Figure 4. The PVAC and the PVAC Gold positioned in the pulmonary veins. PVAC Gold (9 electrodes) is positioned in the lateral, PVAC (10 platinum electrodes) in the septal pulmonary veins. Note the overlap between poles 1 and 10 of the PVAC in the right inferior vein and a „safe” interelectrode distance in the right superior vein (arrows). See text for explanation.