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Figure 1 Circumferential pulmonary vein ablation. Shown is a posteroanterior projection of a 3-dimensional construction of the left atrium and the pulmonary veins (PV). Red tags indicate ablation sites. The PVs were encircled 1 to 2 cm from their ostia, with additional ablation lines in the mitral isthmus and roof. LI = left inferior; LS = left superior; RI = right inferior; RS = right superior.
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