title: A comparison of the growth of open-set speech perception between the nucleus 22 and nucleus 24 cochlear implant systems.
abstract: OBJECTIVE
  To compare the short-term development of open-set speech perception between implementations of the spectral peak (SPEAK) strategy in adults using the Nucleus 22 (N22) Spectra processor and the Nucleus 24 (N24) system with the SPrint processor.
  
  
  METHODS
  Two sets of patients with a follow-up period of 3 months were compared.
  
  
  METHODS
  This study was conducted at the New York University (NYU) Medical Center.
  
  
  METHODS
  Thirty-six profoundly hearing-impaired adults were included in this study.
  
  
  METHODS
  Sixteen adults received the N22 cochlear implant with the Spectra speech processor and twenty adults received the N24 cochlear implant with the SPrint speech processor.
  
  
  METHODS
  Open-set speech perception for the patients with N22 implants was evaluated preoperatively and postoperatively using the following measures: NU-6 monosyllabic words, Iowa sentences, and CID sentences. CNC words, CUNY sentences, and HINT sentences were used to assess the patients with N24 implants.
  
  
  RESULTS
  Results revealed that the N22 and N24 cochlear implant recipients had significant open-set speech recognition 3 and 6 months after implantation. The apparent favorable absolute scores for the patients with N24 implants were equalized when a multivariate analysis was performed to account for their younger age at time of implantation and shorter length of deafness.
  
  
  CONCLUSIONS
  The growth of open-set word and sentence recognition in similar between the N22 and N24 cochlear implants. Longitudinal studies are needed to determine if higher ceiling scores are present in the N24. Further exploration of monopolar versus bipolar stimulation is warranted.
authors.affiliation: Department of Otolaryngology, New York University School of Medicine, New York 10016, USA.
authors.forename: S B
authors.initials: SB
authors.lastname: Waltzman
authors.forename: N L
authors.initials: NL
authors.lastname: Cohen
authors.forename: J T
authors.initials: JT
authors.lastname: Roland
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019929:Cochlear Implantation / Q000295:instrumentation*; D003638:Deafness / Q000601:surgery*; D004867:Equipment Design; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011182:Postoperative Care; D011300:Preoperative Care; D013067:Speech Perception / Q000502:physiology*; D016896:Treatment Outcome