For Atrial Septal Defect we have terms and definitions in 3 topics. The topics are Horse Health, Medical and Surgery.

Rare congenital defect characterized by the presence of a hole in the wall or septum separating the left and right atria of the heart.
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A hole located in the wall between the two upper chambers of the heart
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The septum is a wall that separates the heart's left and right sides. Septal defects are sometimes called a "hole" in the heart. A defect between the heart's two upper chambers (the atria) is called an atrial septal defect (ASD).
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