Preliminary results with the Clarion cochlear implant in postlingually deaf adults.

A clinical trial of three different multichannel cochlear implants is in progress at The University of Iowa. Fifty postlingually deaf adults participated in a prospective randomized study of the Nucleus implant and the Ineraid device. Subsequently, 23 consecutive postlingually deaf adults have been implanted with the Clarion system. The speech perception performance obtained after 9 months of implant use with all devices was compared. In addition, Clarion patient results at 9 months were compared with long-term (36 months) results from subjects using the other two multichannel implants. Preliminary speech perception scores on the Iowa sentence test (sound-only) and NU-6 words (sound-only) demonstrate that the Clarion subjects, as a group, perform at higher levels than subjects using the other two systems. A wide range of performance is observed with all devices. The continuous interleaved pulsatile strategy of the Clarion device appears to be advantageous for this group of subjects.