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Effects of sedation with acepromazine on echocardiographic measurements in eight healthy thoroughbred horses

¹ Department of Veterinary Clinical Sciences, Royal Veterinary College, Hawkshead Lane, Hatfield AL9 7TA

Eight normal thoroughbred horses were examined by echocardiography before and 10 minutes after they had been sedated by the intravenous administration of 0·03 mg/kg acepromazine. There were significant (P<0·025) increases in the diameters of the pulmonary artery and the aorta, measured at end-systole, and in the thickness of the interventricular septum, measured at end-systole and end-diastole. In addition, there was a significant (P<0·001) decrease in the diameter of the left atrium measured at end-diastole. The remaining cardiac dimensions, all the indices of cardiac function, and the occurrence and severity of valvular regurgitation were not affected by sedation.