Atrial septal defect secondary hole 0.3cm serious?

Atrial septal defect

(ASD) is one of the most common congenital heart diseases, accounting for 20% to 30% of all congenital heart diseases. ASD can occur alone or in combination with other types of cardiovascular malformations, and is more common in women. ASD can be divided into primary ASD and secondary ASD according to the location of the defect, of which secondary ASD is the most common.