An atrial septal defect (ASD) is a hole in the wall between the heart’s two upper chambers. ASD is a congenital condition, which means it is present at birth. A ventricular septal defect (VSD) is a hole in the wall between the two lower chambers. In children, a VSD is usually congenital.
A very small hole in the heart may not cause any issues. However, a large hole is usually diagnosed soon after birth because it causes symptoms, Barnes says. “Most ventricular septal defects are picked up by pediatricians when they do newborn exams. ASDs can be more difficult because they don’t always have easy symptoms to look for.”