title: Achievement of hearing preservation in the presence of an electrode covering the residual hearing region.
abstract: CONCLUSIONS
  With full insertion with a long electrode, hearing preservation can be achieved even in the presence of a long electrode covering the residual hearing region.
  
  
  OBJECTIVE
  Advances in developing new atraumatic concepts of electrode design as well as surgical technique have enabled hearing preservation after cochlear implantation surgery, and EAS (electric acoustic stimulation) accompanied with hearing preservation is a new trend for patients with residual hearing at the lower frequencies. However, full insertion with a long/medium electrode and hearing preservation is still a challenging field that calls for discussion.
  
  
  METHODS
  In this study, round window insertion, an atraumatic electrode, and dexamethasone administration were used and atraumaticity (hearing preservation and conservation of vestibular function) was evaluated with full insertion of the electrode.
  
  
  RESULTS
  Postoperative evaluation after full insertion of the electrodes showed that hearing at low frequencies was well preserved in all five cases. Combined postoperative imaging with the referential tonotopic map confirmed achievement of full insertion and indicated the corresponding frequencies and the depth of the electrode. Achievement of atraumaticity of round window insertion in the present cases was confirmed from the viewpoint of the minimal drilling time as well as the preserved vestibular function.
authors.affiliation: Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan. usami@shinshu-u.ac.jp
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Usami
authors.forename: Hideaki
authors.initials: H
authors.lastname: Moteki
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Suzuki
authors.forename: Hisakuni
authors.initials: H
authors.lastname: Fukuoka
authors.forename: Maiko
authors.initials: M
authors.lastname: Miyagawa
authors.forename: Shin-Ya
authors.initials: SY
authors.lastname: Nishio
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Takumi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Iwasaki
authors.forename: Claude
authors.initials: C
authors.lastname: Jolly
mesh_terms: D000328:Adult; D000368:Aged; D000893:Anti-Inflammatory Agents / Q000627:therapeutic use; D002150:Caloric Tests; D019929:Cochlear Implantation / Q000379:methods*; D003054:Cochlear Implants; D003907:Dexamethasone / Q000627:therapeutic use; D005260:Female; D006309:Hearing; D034381:Hearing Loss / Q000517:prevention & control*; D006316:Hearing Loss, High-Frequency / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000517:prevention & control*; D058585:Vestibular Evoked Myogenic Potentials
chemical_list: D000893:Anti-Inflammatory Agents; D003907:Dexamethasone