gms | German Medical Science

77. 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.

24.05. - 28.05.2006, Mannheim

Vestibular function in adult patients with bilateral cochlear implant

Untersuchungen zur Gleichgewichtsfunktion bei erwachsenen Patienten mit bilateraler Cochlea Implantation

Meeting Abstract

  • corresponding author presenting/speaker Lucy Haurisa - Department of Otolaryngology, Medical University of Hanover, Hannover, Germany
  • Anke Lesinski-Schiedat - Department of Otolaryngology, Medical University of Hanover, Hannover, Germany
  • Burkard Schwab - Department of Otolaryngology, Medical University of Hanover, Hannover, Germany
  • Thomas Lenarz - Department of Otolaryngology, Medical University of Hanover, Hannover, Germany

German Society of Otorhinolaryngology, Head and Neck Surgery. 77th Annual Meeting of the German Society of Otorhinolaryngology, Head and Neck Surgery. Mannheim, 24.-28.05.2006. Düsseldorf, Köln: German Medical Science; 2006. Doc06hno016

Die elektronische Version dieses Artikels ist vollständig und ist verfügbar unter: http://www.egms.de/de/meetings/hno2006/06hno016.shtml

Veröffentlicht: 7. September 2006

© 2006 Haurisa 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 vervielf&aauml;ltigt, verbreitet und &oauml;ffentlich zug&aauml;nglich gemacht werden, vorausgesetzt dass Autor und Quelle genannt werden.


Gliederung

Text

Introduction: To which extent bilateral cochlear implantation may cause damage to the semicircular canal has not been examined yet. The aim of the study was to evaluate the rate of postoperative vestibular areflexia and secondly to evaluate the number of patients with dizziness after cochlear implantation.

Patients and methods: In this report the results of classical (spontaneous nystagmus, head-shaking nystagmus, positional testing, postural control test) and caloric response were obtained from 23 bilaterally implanted adult patients pre- and postoperatively.

The difference between post- and preoperative score was calculated for each patient. A positive score reflected the postoperative deterioration of vestibular function.

Dizziness in everyday life was retrospectively evaluated pre- and up to 12 months postoperatively by using the modified Stoll questionnaire on vestibular dysfunction in everyday life.

Patients: bilaterally implanted adult patients, n=23. Healthy patients in matched pairs technique, n=23. Unilaterally implanted patients, n=6.

Results: Postoperative loss of vestibular function occurred after three of a total of 38 surgeries (=7.9 %), shown by areflexia in caloric testing.

Bilateral CI patients: 13 patients showed improvement of vestibular function, 3 no change, 7 deterioration.

Results of questionnaire: bilateral CI patients: no deterioration in 18 patients (=78.3 %) preoperatively. Postoperative episodic dizziness was reported within the first seven days by eight patients (34.5 %), within the first month by three patients (=13.0 %).

Discussion: The preservation of vestibular function could not be achieved in three patients (=7.9 %). This rate is below the rate of postoperative loss of vestibular function cited in literature (30-60 %). The reason might be growing experience of atraumatic insertion of the electrode into the cochlea. Postoperative dizziness mainly occurred within the first seven days and remained at a constant level after one month. Furthermore there was no correlation between vestibular score and subjective reports of dizziness. The reason might be the compensation of vestibular dysfunction in the meantime.


References

1.
Feldmann H., Das Gutachten des Hals-Nasen-Ohren-Arztes, Thieme Verlag, 5.Auflage 2001, S. 109-110
2.
Kubo T, et al. Different forms of dizziness occuring after cochlear implant. Eur Arch Otorhinolaryngol 2001: 258:9-12
3.
Van den Broek et al. Vestibular function in cochlear implant patients, Acta Otolaryngol 1993: 263-265