Original Article: http://www.mayoclinic.com/health/medical/IM02047
- Slide show: Common types of congenital heart defects
Ebstein's anomaly is a rare heart defect in which the tricuspid valve — the valve between the upper right chamber (right atrium) and the lower right chamber (right ventricle) of the heart — doesn't work properly. As a result, blood leaks back through the valve and into the right atrium. Atrial septal defect (labeled patent foramen ovale) is a hole between the two upper chambers of the heart. About half the people with Ebstein's anomaly have an atrial septal defect.