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This version was published on 1 July 2009
Lab Anim 2009;43:291-294
doi:10.1258/la.2008.008014
© 2009 Laboratory Animals Limited

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Original Articles

Cardiac arrhythmias related to continuous thermodilution cardiac output measurement in an anaesthetized sheep

P Coppens  and Y Moens

Clinic for Anaesthesiology and Perioperative Intensive Care, University of Veterinary Medicine Vienna, Veterinärplatz 1, A-1210 Vienna, Austria

Corresponding author: Paul Coppens. Email: paul.coppens{at}vu-wien.ac.at

A case of cardiac arrhythmias related to continuous thermodilution cardiac output (CCO) is reported. A sheep anaesthetized for experimental purpose was instrumented with a special Swan-Ganz catheter-type to be used for CCO measurements. One hour after starting the CCO monitoring, isolated ventricular extrasystoles were noticed on the electrocardiogram with an increasing frequency. Subsequently bursts of extrasystoles occurred. Atrioventricular dissociation was also observed. The peaks of temperature of the thermal filament were within the normal range and their presence was noticed when arrhythmias appeared. Mean blood pressure and cardiac output did not change during this episode. When the CCO was switched off, no more arrhythmias were observed. The CCO Swan-Ganz by itself did not generate any arrhythmia. The sheep recovered uneventfully. When arrhythmias occur during anaesthesia where CCO is used, a thermal filament induced origin of the arrhythmia must be considered.

Key Words: Continuous cardiac output • Swan-Ganz catheter • thermodilution • ventricular extrasystole • arrhythmia


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