Figure 1.

Projection of the 192-unipolar electrode array on a schematic posterior view of the atria (left) and epicardial, unipolar potentials recorded during 5 s of sinus rhythm containing atrial deflections (A) and far-field ventricular signals (V). Typical examples of nine unipolar potentials obtained from the RA are shown outside the mapping array (right). BB, Bachmann’s bundle; ICV, inferior caval vein; LA, left atrium; LAA, left atrial appendage; PV, pulmonary veins; RAA, right atrial appendage; RA, right atrium; SCV, superior caval vein.