Reimplantation of hybrid cochlear implant users with a full-length electrode after loss of residual hearing.
OBJECTIVE
To assess word recognition and pitch-scaling abilities of cochlear implant users first implanted with a Nucleus 10-mm Hybrid electrode array and then reimplanted with a full length Nucleus Freedom array after loss of residual hearing.


BACKGROUND
Although electroacoustic stimulation is a promising treatment for patients with residual low-frequency hearing,a small subset of them lose that residual hearing. It is not clear whether these patients would be better served by leaving in the 10-mm array and providing electric stimulation through it, or by replacing it with a standard full-length array.


METHODS
Word recognition and pitch-scaling abilities were measured in 2 users of hybrid cochlear implants who lost their residual hearing in the implanted ear after a few months. Tests were repeated over several months, first with a 10-mm array, and after, these patients were reimplanted with a full array. The word recognition task consisted of 2 50-word consonant nucleus consonant (CNC) lists. In the pitch-scaling task, 6 electrodes were stimulated in pseudorandom order, and patients assigned a pitch value to the sensation elicited by each electrode.


RESULTS
Shortly after reimplantation with the full electrode array, speech understanding was much better than with the 10-mm array. Patients improved their ability to perform the pitch-scaling task over time with the full array, although their performance on that task was variable, and the improvements were often small.


CONCLUSIONS
1) Short electrode arrays may help preserve residual hearing but may also provide less benefit than traditional cochlear implants for some patients. 2) Pitch percepts in response to electric stimulation may be modified by experience.
Fitzgerald
Matthew B
MB
Department of Otolaryngology, New York University School of Medicine, New York, New York 10016, USA.
Sagi
Elad
E
Jackson
Michael
M
Shapiro
William H
WH
Roland
J Thomas
JT
Waltzman
Susan B
SB
Svirsky
Mario A
MA
D000368:Aged; D000369:Aged, 80 and over; D001299:Audiometry; D019929:Cochlear Implantation; D003054:Cochlear Implants; D004566:Electrodes; D034381:Hearing Loss / Q000628:therapy*; D006801:Humans; D008297:Male; D010898:Pitch Perception / Q000502:physiology; D012092:Replantation; D013067:Speech Perception / Q000502:physiology