Aorticopulmonary Septal Defect in a German Shepherd Dog

A 2-year-old, female German shepherd dog was referred with a 2-month history of dyspnea, ascites, and anorexia. On physical examination, an arrhythmia, tachypnea, and a continuous grade V/VI heart murmur were evidenced. Atrial fibrillation and tall R waves were noted on electrocardiography. Survey thoracic radiography revealed generalized cardiomegaly and enlarged pulmonary vessels. Echocardiography demonstrated severe dilatation of the left atrium and ventricle with reduced fractional shortening. Doppler echocardiography showed continuous and turbulent flow in the ascending aorta between the aorta and the pulmonary artery. Necropsy demonstrated an aorticopulmonary septal defect.