Figure 3From: Three-dimensional transesophageal echocardiography of the atrial septal defectsA right-frontal view of the same defect. Locations of 5 sections of atrial septal defect rims proposed by Mathewson and co-workers8 are labeled. S:superior; AS: anterosuperior; PS: posterosuperior; I: inferior; PI: pos teroinferior. SI: superoinferior. TA: Tricuspid annnulus..Back to article page