Doppler echocardiography and Tissue Doppler Imaging in the healthy rabbit: Differences of cardiac function during awake and anaesthetised examination

• Published in: International journal of cardiology Vol. 115; no. 2; pp. 164 - 170
• Main Authors: Stypmann, Jörg, Engelen, Markus A, Breithardt, Anne-Kristin, Milberg, Peter, Rothenburger, Markus, Breithardt, Ole A, Breithardt, Günter, Eckardt, Lars, Cordula, Poulsen Nautrup
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier Ireland Ltd 07.02.2007; Elsevier Science
• Subjects: Anaesthesia; Anesthesia; Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy; Animals; Awake; Biological and medical sciences; Cardiology. Vascular system; Cardiovascular; Cardiovascular system; Echocardiography; Echocardiography, Doppler; Female; General anesthesia. Technics. Complications. Neuromuscular blocking. Premedication. Surgical preparation. Sedation; Heart - physiology; Investigative techniques, diagnostic techniques (general aspects); Male; Medical sciences; Narcosis; Rabbit; Rabbits; Tissue Doppler Imaging; Ultrasonic investigative techniques; Ultrasonography, Doppler; Wakefulness; Anaesthesia; Rabbit; Echocardiography; Tissue Doppler Imaging; Narcosis; Awake; Sonography; Cardiac performance; Tissue doppler; Lagomorpha; Duplex ultrasonography; Phlebology; Vertebrata; Mammalia; Animal; Medical imagery; Anesthesia; Circulatory system; Cardiology; Comparative study
• ISSN: 0167-5273; 1874-1754
• DOI: 10.1016/j.ijcard.2006.03.006

Abstract Objective In the past years, Doppler echocardiography has evolved into a commonly used technique. More recent sophisticated advances in imaging quality have substantially improved spatial and temporal resolution allowing the adaptation of this technique to small animal models, particularly in rabbits but even in mice. Recently, parameters obtained by Tissue Doppler Imaging (TDI) have been shown to be more independent of pre- and afterload than classic hemodynamic Doppler measurements. Exploration of animal models may require anaesthesia but there is only very little information on the effect of anaesthesia on echocardiographic parameters in rabbits. Methods We therefore performed Doppler-echocardiographic examinations of 20 wild-type New Zealand White rabbits in awake state and under light ketamine–xylazine anaesthesia. Special focus was put on the evaluation of global and regional left ventricular systolic and diastolic function using TDI and the myocardial performance index (Tei-index). Results Doppler-echocardiographic measurements including TDI in rabbits were feasible to assess cardiac morphology and function within a short examination time. There were some distinct changes of functional parameters during anaesthesia. Exemplary for systolic function, fractional shortening, cardiac output and systolic TDI velocity of the lateral wall decreased distinctly. Global left ventricular function measured by the Tei-index deteriorated. Conclusions Doppler echocardiography and TDI can be performed easily, quickly and safely in the rabbit. Anaesthesia with the cardiodepressive ketamine–xylazine shows some distinct Doppler-echocardiographically measurable negative effects on cardiac function. Thus, echocardiography with less cardiodepressive anaesthetic regimes or even without anaesthesia after training of the animals should be considered as alternatives whenever possible.