Atrial Septal Defect

One of the most common adult congenital heart defects (CHD) is the atrial septal defect (ASD), which is a true, direct, and permanent communication between two atria. There are four major types of the ASD: ostium secundum, ostium primum, sinus venosus defect (superior and inferior types), and coronary sinus defect or unroofed coronary sinus (CS) [1, 2].