Abstract
A 6-year-old male India-origin Rhesus macaque (Macaca mulatta) presented with thin body condition and muscular atrophy. Thoracic auscultation revealed a grade VI/VI pansystolic murmur bilaterally. Radiographs showed cardiomegaly with significant left atrial and biventricular enlargement, a dilated pulmonary artery, and hepatomegaly. Electrocardiogram revealed a normal sinus rhythm interspersed with ventricular bigeminy. Hematology showed mild polycythemia and prerenal azotemia. Necropsy demonstrated double-outlet right ventricle with a large subaortic ventricular septal defect, subpulmonary stenosis, small atrial septal defect, and right ventricular hypertrophy. The major histological finding was severe chronic passive hepatic congestion. Double-outlet right ventricle is a rare congenital heart disease, both in human beings and animals.
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