Classification of
Classification of atrial septal defect
There are several morphologic variants of this defect. (53)
ASD are classified according to their embryogenesis and make up more than 80% of cases .
1-Ostium secundum
2-Ostium primum
3-Sinus venosus
4-coronary sinus
The most common type of ASD is the ostium secundum generally occurs in isolation. It is located centrally in the atrialseptum. The ostium primum ASD, is the second most common type.(54)