Impact of modulating phase duration on electrically evoked auditory brainstem responses obtained during cochlear implantation. (May 2015)

• Record Type: Journal Article
• Authors: Bonne, N-X; Douchement, D; Hosana, G; Desruelles, J; Fayoux, P; Ruzza, I; Vincent, C
• Is Part Of: Cochlear implants international. Volume 16:Number 3(2015)
• Page Start: 168
• Page End: 174
• Publication Date: 2015-05
• Subjects: Cochlear implants -- Periodicals; 617.882
• DOI: 10.1179/1754762814Y.0000000095
• Languages: German
• ISSNs: 1467-0100

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <sec> <title>Objective</title> <p>To investigate the effect of increasing phase duration (pulse width, T-pulse) using a biphasic pulse composed of an initial anodic active phase followed by a balancing cathodic phase on the electrically evoked auditory brainstem responses (eABRs) recorded at the time of cochlear implantation.</p> </sec> <sec> <title>Design</title> <p>eABRs recorded during 188 surgeries for cochlear implantation from 1999 to 2006 in a single center were retrospectively reviewed by two independent observers. All patients were fitted with a NEURELEC cochlear implant (CI) device, initially DIGISONIC<sup>®</sup> then DIGISONIC SP<sup>®</sup> (2004–2006).</p> </sec> <sec> <title>Result</title> <p>Immediately following cochlear implantation, stimulation by the CI resulted in reliable wave III and V eABR waveforms (mean wave III latency 2.23 ± 0.38 ms SD and wave V latency 4.28 ± 0.42 ms SD). Latencies followed an apical to basal gradient (0.32 ms increase in mean eV latency and 0.12 ms for eIII latency). With increasing phase duration, wave III and wave V latencies significantly decreased in association with a shortening of the eIII–eV interwave gap, while amplitudes of both waves increased.</p> </sec> <sec> <title>Conclusion</title> <p>The impact of increasing phase duration on latency and amplitude of brainstem responses in a large set of patients implanted with NEURELEC CIs was reported.</p> </sec> </abstract>