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Background: . An atrial septal defect (ASD) is a deficiency of the atrial septum. ASDs account for about 10-15% of all congenital cardiac anomalies .Types of ASDs:1-Ostium secundum defect?70% of ASDs.2-Ostum primum defect?20% of ASDs.3-sinus venosus defect.?10%of ASDs.4-coronary sinus septal defect? < 1% of ASDs ..
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