In exams like NEET SS questions on ASD and VSD are common. Most cardiac surgery questions are here
Q) Most common ASD is
a) Ostium Primum
b) Ostium Secundum
C) Sinus Venosus
d) All are equal
ASDs ■ Common defects Ostium secundum: fossa ovalis defect (approximately 70 per cent of ASDs) Ostium primum: atrioventricular septal defect (approx imately 20 per cent of ASDs) Sinus venosus defect: often associated with anomalous pulmonary venous drainage (approximately 10 per cent of ASDs)
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