The septum primum initially divides the two atria. As it advances toward the endocardial cushions, the gap preceding the septum is referred to as the ostium primum .

This Journal feature begins with a case vignette highlighting a common clinical problem. Evidence supporting various strategies is then presented, followed by a review of formal guidelines, when ...

An ostium primum atrial septal defect (ASD) occurs when then atrial septum near the atrioventricular valves has a communication between the two atrium causing a left to right shunt. This rarely ...

The device comes in two widths, 13 and 19 mm. Once implanted, the device expands within the tunnel, drawing the septum primum and the septum secundum into contact, leaving minimal material outside ...

Primum (20%) -- Usually a large defect, this variety develops if the primum septum does not merge with the endocardial cushions; a cleft of the anterior leaflet of the mitral valve is often ...

The septum of the heart is a wall of tissue that ... patent foramen ovale ostium secundum defect ostium primum defect sinus venosus defect coronary sinus defect If an ASD is minor, it often ...

The left atrial septal pouch, which occurs when the septum primum and septum secundum at the interatrial septum fail to completely fuse and is found in 30% to 35% of all adults, was first described ...

The primary atrial septum has normally developed, and the size and the histology of the nonfused superior and inferior AV endocardial cushions seem normal. An “ostium primum” is present ...

These defects are located high in the septum and are associated with an abnormality of the right upper pulmonary vein. Low defects, also called primum ASDs. This defect is positioned low in the ...