title: Impedance, neural response telemetry, and speech perception outcomes after reimplantation of cochlear implants in children.
abstract: OBJECTIVE
  To compare mean impedance levels, neural response telemetry (NRT), and auditory perception after initial and explant-reimplant pediatric cochlear implants.
  
  
  METHODS
  Retrospective case review.
  
  
  METHODS
  Tertiary referral hospital and cochlear implant program.
  
  
  METHODS
  Children 0 to 16 years inclusive who have undergone explant-reimplant of their cochlear implant.
  
  
  METHODS
  Impedance levels, NRT, and speech perception performance.
  
  
  METHODS
  Impedance, NRT, and auditory perception at switch on, 3 months, 12 months, 3 years, and 5 years after initial cochlear implant and reimplantation.
  
  
  RESULTS
  The explant-reimplant group receiving Cochlear contour array had significantly (p < 0.001) raised impedance at switch on, 3 months, 12 months, and 3 years, compared with their initial implant. The explant-reimplant group receiving Cochlear straight array had marginally significant (p = 0.045) raised impedance at switch on, 3 months, 12 months, and 3 and 5 years. Infection was associated with greater increases in impedance in the reimplant Contour group. NRT was increased in the explant-reimplant group but not significantly (p = 0.06). Auditory perception returned to preexplant levels within 6 months in 61% of children.
  
  
  CONCLUSIONS
  Impedance is higher after explant-reimplant and remains increased for years after explant-reimplant with Cochlear contour and to a lesser degree the straight array device.
authors.affiliation: *Discipline of Paediatrics and Child Health, Sydney Medical School, University of Sydney; †Sydney Children's Hospital Network (Children's Hospital at Westmead); ‡The Sydney Cochlear Implant Centre; §Emeritus Professor, Sydney Medical School, University of Sydney; and ∥Department of Linguistics, Faculty of Human Sciences, Macquarie University, Sydney, New South Wales, Australia.
authors.forename: Catherine S
authors.initials: CS
authors.lastname: Birman
authors.forename: Halit
authors.initials: H
authors.lastname: Sanli
authors.forename: William P R
authors.initials: WP
authors.lastname: Gibson
authors.forename: Elizabeth J
authors.initials: EJ
authors.lastname: Elliott
mesh_terms: D000293:Adolescent; D001307:Auditory Perception; D002648:Child; D002675:Child, Preschool; D002921:Cicatrix / Q000473:pathology; D003051:Cochlea / Q000473:pathology / Q000601:surgery*; D019929:Cochlear Implantation / Q000379:methods*; D003054:Cochlear Implants; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008297:Male; D012086:Reoperation; D012189:Retrospective Studies; D013067:Speech Perception / Q000502:physiology