Electrically evoked potentials recorded in adult and pediatric CLARION® implant users

J. B. Firszt, R. D. Chambers, L. A. Rotz, M. A. Novak

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

The purpose of this study was to record electrical auditory brain stem responses (EABRs) and electrical middle, latency responses (EMLRs) in-the clinic from 3 adult CLARION® Multi-Strategy(TM) Cochlear Implant subjects and to record EABRs in the operating room from 3 pediatric subjects. For 2 of the 3 adult subjects, EABR thresholds were within the subject's behavioral dynamic range, whereas 1 adult subject's EABR thresholds were either absent or, when present, exceeded the upper limit of the dynamic range. For this subject, EMLRs were absent or of poor morphology for the channels tested. Moreover, this subject was not able to understand speech in an open-set, auditory-only format. The EABR thresholds obtained with children were within the behavioral dynamic range for 2 of the 3 subjects, but exceeded comfortable loudness levels for 1 subject. Although the EABR thresholds were measured at stimulus levels that were audible for all subjects, the relationship of the EABR threshold levels to behavioral measures of loudness varied. Evoked potentials that originate more centrally, such as the EMLR, should be investigated further to determine the possible relationship to postimplant performance.

Original languageEnglish
Pages (from-to)58-63
Number of pages6
JournalAnnals of Otology, Rhinology and Laryngology
Volume108
Issue number4 II
StatePublished - May 4 1999
Externally publishedYes

Keywords

  • Cochlear implant
  • Electrical stimulation
  • Electrically evoked auditory brain stem response
  • Electrically evoked middle latency response
  • Electrophysiological measures

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