Merck Manual

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Atrial septal defect, dog, echocardiogram
Atrial septal defect, dog, echocardiogram

Echocardiographic image of a secundum-type atrial septal defect (ASD) in a dog. RA = right atrium, LA = left atrium, RV = right ventricle, LV = left ventricle.

Courtesy of Dr. Sandra Tou.