A "hole" in the wall that separates the top two chambers of the heart.
This defect allows oxygen-rich blood to leak into the oxygen-poor blood chambers in the heart. ASD is a defect in the septum between the heart's two upper chambers (atria). The septum is a wall that separates the heart's left and right sides.
What cause it?
How does it affect the heart?
How doe the ASD affect your child ?
Can ASD be repaired?