<unk>  septal<unk> s are the most common form of congenital heart disease, accounting for 20-40% of all congenital heart disease cases in adults.  The Centers for Disease Control and Prevention (CDC) estimated that each year about 1,966 babies in the United States are born with an<unk>  septal<unk> .Atrial septal<unk> s can be classified into : ostium secundum, ostium primum, sinus venosus, coronary sinus ASDs and common or single atrium<unk> s. Collectively,<unk>  septal<unk> s account for 10% of all congenital heart disease. Infants and adolescent patients may be asymptomatic until later in life. By 40 years of age, approximately 90% of untreated<unk>  septal<unk>  patients will experience an onset of symptoms.
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