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N Z Vet J. 1991 Sep;39(3):97-8.

Common atrioventricular canal in a foal.

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Department of Veterinary Clinical Sciences, University of Sydney, NSW, Australia.


A 3-week-old Thoroughbred colt was presented for weakness and cyanosis. A pansystolic regurgitant murmur and other physical findings suggested that the foal developed pulmonary oedema as a consequence of congenital heart disease. A large atrial septal defect, a high ventricular septal defect and dysplasia of the atrioventricular valves were visualised echocardiographically. A persistent common atrioventricular canal was observed at necropsy.

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