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Atrial septal defect (ASD)

The atrial septum is the wall of tissue and muscle between the upper two chambers (atria) of the heart. An atrial septal defect (ASD) is a hole in this wall. 

A hole or defect such as this allows both upper chambers of the heart (atria) to communicate and permits an abnormal flow of blood from one chamber to the other. 

More information for parents about atrial septal defect (ASD)

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