gms | German Medical Science

55. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie e. V. (DGNC)
1. Joint Meeting mit der Ungarischen Gesellschaft für Neurochirurgie

Deutsche Gesellschaft für Neurochirurgie (DGNC) e. V.

25. bis 28.04.2004, Köln

Evaluation of inner ear function before and after diagnostic large volume CSF removal in normal pressure hydrocephalus patients

Die Entnahme größerer Liquormengen und der Einfluss auf die Innenohrfunktion

Meeting Abstract

  • corresponding author Olaf Leheta - Neurochirurgische Klinik, Universitätsklinikum Mannheim, Mannheim
  • J. T. Maurer - Hals-, Nasen- und Ohrenklinik, Universitätsklinikum Mannheim, Mannheim
  • U. Gössler - Hals-, Nasen- und Ohrenklinik, Universitätsklinikum Mannheim, Mannheim
  • M. Hülse - Hals-, Nasen- und Ohrenklinik, Universitätsklinikum Mannheim, Mannheim
  • K. Hörmann - Hals-, Nasen- und Ohrenklinik, Universitätsklinikum Mannheim, Mannheim
  • J. K. Krauss - Neurochirurgische Klinik, Universitätsklinikum Mannheim, Mannheim

Deutsche Gesellschaft für Neurochirurgie. Ungarische Gesellschaft für Neurochirurgie. 55. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie e.V. (DGNC), 1. Joint Meeting mit der Ungarischen Gesellschaft für Neurochirurgie. Köln, 25.-28.04.2004. Düsseldorf, Köln: German Medical Science; 2004. DocP 13.134

Die elektronische Version dieses Artikels ist vollständig und ist verfügbar unter: http://www.egms.de/de/meetings/dgnc2004/04dgnc0418.shtml

Veröffentlicht: 23. April 2004

© 2004 Leheta 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

Objective

Diagnostic removal of cerebrospinal fluid (CSF) via lumbar puncture or drainage is a routine procedure in patients with suspected normal pressure hydrocephalus (NPH). Large volume CSF removal, however, may result in hearing loss. We have shown previously that there is no change in pure tone and speech audiometry after diagnostic CSF removal in NPH patients. In this study, inner ear function was assessed by additional objective examinations.

Methods

In this prospective study, 55 consecutive patients with suspected NPH underwent diagnostic large volume CSF removal via lumbar puncture or lumbar drainage. All patients underwent a test battery including pure tone audiometry, speech audiometry for total word comprehension (mono syllables) and number comprehension, tympanometry, threshold of stapedius reflex, evoked otoacoustic emissions, nystagmogram and acoustic evoked potentials before and after CSF removal to investigate its short-term effect on inner ear function. A significant difference in the hearing levels was presumed if the normal individual range of 10 dB in tone audiometry or 10% in speech audiometry was exceeded. Patients were reexamined within the first three days after CSF removal.

Results

There were no complications related to large volume CSF removal. In pure tone audiometry, some patients had hearing loss or showed improvement of hearing in more than four frequencies tested. This correlated neither with the method of CSF removal (LP vs. Touhy drainage) nor with a cognitive change due to the CSF removal. Tympanometry, threshold of stapedius reflex and evoked otoacoustic emissions showed no differences before and after CSF removal. The results of these examinations supported the findings of audiometry. Nystagmograms were unremarkable after CSF drainage. The acoustic evoked potentials showed no significant differences in amplitudes, latencies or inter-peek-latencies.

Conclusions

Diagnostic large volume CSF removal by lumbar puncture or by lumbar drainage appears to be relatively safe concerning inner ear function in patients with suspected NPH.