Atrial septal defect (ASD) is a congenital heart defect in which blood flows between the atria (upper chambers) of the heart.
A hole in the septum between the heart's two upper chambers is called an atrial septal defect (ASD). A hole in the septum between the heart's two lower chambers is called a ventricular septal defect (VSD). ASDs and VSDs allow blood to pass from the left side of the heart to the right side. An atrial septal defect (ASD) is a hole in the part of the septum that separates the atria (the upper chambers of the heart). This hole allows oxygen-rich blood from the left atrium to flow into the right atrium instead of flowing into the left ventricle as it should. The ostium secundum atrial septal defect is the most common type of atrial septal defect, and comprises 6-10% of all congenital heart diseases. The secundum atrial septal defect usually arises from an enlarged foramen ovale, inadequate growth of the septum secundum, or excessive absorption of the septum primum. References. Atrial septal defects are a group of congenital heart diseases that enables communication between atria of the heart due to a deficiency in the interatrial septum. The inter-atrial septum is the tissue that separates the right and left atria from each other. The ostium secundum atrial septal defect is the most common type of atrial septal defect, and comprises 6–10% of all congenital heart diseases. The secundum atrial septal defect usually arises from an enlarged foramen ovale, inadequate growth of the septum secundum, or excessive absorption of the septum primum. A sinus venosus ASD is a type of atrial septum defect in which the defect in the septum involves the venous inflow of either the superior vena cava or the inferior vena cava. A sinus venosus ASD that involves the superior vena cava makes up 2 to 3% of all interatrial communication. An atrial septal defect (ASD) is an opening or hole in the wall that separates the two upper chambers of the heart. This wall is called the atrial septum. The hole causes oxygen-rich blood to leak from the left side of the heart to the right side.  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. Etiology. Atrial septal defect (ASD) is a congenital cardiac disorder caused by the spontaneous malformation of the interatrial septum. Ostium secundum ASD: This type of ASD results from incomplete adhesion between the flap valve associated with the foramen ovale and the septum secundum after birth. An atrial septal defect is a birth defect of the heart in which there is a hole in the wall (septum) that divides the upper chambers of the heart (atria). A hole can vary in size and may close on its own or may require surgery. An atrial septal defect is one type of congenital heart defect. Congenital means present at birth. As a baby develops during pregnancy, there are normally several openings in the wall dividing the upper chambers of the heart (atria). These usually close during pregnancy or shortly after birth. Atrial septal defect (ASD) is a congenital heart defect in which blood flows between the atria (upper chambers) of the heart. Normally, the atria are separated by a dividing wall, the interatrial septum. A sinus venosus ASD is a type of atrial septum defect in which the defect in the septum involves the venous inflow of either the superior vena cava or the inferior vena cava. A sinus venosus ASD that involves the superior vena cava makes up 2 to 3% of all interatrial communication.
http://pediatricct.surgery.ucsf.edu/conditions--procedures/atrial-septal-defect.aspx http://www.marmur.com/ASD-PFO.html https://en.wikipedia.org/wiki/Atrial_septal_defect http://www.aboutkidshealth.ca/en/healthaz/testsandtreatments/procedures/pages/atrial-septal-defect-closure-in-the-heart-catheterization-lab.aspx http://emedicine.medscape.com/article/162914-overview http://www.cdc.gov/ncbddd/heartdefects/AtrialSeptalDefect.html https://en.wikipedia.org/wiki/Atrial_septal_defect
what is atrial septal defect