ostium

(redirected from Ostium primum)
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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.
Anatomically, atrial septal defects are classified into three main categories: ostium secundum, ostium primum, and sinus venosus defects.