• S Canfrán, R Cediel, I Sández, A Caro-Vadillo, and I A Gómez de Segura.
• Department of Animal Medicine and Surgery, Veterinary Faculty, Complutense University of Madrid, Madrid, 28040, Spain.
• J Small Anim Pract. 2015 Jul 1; 56 (7): 450-5.

ObjectivesTo compare cardiac output measured by oesophageal Doppler and by thermodilution monitoring and to correlate the Doppler cardiac output-generated minute distance with thermodilution cardiac output in healthy anaesthetised beagle dogs.Materials And MethodsProspective experimental study. Six healthy adult beagle dogs were pre-medicated with intramuscular acepromazine (0 · 05 mg/kg) and methadone (0 · 3 mg/kg). Anaesthesia was induced with intravenous propofol (dose-effect) and maintained with isoflurane in oxygen. Simultaneously, a constant rate infusion of dopamine (3 µg/kg/minute) was administered to the dogs to prevent hypotension. The minute distance, Doppler and thermodilution cardiac outputs were assessed at three different end-tidal concentrations of isoflurane (1 · 0, 1 · 3 and 2 · 0%).ResultsCorrelation between Doppler and thermodilution cardiac output (r(2)  = 0 · 582) and between minute distance and thermodilution cardiac output (r(2)  = 0 · 658) were moderately good, but the limits of agreement between Doppler and thermodilution cardiac outputs were above the recommended values (±39%, for a recommended value up to 30%).Clinical SignificanceDoppler and minute distance cannot be considered as an alternative method to thermodilution to monitor cardiac output in the healthy anaesthetised dog.© 2015 British Small Animal Veterinary Association.

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