Four-Point Impedance Changes After Cochlear Implantation for Lateral Wall and Perimodiolar Implants

Abstract

Objective: Monitor four-point impedance in cochlear implant recipients over time and determine if implant type, surgical approach, and electrode positioning affected impedance measurements. Study Design: Prospective observational. Setting: Hospital. Patients Adult cochlear implant recipients implanted with a perimodiolar or lateral wall cochlear implant. Main Outcome Measure(s) Mean values for four-point impedances were calculated for all electrode contacts at perioperative and 3 months after surgery. Linear mixed models were applied to the impedance data to compare between implant types and time points. The angular insertion depth and electrode position relative to the medial and lateral wa..