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defined Atrial Septal Defects (ASD)

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The atrial septal defects consti­tute a common variety of CHD. Inci­dence of ASD has been reported to be 6/1000 live births. Females are more frequently affected than males. Atrial septal defect has been found to be as­sociated with most of the autosomal and sex chromosome aberrations and is a common accompaniment of trisomies including trisomy 18 and trisomy 21.
There are three clinically signifi­cant types of atrial septal defects:
i) Osteum secundum defect.
ii)  Endocardia!  cushion defect
with osteum primum defect.
iii) Complete failure of formation
of interatrial septum leading to a
common atrium.
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