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Kids' Health
http://kidshealth.org/parent/medical/heart/asd.html#cat141
An atrial septal defect (ASD) — sometimes referred to as a hole in the heart — is a type of congenital heart defect in which there is an abnormal opening in the dividing wall between the upper filling chambers of the heart (the atria).
In most cases ASDs are diagnosed and treated successfully with few or no complications...