There are new techniques that are percutaneous to place a device to close the hole but they are only used for small ASDs and there is a possibility of a persistent residual hole. If the ASD is large, surgery is the best option to permanently close the hold with few complications. Discussion with an experienced pediatric cardiologist is important to determine how big and the what timing of intervention is needed for your child.
If he ultimately needs one, his doctor will place him on a transplant list which has many factors to determine a possible match for him. Only after he has surgery, will they determine if accepts the transplant.