Depth of Cochlear Implant Array Within the Cochlea and Performance Outcome

作者：Hilly Ohad^*; Smith Leah; Hwang Euna; Shipp David; Symons Sean; Nedzelski Julian M; Chen Joseph M; Lin Vincent Y W

来源：Annals of Otology, Rhinology and Laryngology, 2016, 125(11): 886-892.

DOI：10.1177/0003489416660111

• cochlear implantation
• depth of insertion
• outcome
• hearing in noise test
• cochlear implant trials

Objective: To evaluate whether the depth of cochlear implant array within the cochlea affects performance outcomes 1 year following cochlear implantation.
Methods: A retrospective case review of 120 patients who were implanted with the Advanced Bionics HiFocus 1J. Post-implantation plain-radiographs were retrospectively reviewed, and the depth of insertion was measured in degrees from the round window to the electrode tip. Correlation between the depth of insertion and 1-year post-activation Hearing in Noise Test (HINT) scores was analyzed. Intrascala position was not assessed.
Results: Depth of electrode insertion ranged from 180 degrees to 720 degrees, and HINT scores ranged from 0% to 100%. A Mann-Whitney U test demonstrated significantly improved 1-year post-activation HINT scores in patients with an insertion depth of 360 degrees or more in comparison with patients with insertion depth of less than 360 degrees (81% vs 61%, P = .048). Patients with 13 to 15 contacts within cochlear turns performed as well as patients with full insertion of all 16 contacts, while patients with only 12 contacts performed poorly.
Conclusions: Insertion depth of the AB HiFocus 1J electrode of less than 360 degrees is associated with reduced 1-year post-activation HINT scores when compared with deeper insertions. Partial insertion of 13 active contacts or more led to similar results as full insertion.

• 出版日期2016-11