Objective: To determine the preservation of pure tone thresholds for a series of cochlear implant patients who underwent atraumatic round window insertion with a new thin 22-mm electrode to a 20-mm depth.
Study Design: Retrospective, within-subject repeated measures design.
Setting: Tertiary care hospital.
Patients: Nine sequential cochlear implant patients with functional preoperative acoustic hearing (defined as low-frequency pure tone average thresholds ≤90 dB).
Intervention: Therapeutic.
Main Outcome Measure: Pure tone thresholds after cochlear implantation.
Results: Low-frequency hearing preservation was achieved in all cases. Less than 10 dB average change was seen for low-frequency pure tone average measures (125, 250, 500, and 1,000 Hz) at 6 and 12 months following cochlear implantation.
Conclusions: Atraumatic round window insertion with a thin 22-mm electrode to a 20-mm depth results in dramatically high levels of acoustic hearing preservation among CI patients.
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