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Long-term follow-up of cochlear implant users with ossified cochlea
B T Trinh1, F Bergeron, P Ferron
1Centre Hospitalier Universitaire de Québec, Pavillon Hôtel-Dieu de Québec. Québec.
Objective:
Cochlear implantation surgery in ossified cochlea is a challenge, even for the experienced otologist. Short-term assessments of auditory perception show that implantation in partial or even extensive ossified cochlea could be achieved with varying success, but no long-term follow-up results have been published yet.
Design And Methods:
This paper proposes a retrospective review of eight Nucleus cochlear implant users with ossified cochlea who have been followed on a 12- to 60-month period.
Main Outcome Measure:
Auditory performances of users are reported at each control on a scale of 100 units divided into 4 skill zones of 25 units based on Erber's proposition, that is, detection, discrimination, identification, and recognition.
Results:
Three of the eight subjects showed some progression in their auditory performances during the follow-up. The five other subjects showed no long-term progress in their auditory performance.
Conclusions:
Open-set comprehension could be achieved with the insertion of 9 to 10 electrodes of the Nucleus device. Auditory performance in users with ossified cochlea seems to be influenced by the same factors as in users with patent cochlea.