Reference : Exercise and pharmacological stress echocardiography in healthy horses
Scientific journals : Article
Life sciences : Veterinary medicine & animal health
http://hdl.handle.net/2268/10028
Exercise and pharmacological stress echocardiography in healthy horses
English
Sandersen, Charlotte [Université de Liège - ULg > Département clinique des animaux de compagnie et des équidés > Département clinique des animaux de compagnie et des équidés >]
Detilleux, Johann [Université de Liège - ULg > Département de productions animales > Génétique quantitative - Epidémiologie et santé publique >]
Art, Tatiana mailto [Université de Liège - ULg > Département de sciences fonctionnelles > Phys. neuro-muscul., de l'effort - Méd. sport. des animaux >]
Amory, Hélène [Université de Liège - ULg > Département clinique des animaux de compagnie et des équidés > Médecine interne des équidés >]
2006
Equine Veterinary Journal. Supplement
Equine Veterinary Journal Ltd
37
159-162
Yes (verified by ORBi)
International
0425-1644
Newmarket Suffolk
United Kingdom
[en] exercise ; horses
[en] REASONS FOR PERFORMING STUDY: Stress echocardiography could be a useful diagnostic test in horses suspected to suffer from exercise-induced myocardial dysfunction as a cause of exercise intolerance. OBJECTIVE: To evaluate the effect of treadmill exercise and pharmacological stress test on left ventricular echocardiographic parameters. METHODS: Echocardiography was performed in 2 groups of 5 healthy horses, either immediately after a near-maximal treadmill exercise (Group EXE) or during a pharmacological challenge (Group DOB) consisting of 35 microg/kg atropine, followed by incremental dobutamine infusion rates of 2-6 microg/kg bwt/min for 5 min duration each, which led to a cumulative dobutamine dose of 100 microg/kg. Left ventricular M-mode parameters were compared at rest and at heart rates of 80, 100, 110, 120 130, and 140 beats/min, within each group. RESULTS: In 2 horses of Group EXE, echocardiographic measurements were impossible at 140 and 130 beats/min, as their heart rates dropped too fast in the immediate post exercise period. In the remaining 3 horses image quality was not always satisfactory at heart rates of 130 and 140 beats/min. Systolic left ventricular parameters and fractional shortening measured at 130 and 140 beats/min were significantly different from values obtained at lower heart rates. Horses in Group DOB reached expected heart rates of 80 and 100 beats/min, after the administration of atropine and during a dobutamine infusion rate of 2 microg/kg bwt/min, respectively. Heart rates targets of 110, 120, 130, and 140 beats/min were reached at mean (+/- s.d.) dobutamine infusion rates of 2.8 +/- 0.4, 3.2 +/- 0.4, 4.0 +/- 0.7, 5 +/- 0.7 microg/kg bwt/min, respectively. Systolic left ventricular parameters and fractional shortening at heart rates of 110, 120, 130, and 140 beats/min, were significantly different from values obtained at lower heart rates. CONCLUSION: The pharmacological stress test induced changes in ventricular dimensions at heart rates of 80 to 140 beats/min. Using this test, high quality images can easily be obtained at heart rates of 140 beats/min. Conversely, in post exercise echocardiography, obtaining good quality images at heart rates of 130 and 140 beats/min is difficult, which limits use of the technique in routine clinical settings. POTENTIAL RELEVANCE: Further studies should demonstrate the potential of pharmacological stress test as a diagnostic tool in horses suffering from exercise-induced myocardial dysfunction.
Researchers ; Professionals
http://hdl.handle.net/2268/10028

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