The Atrial Septum is the wall between the left and right atria (upper chambers) of the heart. A hole in that wall is called an ASD. In the presence of this defect, pure and impure blood can mix together over time, cause medical problems and arrhythmias.
Sometimes, an ASD can be closed without open-heart surgery. First, the surgeon makes a tiny cut in the groin. Then the surgeon inserts a wire into a blood vessel that goes to the heart. Next, two small umbrella-shaped “clamshell” devices are placed on the right and left sides of the septum. These two devices are attached to each other. This closes the hole in the heart..
Open-heart surgery may also be done to repair ASD. In this operation, the septum can be closed using stitches. Another way to cover the hole is with a patch.