Response Changes During Insertion of a Cochlear Implant Using Extracochlear Electrocochleography

Objectives: Electrocochleography is increasingly being utilized as an intraoperative monitor of cochlear function during cochlear implantation (CI). Intracochlear recordings from the advancing electrode can be obtained through the device by on-board capabilities. However, such recordings may not be ideal as a monitor because the recording electrode moves in relation to the neural and hair cell generators producing the responses. The purposes of this study were to compare two extracochlear recording locations in terms of signal strength and feasibility as intraoperative monitoring sites and to characterize changes in cochlear physiology during CI insertion. Design: In 83 human subjects, responses to 90 dB nHL tone bursts were recorded both at the round window (RW) and then at an extrac...

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