ASD: Atrial Septal Defect – Definition
An atrial septal defect is a hole between the two top chambers of the heart. It means that the wall (septum) didn’t close all the way, so blood that just came from the lungs mixes with blood that still needs oxygen. This extra flow makes the right side of the heart and the lungs work harder.

Some holes are tiny and close by themselves as a baby grows, and people never feel anything. But bigger holes can make you feel tired, short of breath, or get chest infections. Doctors check how big the hole is and might just watch it or give medicines. Sometimes they close the hole using a special umbrella device through a tube or do surgery to sew it shut.
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