Among the common congenital acynotic heart diseases, ASDs are anatomically classified into four types: 1) Ostium secundum (85%), 2) Ostium primum (10%), 3) Sinus venosus (5%), and 4) Coronary sinus defects (rare).
All patients with isolated atrial septal defect (ostium secundum, ostium primum and sinus venosus with or without partial anomalous pulmonary venous connection) were included.
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