Epidemiology
As a group, atrial septal defects are detected in 1 child per 1500 live births. PFO are quite common (appearing in 10–20% of adults) but asymptomatic and therefore undiagnosed. ASDs make up 30 to 40% of all congenital heart diseases that are seen in adults.
The ostium secundum atrial septal defect accounts for 7% of all congenital heart lesions. This lesion shows a female preponderance, with a male:female ratio of 1:2.
Read more about this topic: Atrial Septal Defect