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Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants

Medical University of Hannover

01.06. bis 04.06.2005, Hannover

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Paediatric results of correlation between neural response imaging (NRI) and most comfortable levels

Meeting Abstract

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  • corresponding author G. Sennaroglu - Hacettepe University Hospital, Audiology and Speech Disorders Clinic, Ankara
  • B. Budak - Hacettepe University Hospital, Audiology and Speech Disorders Clinic, Ankara
  • E. Yücel - Hacettepe University Hospital, Audiology and Speech Disorders Clinic, Ankara
  • H. Dincer - Hacettepe University, Department of Educational Audiology, Ankara
  • E. Belgin - Hacettepe University Hospital, Audiology and Speech Disorders Clinic, Ankara

Medical University of Hannover, Department of Otolaryngology. Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants. Hannover, 01.-04.06.2005. Düsseldorf, Köln: German Medical Science; 2005. Doc05omci047

The electronic version of this article is the complete one and can be found online at: http://www.egms.de/en/meetings/omci2005/05omci047.shtml

Published: May 31, 2005

© 2005 Sennaroglu et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.en). You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.

Outline

Text

Introduction

To investigate the correlation between intra-operative Neural Response Imaging (NRI) recordings and Most Comfortable levels (M levels) in paediatric users.

Materials and Methods

10 subjects, implanted with a CII Bionic Ear® or a HiRes 90KTM, participated in the study. NRI responses- generated as a result of the electrical stimulation of the cochlea through the cochlear implant- were measured intra-operatively at apical, medial and basal locations within the cochlea. Stimulating electrodes were 3, 9 and 15 and recording electrodes were 1, 7, and 13 respectively. In case of insertion depth, non-auditory stimulation, electrode impedance or integrity issues, the nearest appropriate electrode was used. Behavioral M levels were measured at first fitting and at the following post-first fitting intervals: 3 months, 6 months, and 12 months. M levels were measured by using the default automatic settings of the SoundWave® fittting software- fully sequential, 16 channels, narrowest possible pulse width. Correlation between NRI responses and M levels was examined; both initial fitting levels and more stable program levels reached after 6 months of implant use were considered for the correlation.

Results

Findings about the correlation between NRI thresholds and behavioral M levels will be presented. Preliminary results show that intra-operative tNRI is 83% of first fitting M levels and 61% of stable M levels.

Conclusions

Results show that NRI is a useful and practical objective tool: it can be used for paediatric fitting if it is difficult to obtain user feedback and the recordings can be easily performed intra-operatively during the flap closure without lengthening the operating time.