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Preservation of cochlear structures and hearing when using the Nucleus Slim Straight (CI422) electrode in children

Published online by Cambridge University Press:  14 January 2016

H Skarzynski ,
M Matusiak ,
A Lorens ,
M Furmanek ,
A Pilka  and
P H Skarzynski
H Skarzynski*
Affiliation:
Institute of Physiology and Pathology of Hearing, Warsaw, Poland World Hearing Centre, Kajetany, Poland
M Matusiak
Affiliation:
Institute of Physiology and Pathology of Hearing, Warsaw, Poland World Hearing Centre, Kajetany, Poland
A Lorens
Affiliation:
Institute of Physiology and Pathology of Hearing, Warsaw, Poland World Hearing Centre, Kajetany, Poland
M Furmanek
Affiliation:
Institute of Physiology and Pathology of Hearing, Warsaw, Poland World Hearing Centre, Kajetany, Poland
A Pilka
Affiliation:
Institute of Physiology and Pathology of Hearing, Warsaw, Poland World Hearing Centre, Kajetany, Poland
P H Skarzynski
Affiliation:
Institute of Physiology and Pathology of Hearing, Warsaw, Poland World Hearing Centre, Kajetany, Poland Heart Failure and Cardiac Rehabilitation Department, Medical University of Warsaw, Poland Institute of Sensory Organs, Kajetany, Poland
*
Address for correspondence: Associate Prof Piotr H Skarzynski, Institute of Physiology and Pathology of Hearing, Mochnackiego 10, 02-042 Warsaw, Poland Fax: +48 22 3560367 E-mail: [email protected]
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Abstract

Objective:

In cochlear implantation, there are two crucial factors promoting hearing preservation: an atraumatic surgical approach and selection of an electrode that does not damage cochlear structures. This study aimed to evaluate hearing preservation in children implanted with the Nucleus Slim Straight (CI422) electrode.

Methods:

Nineteen children aged 6–18 years, with partial deafness, were implanted using the 6-step Skarzynski procedure. Electrode insertion depth was 20–25 mm. Hearing status was assessed with pure tone audiometry before surgery, and at 1, 5, 9, 12 and 24 months after surgery. Electrode placement was confirmed with computed tomography.

Results:

Mean hearing preservation in the study group at activation of the cochlear implant was 73 per cent (standard deviation = 37 per cent). After 24 months, it was 67 per cent (standard deviation = 45 per cent). On a categorical scale, hearing preservation was possible in 100 per cent of cases.

Conclusion:

Hearing preservation in children implanted with the Nucleus CI422 slim, straight electrode is possible even with 25 mm insertion depth, although the recommended insertion depth is 20 mm. A round window approach using a soft, straight electrode is most conducive to hearing preservation.

Keywords

Cochlear ImplantElectric StimulationAcoustic Stimulation
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 130 , Issue 4 , April 2016 , pp. 332 - 339
Copyright
Copyright © JLO (1984) Limited 2016 

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