrawing the stylet results in better NRT and ESRT responses, most probably due to a favorable position change of the electrode array within the scala tympani.
OBJECTIVE: The purpose of this study was to analyze changes in neural response telemetry (NRT) and electrically evoked stapedial reflex thresholds (ESRT) before and after stylet withdrawal during cochlear implant surgery. METHODS: Thirty children (21-92 months old) who were candidates for cochlear implantation took part in this study. In all of them Nucleus Contour Advance was implanted. NRT and ESRT responses were recorded initially with the stylet in and then when the stylet was taken out during the implant procedure. The recordings were performed in the basal, middle, and apical areas of the electrode array. RESULTS: The threshold levels required to obtain NRT and ESRT responses after stylet removal were lower. This decrease was observed in all parts of the cochlea. It was statistically significant in all areas with the exception of the basal ESRT measurements. CONCLUSION: Withdrawing the stylet results in better NRT and ESRT responses, most probably due to a favorable position change of the electrode array within the scala tympani.
Authors: A Perenyi; F Toth; B Dimak; R Nagy; P Schoerg; J Jori; J G Kiss; G Sprinzl; M Csanady; L Rovo Journal: J Otolaryngol Head Neck Surg Date: 2019-09-06