Atrial septal defect (ASD) is a type of heart defect which allows communication between the left and right side of the heart. These interatrial communications can result from defects in the interatrial septum but also from defects in the atrial connections of the systemic or pulmonary veins (sinus venosus or coronary sinus defects).
This is a companion discussion topic for the original article at https://patient.info/doctor/atrial-septal-defect-pro