Most common type of Atrial septal defect is
Ostium primum
Ostium secundum
Cushion defect
Endocardial hyperophy
The atrial septal defect can occur in any poion of the atrial septum(secundum, primum or sinus venosus)OSTIUM SECUNDUM:Most common type of ASD accounts for 7% of al congenital hea disease.Defect situated at fossa ovalis.Associated with structurally normal atrioventricular (AV)valves.OSTIUM PRIMUM/ ENDOCARDIAL CUSHION DEFECT:Defect situated inferior to fossa ovalis.Associated with the cleft in AV valves.Most common cardiac lesion in Down&;s syndrome is endocardial cushion defect.
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