title: Long-term results of hearing preservation cochlear implant surgery in patients with residual low frequency hearing.
abstract: CONCLUSIONS
  Differences were found between patients with stable hearing and those with progressive hearing loss in the lower frequencies with respect to the rate of progression in the contralateral ear. It is suggested that the electric acoustic stimulation (EAS) can provide improvement in hearing ability over the long-term if residual hearing might be lost to some extent.
  
  
  OBJECTIVE
  To evaluate the long-term threshold changes in the low frequency hearing of the implanted ear as compared with the non-implanted ear, and the hearing abilities with EAS along with the extent of residual hearing.
  
  
  METHODS
  Seventeen individuals were enrolled and received the EAS implant with a 24-mm FLEXeas electrode array. Hearing thresholds and speech perception were measured pre- and post-operatively for 1-5 years. Post-operative hearing preservation (HP) rates were calculated using the preservation numerical scale.
  
  
  RESULTS
  The average linear regression coefficient for the decline in hearing preservation score was -6.9 for the implanted ear and the patients were subsequently categorized into two groups: those with better than average, stable hearing; and those with worse than average, progressive hearing loss. EAS showed better results than electric stimulation alone, in spite of an absence of speech perception with acoustic stimulation.
authors.affiliation: a Department of Otorhinolaryngology , Shinshu University School of Medicine , Matsumoto , Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Moteki
authors.affiliation: a Department of Otorhinolaryngology , Shinshu University School of Medicine , Matsumoto , Japan.
authors.forename: Shin-Ya
authors.initials: SY
authors.lastname: Nishio
authors.affiliation: a Department of Otorhinolaryngology , Shinshu University School of Medicine , Matsumoto , Japan.
authors.forename: Maiko
authors.initials: M
authors.lastname: Miyagawa
authors.affiliation: a Department of Otorhinolaryngology , Shinshu University School of Medicine , Matsumoto , Japan.
authors.forename: Keita
authors.initials: K
authors.lastname: Tsukada
authors.affiliation: b Department of Hearing Implant Sciences , Shinshu University School of Medicine , Matsumoto , Japan.|c Department of Otolaryngology , International University of Health and Welfare, Mita Hospital , Tokyo , Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Iwasaki
authors.affiliation: a Department of Otorhinolaryngology , Shinshu University School of Medicine , Matsumoto , Japan.
authors.forename: Shin-Ichi
authors.initials: SI
authors.lastname: Usami
mesh_terms: D000328:Adult; D000368:Aged; D019929:Cochlear Implantation; D005260:Female; D006309:Hearing; D006316:Hearing Loss, High-Frequency / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013067:Speech Perception
keywords: Cochlear implant; electric acoustic stimulation; hearing loss; speech perception