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Figure 1 An "en face" view of the interatrial septum (IAS) before (A, B) and after (C, D) pacemaker lead implantation. The fossa ovalis (FO) is clearly visible in both situations. Arrows (A, B) show the selected spot for pacing of the IAS. A virtually perfect positioning of the atrial lead was achieved in this case, as the arrow on panels C and D indicate the cross-section of the atrial lead in front of the anterior-superior edge of the muscular interatrial septum and the membrane of FO. The achieved spot is identical to the desired spot shown by two-dimensional and three-dimensional images.
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