gms | German Medical Science

81. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie e. V.

Deutsche Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie e. V.

12.05. - 16.05.2010, Wiesbaden

Electrically evoked cortical auditory potentials in Cochlear Implant listeners in comparison to speech performances

Meeting Abstract

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  • corresponding author presenting/speaker Galina Danilkina - ENT-Department University of Erlangen-Nuremberg, Erlangen, Germany
  • author Ulrich Hoppe - ENT-Department University of Erlangen-Nuremberg, Erlangen, Germany
  • author Johannes Zenk - ENT-Department University of Erlangen-Nuremberg, Erlangen, Germany
  • author Heinrich Iro - ENT-Department University of Erlangen-Nuremberg, Erlangen, Germany

German Society of Oto-Rhino-Laryngology, Head and Neck Surgery. 81st Annual Meeting of the German Society of Oto-Rhino-Laryngology, Head and Neck Surgery. Wiesbaden, 12.-16.05.2010. Düsseldorf: German Medical Science GMS Publishing House; 2010. Doc10hno045

DOI: 10.3205/10hno045, URN: urn:nbn:de:0183-10hno0455

Veröffentlicht: 6. Juli 2010

© 2010 Danilkina et al.
Dieser Artikel ist ein Open Access-Artikel und steht unter den Creative Commons Lizenzbedingungen (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.de). Er darf vervielfältigt, verbreitet und öffentlich zugänglich gemacht werden, vorausgesetzt dass Autor und Quelle genannt werden.


Gliederung

Text

Cortical auditory evoked potentials (CAEPs) in Cochlear Implant (CI) listeners reflect the activity of auditory cortex and are able to objectify the results of cochlear implantation. They can be evoked by the stimulation of particular implant electrodes by using experimentally developed software and observed both in response to the beginning of the stimulation (P1N1P2 complex) and to change during the stimulation (Acoustic Change Complex, ACC). The aim of our study was to measure CAEPs in CI listeners during the first hearing rehabilitation (FHR) and after 6 months of CI usage and to compare CAEPs with individual speech performances.

CAEPs were measured in 10 CI listeners (age 59±19 years, 3 females, 7 males) during the first 5 days after speech processor switch on and after 6 months of CI experience. The speech performance was measured by a monosyllabic words test. The CAEPs were obtained using direct electrical stimulation of neighbouring implant electrodes: basal electrodes nos.3/4, middle electrodes nos.10/11 and apical electrodes nos.18/19. The stimulation level based on subjective sensation of “loud, but not too loud” signals and was adjusted until the sensation of both electrodes was the same.

The latencies of P1N1P2 complex tend to decrease, the N1P2 amplitudes of P1N1P2 complex and of ACC tend to increase during the FHR. The parameters of P1N1P2 complex do not correlate significantly with speech performance. The latencies and the N1P2 amplitude of ACC correlate significantly with speech performance, but only during the FHR.

By means of the ACC the changes of central hearing system can be ascertained, which are responsible for speech performance improvement during the FHR.


References

1.
Martin BA. Can the acoustic change complex be recorded in an individual with a cochlear implant? Separating neural responses from cochlear implant artefact. J Am Acad Audiol. 2007;18(2):126-40.
2.
Brown CJ, Etler C, He S, O'Brien S, Erenberg S, Kim JR, Dhuldhoya AN, Abbas PJ. The electrically evoked auditory change complex: preliminary results from nucleus cochlear implant users. Ear Hear. 2008;29(5):704-17.
3.
Kim JR, Brown CJ, Abbas PJ, Etler CP, O'Brien S. The effect of changes in stimulus level on electrically evoked cortical auditory potentials. Ear Hear. 2009;30(3):320-9.