title: Intraindividual comparison of psychophysical parameters between perimodiolar and lateral-type electrode arrays in patients with bilateral cochlear implants.
abstract: OBJECTIVE
  Perimodiolar electrode arrays were developed to improve stimulation of specific neuronal populations and to decrease power consumption; however, they can damage the cochlear structure. We examined and compared psychophysical parameters of perimodiolar and lateral-type electrode arrays in patients who received a different type of bilateral cochlear implant (CI) in each ear.
  
  
  METHODS
  Retrospective analysis.
  
  
  METHODS
  Tertiary referral center.
  
  
  METHODS
  Eight child patients (three males, five females) received a different CI in each ear (perimodiolar array and lateral array). They received the CIs sequentially (n = 7) or simultaneously (n = 1).
  
  
  METHODS
  Diagnostic, therapeutic, and rehabilitative.
  
  
  METHODS
  Electrically evoked compound action potential, threshold level, comfort level, and dynamic range (DR) of the basal, mid, and apical electrodes were compared. We also surveyed battery consumption for each device.
  
  
  RESULTS
  Electrically evoked compound action potential threshold, threshold level, and comfort level were lower for the perimodiolar-type electrode array than for the lateral-type electrode array in most patients. However, the DR for the perimodiolar array was narrower than for the lateral array. For most patients, there was little difference in battery life.
  
  
  CONCLUSIONS
  Although the level of electrical energy required for auditory stimulation seems to be lower for the perimodiolar electrode array than for the laterally placed array, the DR was wider and the amount of battery consumption was similar. The electrode array should be chosen by considering various patient factors, such as residual hearing.
authors.affiliation: *Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul; and †Department of Otorhinolaryngology-Head and Neck Surgery, Inha University College of Medicine, Incheon, Republic of Korea.
authors.forename: Junhui
authors.initials: J
authors.lastname: Jeong
authors.forename: Minbum
authors.initials: M
authors.lastname: Kim
authors.forename: Ji Hye
authors.initials: JH
authors.lastname: Heo
authors.forename: Mi-Young
authors.initials: MY
authors.lastname: Bang
authors.forename: Mi Ran
authors.initials: MR
authors.lastname: Bae
authors.forename: Jungmin
authors.initials: J
authors.lastname: Kim
authors.forename: Jae Young
authors.initials: JY
authors.lastname: Choi
mesh_terms: D000161:Acoustic Stimulation; D000200:Action Potentials / Q000502:physiology*; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D019929:Cochlear Implantation; D003054:Cochlear Implants; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006309:Hearing / Q000502:physiology*; D034381:Hearing Loss / Q000503:physiopathology / Q000601:surgery*; D006320:Hearing Tests; D006801:Humans; D007223:Infant; D008297:Male; D012189:Retrospective Studies; D016896:Treatment Outcome