title: Cochlear implant outcome is not influenced by the choice of ear.
abstract: OBJECTIVE
  This study tested the hypothesis that patients with residual hearing in the nonimplanted ear had the same cochlear implant benefit whether the implanted ear had profound or severe hearing loss.
  
  
  METHODS
  A retrospective chart review of adult cochlear implant recipients with postlingual hearing loss. Patients were categorized according to the pure-tone average of the implanted and contralateral ears as (a) bilateral profound, (b) severe-profound, and (c) bilateral severe. The results of a test battery of spoken language measures were compared among patients belonging to these hearing categories at 6, 12, and 24 months after surgery, using a t-test and multivariate regression analyses.
  
  
  RESULTS
  The presence of residual hearing in one or both ears was associated with significantly higher postoperative speech perception scores compared with participants with bilateral profound hearing loss. Among participants with similar amounts of residual hearing in the nonimplanted ear, however, there was no difference in speech recognition scores between those with profound and those with severe hearing loss in the implanted ear.
  
  
  CONCLUSIONS
  Among participants with asymmetric hearing loss, there is no additional benefit to implanting the better-hearing ear that can be preserved for use with a hearing aid for better speech understanding in noise and sound localization. These results suggest that the additional benefit received by patients with residual hearing is mediated by trophic effects on crossed pathways in the central nervous system and is independent of the preoperative functional status of the implanted ear.
authors.affiliation: The Listening Center, Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Howard W
authors.initials: HW
authors.lastname: Francis
authors.forename: Jennifer D
authors.initials: JD
authors.lastname: Yeagle
authors.forename: Stephen
authors.initials: S
authors.lastname: Bowditch
authors.forename: John K
authors.initials: JK
authors.lastname: Niparko
mesh_terms: D000328:Adult; D000367:Age Factors; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D003054:Cochlear Implants; D005260:Female; D034381:Hearing Loss / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013067:Speech Perception; D013069:Speech Reception Threshold Test; D016896:Treatment Outcome