Atrial septal defect (ASD) is a type of congenital heart defect that affects the wall separating the two upper chambers of the heart, called the atria. This wall, called the atrial septum, is supposed to prevent oxygen-rich blood from the lungs from mixing with oxygen-poor blood from the body. In a person with ASD, there is a hole in the atrial septum that allows blood to flow between the atria. This can cause an increase in blood flow to the lungs and make the heart work harder than normal.

Files included: aorta, aortic valve, arteries, heart, valves

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