ostium

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A 20-year review of ostium primum defect repair in children.
All patients with isolated ASD (ostium secundum, ostium primum and sinus venosus with or without PAPVD) were included.
Ostium primum defect, located in the lower part of atrial septum, is noted in approximately 15% of patients, while the sinus venosus defect constitutes only about five to 10%.