Speech Recognition Experience with Multichannel Cochlear Implants

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Abstract
Four patients received multichannel intracochlear implants before 1978 as part of the University of Utah program. By 1983, sound coding strategies and electronic miniaturization were developed to allow production and use of a portable sound processor/cochlear stimulator unit. Approval for expanded clinical trials has allowed Implantation of five additional patients by August 1984. Data on the earlier patients demonstrate stability of electrode thresholds and impedance, low risk of the percutaneous pedestal, and the development of speech recognition scores of greater than 60% with electrical stimulation alone and greater than 90% with electrical stimulation combined with lipreading. Data on recent recipients indicate early electrode threshold stability, lower thresholds for apical electrodes, possibility of replacing single-channel with multichannel units, and low morbidity of the implantation. Return to function in a verbally communicating environment has been achieved by one earlier patient.