Atrial septal defect
![Atrial septal defect](/TransAdam/doc/graphics/images/en/18119.jpg)
Atrial septal defect
An atrial septal defect is a congenital heart defect where the wall between the right and left atria does not close properly, leaving a hole between the two atria.
Content is best viewed in IE9 or above, Firefox and Google Chrome browser.