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79th Annual Meeting of the German Society of Oto-Rhino-Laryngology, Head and Neck Surgery

German Society of Oto-Rhino-Laryngology, Head and Neck Surgery

30.04. - 04.05.2008, Bonn

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Videokymography evaluation after thyroid surgery

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  • corresponding author Jan Kastner - HNO-Klinik Prag, Prag, Tschechische Republik
  • Michal Zábrodský - HNO-Klinik Prag-Motol, Karls-Universität, Prag, Tschechische Republik
  • František Šram - Medical Healthcom, Prag, Tschechische Republik
  • Jan Švec - Groningen Voice Research Lab, University of Groningen, Groningen, Netherlands
  • Jan Betka - HNO-Klinik Prag-Motol, Karls-Universität, Prag, Tschechische Republik

Deutsche Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie. 79. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie. Bonn, 30.04.-04.05.2008. Düsseldorf: German Medical Science GMS Publishing House; 2008. Doc08hnod506

The electronic version of this article is the complete one and can be found online at: http://www.egms.de/en/meetings/hnod2008/08hnod506.shtml

Published: April 22, 2008

© 2008 Kastner et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.en). You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.

Outline

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Videokymography is a method of vocal fold movement evaluation introduced in 90's of 20th century by Švec, Schutte and Šram. It is based on the optical analysis of digital imaging (high-frequency camera, 4000–8000 pictures/sec.) of vocal fold movement; simplified, it is a method which evaluates oscillation amplitudes of vocal fold in time axis and could be proceeded at various glottis planes (e.g. front, central, rear). A harmonic undulation outcome is shown in a healthy vocal fold.

In a cohort of thyroid surgery patients, who are operated at Motol ENT dpt. in Prague, there is a group of patients, who suffer from mild dysphonia even when postoperative indirect laryngoscopy reveals symmetrical vocal folds movement. We applied a videokymography method to assess if their vocal folds movement is “invisibly” impaired.

A group of 50 patients prior and after thyroid surgery was examined using high-frequency camera. Another group of 50 patients with an operation of ENT-region outside larynx and neck was examined prior and after surgery to exclude the impact of intubation on impaired vocal fold movement.

We detected minimum of gross vocal fold trauma (haematoma, oedema) in both groups. Fine alterations of vocal fold movement were presented in a thyroid patients group. Results and typical videokymography findings will be presented. The role of recurrent laryngeal nerve intraoperative preservation and nerve micro-injury will be discussed.

Unterstützt durch: Grant GAUK Nr.203435 36/06 (Prague, Czech Republic)