The Influence of Anaesthetic Drugs on the Laryngeal Motion in Dogs: A Systematic Review
Department of Clinical Diagnostics and Services, Section of Anaesthesiology, Vetsuisse Faculty University of Zurich, Winterthurerstrasse 260, 8057 Zurich, Switzerland
Department of Clinical Veterinary Medicine, Section of Anaesthesiology, Vetsuisse Faculty University of Bern, Hochschulstrasse 6, 3012 Bern, Switzerland
Author to whom correspondence should be addressed.
Received: 6 January 2020 / Revised: 10 March 2020 / Accepted: 16 March 2020 / Published: 22 March 2020
Laryngeal paralysis is secondary to a loss of normal function of the larynx. Older dogs are particularly affected, with normal breathing becoming difficult. A successful diagnosis typically relies on the visualisation of either, complete, or partially absent, laryngeal movements. The use of anaesthesia drugs to provide sedation and stress relief is most commonly necessary during the diagnosis of laryngeal paralysis. While, the excessive administration of anaesthesia drugs may result in absent movements, the ideal anaesthesia regime remains unknown, and the use of sedation is questionable, given the potential for absent laryngeal movements, even in healthy dogs. In this systematic review, we found a potential benefit from using sedation during the evaluation of laryngeal function when compared to injectable anaesthetics only. The respiratory stimulant doxapram was effective in differentiating normal dogs from dogs with laryngeal paralysis but has associated safety hazards.