Four-point Impedance Changes in the Early Post-Operative Period after Cochlear Implantation

Abstract

Objective Monitoring four-point impedance changes after cochlear implantation with comparison to conventional impedance measurements. Four-point impedance provides information regarding the bulk biological environment surrounding the electrode array, which is not discernible with conventional impedances. Study Design Prospective observational. Setting Hospital. Patients Adult cochlear implant recipients with no measurable hearing before implantation and implanted with a perimodiolar cochlear implant. Main Outcome Measure(s) Mean values for four-point and common ground impedances were calculated for all electrode contacts at intra-operative, 1 day, 1 week, 4 to 6 weeks, and 3 months post impl..