Figure 1.
A normal anatomical heart is shown on the left side of the figure. Note that the tricuspid valve is slightly apical compared with the mitral valve. In a normal individual, this distance is less than 8 mm/m2 [1,2]. The heart pictured on the right of the figure is an example of a heart with an Ebstein anomaly. Note that the tricuspid valve is severely apically displaced and incompetent, resulting in severe tricuspid regurgitation and an enlarged right atrium. There is often persistent atrial communication, such as an atrial septal defect or patent foramen ovale.