title: Use of a mid-scala and a lateral wall electrode in children: insertion depth and hearing preservation.
abstract: CONCLUSIONS
  Atraumatic insertion of the HiFocusTMMid-Scala (HFMS) electrode via the round window was successfully achieved in seven children. Residual hearing 6 months post-operatively was preserved to within 10 dB HL of the pre-operative audiogram at 500 Hz for six children, indicating minimal initial insertion trauma to the cochlea.
  
  
  OBJECTIVE
  The objectives were to document the clinical experience and evaluate differences between HFMS and HiFocusTM1j (HF1j) by means of insertion depth and hearing preservation results.
  
  
  METHODS
  Nineteen children were prospectively recruited and consecutively implanted with the HF1j electrode (n = 12) or the HFMS electrode (n = 7) via the round window. Average median angular insertion depths and the amount of residual hearing preserved at 6 months post-operatively were compared between the two electrode groups.
  
  
  RESULTS
  The median angular insertion depth for the HF1j was 439° and for the HFMS 435°. Preservation of residual hearing at 500 Hz was assessed in seven HFMS subjects and 11 HF1j subjects. Based on the Skarzynski formula, three out of seven subjects (42%) in the HFMS group had their residual hearing completely preserved at 500 Hz. In the control group, no subjects had complete hearing preservation and five subjects had a complete loss of residual hearing.
authors.affiliation: a ENT Department , CLINIQUE RACHIDI , Casablanca , Morocco.
authors.forename: Abdelhamid
authors.initials: A
authors.lastname: Benghalem
authors.affiliation: b Clinical Research International, AB AG , Stäfa , Switzerland.
authors.forename: Dzemal
authors.initials: D
authors.lastname: Gazibegovic
authors.affiliation: c RIFMED , Casablanca , Morocco.
authors.forename: Fatima
authors.initials: F
authors.lastname: Saadi
authors.affiliation: d Groupe Radiologique de Casablanca , Casablanca , Morocco.
authors.forename: Zakia
authors.initials: Z
authors.lastname: Tazi-Chaoui
mesh_terms: D002648:Child; D002675:Child, Preschool; D019929:Cochlear Implantation / Q000379:methods*; D003054:Cochlear Implants; D006309:Hearing; D006801:Humans; D007223:Infant; D011446:Prospective Studies
keywords: Cochlear implant; electrode; hearing preservation; insertion depth; insertion trauma; mid scala; residual hearing