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Figure 4 Prevalence of the electrical breakthroughs in anatomic segments of each pulmonary vein (PV). Each breakthrough was fluoroscopically classified into four segments around the ostium of the PV (top, bottom, anterior and posterior). The numbers described around each PV perimeter represent the prevalence of breakthrough in these four anatomic segments (100% means that the breakthrough was observed in that segment in all PVs ablated). Distribution of breakthrough varied significantly (p < 0.01) from one anatomic segment to another and also between superior and inferior veins. LIPV = left inferior pulmonary vein; LSPV = left superior pulmonary vein; RIPV = right inferior pulmonary vein; RSPV = right superior pulmonary vein.
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