Most common ASD in down syndrome is?

Most common ASD in down syndrome is
?
a) Ostium primum
b) Ostium secundum
c) Absent atrial septum
d) Sinus venosus
Correct Answer - A
Ans. is ‘a’ i.e., Ostium primum
About 40% children with down syndrome have congenital heart
disease.
Endocardial cushion defect (ASD with ostium primum) account for
40-60% of cases.