title: Single-channel to multichannel conversions in adult cochlear implant subjects.
abstract: OBJECTIVE
  This study aimed to compare open-set speech perception of single-channel with multichannel cochlear implants in the same ear of postlingually deafened adults.
  
  
  METHODS
  The study design was a retrospective case and literature review.
  
  
  METHODS
  The study was conducted at a tertiary referral center with an associated veterans administration hospital.
  
  
  METHODS
  Postlingually deafened adults with at least 6 months of experience with a single-channel cochlear implant were studied.
  
  
  METHODS
  Replacement of a single-channel with a multichannel cochlear implant in the same ear was performed.
  
  
  METHODS
  Open-set word and sentence perception scores at least 6 months after single-channel implantation and multichannel reimplantation were measured.
  
  
  RESULTS
  Six of six patients had substantial improvement in open-set speech recognition after reimplantation of the same ear.
  
  
  CONCLUSIONS
  Removal of a functioning single-channel implant and replacement with a multichannel device are appropriate in postlingually deafened adults who desire better speech recognition.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, University of Iowa College of Medicine, Iowa City, USA.
authors.forename: J T
authors.initials: JT
authors.lastname: Rubinstein
authors.forename: W S
authors.initials: WS
authors.lastname: Parkinson
authors.forename: M W
authors.initials: MW
authors.lastname: Lowder
authors.forename: B J
authors.initials: BJ
authors.lastname: Gantz
authors.forename: J B
authors.initials: JB
authors.lastname: Nadol
authors.forename: R S
authors.initials: RS
authors.lastname: Tyler
mesh_terms: D000328:Adult; D019929:Cochlear Implantation / Q000295:instrumentation; D003638:Deafness / Q000601:surgery*; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012086:Reoperation; D012189:Retrospective Studies; D013069:Speech Reception Threshold Test; D013136:Spiral Ganglion / Q000473:pathology; D013701:Temporal Bone / Q000473:pathology