Revision Cochlear Implantation Using a Double‐Array Device in the Post‐meningitis Ossified Cochlea

Abstract

Objectives: Describe the surgical technique and outcome in a series of patients who underwent revision cochlear implantation using a double-array or split electrode device. All patients had an ossified cochlea due to meningitis and were functioning poorly with a standard electrode cochlear implant. Methods: Four patients between the ages of 4-15 years underwent revision with 5 double-array cochlear implant devices in our center during the years 2010-2012. One patient underwent bilateral revision surgery. All patients suffered from meningitis with computed tomography and magnetic resonance imaging studies that demonstrated an ossified cochlea. The time interval between the disease and initial cochlear implantation was 4 months to 4 years. Patients data were retrospectively analyzed with emphasis on the surgical technique, number of electrodes inserted, and number of active electrodes at follow-up. In addition, pre and post revision surgery function was compared. Results: The revision surgery was carried out 4 to 10 years after the initial surgery. Two tunnels, basal and apical, were drilled in the ossified cochlea. In each of the tunnels 5 to 12 electrodes were inserted. While the number of active electrodes before revision was 0-5, after revision with the double array it increased to 8-16. This resulted in increased auditory and speech function. Conclusions: The double-array device can provide good outcome in the post-meningitis ossified cochlea. In many of these cases function can be better than with a single electrode device.