Hi. The direction and size of the shunting are determined by the size of the defect and compliance of the ventricles. A small defect less than 0.5 cm (5 mm) in diameter is associated with a small shunt and no significant sequelae. On the other hand, a larger defect (more than 2 cm or 20 mm) in diameter may be associated with a large shunt and blood flow changes. ASD may not require treatment if there are few or no symptoms, or if the defect is small. Surgical closure of the defect is recommended if the defect is large, the heart is swollen, or symptoms occur. To know more about ASD, consult your pediatric cardiologist. Hope this answers your question.
My son is 4 days old and has a 6mm hole in the heart(ASD). This was found after carrying out ECHO test. Doctor advised that it would close on its own and there is no issue. Can somebody please advise in this regard (detailed explanation will help us)? I had searched in the net regarding my issue and most of the cases the hole did not close.