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Title: Echocardiographic studies of valvular and ventricular function in horses
Author: Long, K. J.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1993
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This thesis evaluates echocardiography in the assessment of the equine heart. Echocardiography is employed extensively in human medicine to differentiate the origin of cardiac murmurs and to assess ventricular performance. Such a noninvasive method would be valuable in equine medicine where routine diagnostic techniques, used successfully in other species, are of little value. Publications concerning the origins of cardiac murmurs, the indications for echocardiography in human medicine, and the limited studies on echocardiography in horses have been reviewed. The aims of Part 1 of this work were to standardise suitable images for two-dimensional, M-mode and Doppler echocardiography; to measure selected intracardiac dimensions from the standardised two-dimensional and M-mode images; and to record blood flow velocities from the heart and great vessels using Doppler echocardiography in a group of normal horses and in horses with valvular disease. Eighteen standard images were defined. All but two of the images could be recorded within a narrow range of transducer location, rotation and angulation. Selected intracardiac dimensions were measured from M-mode studies derived from the standard two-dimensional images. Measurements of intracardiac dimensions were repeatable and were not significantly correlated to bodyweight or age. Horses with suspected aortic regurgitation had a significantly larger left ventricular internal dimension in diastole, measured from the right hemithorax, than normal horses. Although other significant differences were detected between groups, intracardiac dimensions were not sufficiently sensitive to differentiate horses with suspected valvular disease from normal horses. Colour flow Doppler studies revealed that valvular regurgitation was present in many normal horses. Horses with murmurs indicating tricuspid and aortic regurgitation showed larger regurgitant signals at the tricuspid and aortic valves respectively, than normal horses. Horses with murmurs indicating mitral regurgitation had a regurgitant signal of longer duration than that of the control group, but the size of the jet was not significantly different between groups.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available