The Effect of Long-Term Deafness on Speech Recognition in Postlingually Deafened Adult Clarion® Cochlear Implant Users

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Abstract
Research suggests that duration of deafness prior to cochlear implantation affects postoperative speech recognition in adults. Duration of deafness usually is defined as the number of years between the onset of profound deafness and implantation. The purpose of this study was to examine the effects of duration of deafness — expressed as percentage of life with deafness — independent of age at implantation on postoperative speech recognition in adult postlingually deafened CLARION® Multi-Strategy™ Cochlear Implant users. Speech recognition tests (CID sentences and NU6 words) were administered to 202 consecutively implanted adults preoperatively and at 3 and 6 months after initial device fitting. Patients implanted at a younger age and those with smaller percentages of their lives with deafness achieved the highest levels of short-term postoperative speech recognition. Patients who had been deaf for ≥60% of their lives demonstrated a slower rate of speech recognition improvement than those with shorter durations of deafness, but still continued to improve with increased implant experience.