ISSN 1612-3352

Editors in Chief

Prof. Dr. Claus F. Claussen, Neurootological Research Institute of the Research Society for Smell, Taste, Hearing and Equilibrium Disorders at Bad Kissingen (4-G-F). Bad Kissingen, Germany.
Dr. med. Julia M. Bergmann,
Dr. med. Guillermo O. Bertora,
Otoneuroophthalmological Neurophysiology,
Buenos Aires, Argentina.

Production Managers

Dr. med. Julia M. Bergmann,
Dr. med. Guillermo O. Bertora,
Otoneuroophthalmological Neurophysiology,
Buenos Aires, Argentina.


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Nucleus multichannel cochlear implantation in obliterated cochleas using the steenerson procedure

Abstract

Obliteration of cochlea either by fibrous or osseous tissue is not a rare occurrence in cochlear implant candidates and it was once considered a contraindication to cochlear implantation (Balkany 1987; Luxford 1987). Obliteration may occur as consequence of the pathology of meningitis, chronic otitis media, severe otosclerosis, autoimmune inner ear diseases and temporal bone traumas.
Over the past decades various techniques have been proposed in order to manage the ossified cochleas, Gantz et al. (1988), Steenerson et al. (1990), Cohen and Waltzmann (1992), Bredberg and Lindstrom (1997).
In 1990 Steenerson et al. proposed to insert the electrodes into the scala vestibuli.
It is well known that scala tympani insertion lead to achieve excellent performance.
In order to evaluate if scala vestibuli may be an alternative for placement of a cochlear implant prosthesis we report the results of scala vestibuli insertion comparing with the the postoperative performance of matched controls who had scala tympani insertion.
From 1991 to 2000, 63 patients underwent cochlear implantation at the Department of Otolaryngology of the University of Parma. Among these, 10 received scala vestibuli insertion because of scala tympani obliteration.
For the study’s purpose inclusion criteria were: 1) only full insertions either into scala tympani or scala vestibuli; 2) only postlingually deafened adults; 3) duration of deafness £ 36 months; 4) Nucleus 22 or 24 cochlear implant devices; 5) minimum follow-up of 1 year..
Among the 10 patients who underwent scala vestibuli insertion 5 sactisfied the inclusion criteria while in the group of 53 patients who had scala tympani implantation 9 were available for the study.
Speech perception for the two groups was evaluated preoperatively and postoperatively using the following measures: vowel identification, consonant identification, bisyllabic words recognition, open-set sentences recognition and common phrases comprehension.

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