A congenital disorder characterized by the presence of a defect (opening) in the septum that separates the two atria of the heart.

Atrial septal defect (ASD) is a congenital abnormality of the interatrial septum that enables blood flow between the left and right atria via the interatrial septum.

The presence of a defect (opening) in the septum that separates the two atria of the heart. It can be congenital or acquired.

(heart septal defects, atrial) Developmental abnormalities in any portion of the ATRIAL SEPTUM resulting in abnormal communications between the two upper chambers of the heart. Classification of atrial septal defects is based on location of the communication and types of incomplete fusion of atrial septa with the ENDOCARDIAL CUSHIONS in the fetal heart. They include ostium primum, ostium secundum, sinus venosus, and coronary sinus defects.

An atrial septal defect (ASD) is an opening in the interatrial septum, causing a left-to-right shunt and volume overload of the right atrium and right ventricle. Children are rarely symptomatic, but long-term complications after age 20 years include pulmonary hypertension, heart failure, and atrial arrhythmias. Adults and, rarely,...

Atrial septal defect (ASD) is one of the more commonly recognized congenital cardiac anomalies presenting in adulthood. Atrial septal defect is characterized by a defect in the interatrial septum allowing pulmonary venous return from the left atrium to pass directly to the right atrium.

An atrial septal defect (ASD) is a hole in the wall (septum) between the two upper chambers of your heart (atria). The condition is present at birth (congenital).

Atrial septal defect, congenital opening in the partition between the two upper chambers (atria) of the heart. The most common atrial septal defect is persistence of the foramen ovale, an opening in this partition that is normal before birth and that normally closes at birth or shortly thereafter.