Current address: School of Animal and Veterinary Sciences, Charles Sturt University, Wagga Wagga, New South Wales, 2678, Australia.
Mitral valve and tricuspid valve dysplasia in a 9-week-old Standardbred colt
Article first published online: 9 APR 2012
© 2012 EVJ Ltd
Equine Veterinary Education
Volume 25, Issue 7, pages 339–344, July 2013
How to Cite
Duz, M., Philbey, A. W. and Hughes, K. J. (2013), Mitral valve and tricuspid valve dysplasia in a 9-week-old Standardbred colt. Equine Veterinary Education, 25: 339–344. doi: 10.1111/j.2042-3292.2012.00392.x
- Issue published online: 3 JUN 2013
- Article first published online: 9 APR 2012
- mitral valve dysplasia;
- tricuspid valve dysplasia;
- congestive heart failure;
- atrial fibrillation
A 9-week-old Standardbred colt was presented for investigation of dull demeanour, exercise intolerance and heart murmurs. Cardiac auscultation revealed a grade 5/6 holosystolic murmur and a grade 5/6 pansystolic murmur over the left and right cardiac apex respectively, and an irregularly irregular cardiac rhythm. Electrocardiographic examination findings were consistent with atrial fibrillation and tachycardia. Echocardiographic examination identified marked atrioventricular regurgitation and atrial dilation bilaterally, thickening of the mitral and tricuspid valves and dilation of the pulmonary artery consistent with pulmonary hypertension. No ventricular or atrial septal defect was present. Cardiomegaly and diffuse pulmonary oedema were evident on examination of lateral thoracic radiographs. Dysplasia of the mitral and tricuspid valves, eccentric cardiomegaly and pulmonary oedema were confirmed by post mortem examination. Dysplasia of the atrioventricular valves represents a rare cause of biventricular failure in the horse.