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Figure 1 Comparisons of electrophysiologic characteristics of AF episodes originating from proximal and distal portions of PVs (PV-P, PV-D; [A]), RSPV and LSPV (B), superior and inferior PVs (C) and PVs and SVC (D). AF = atrial fibrillation; AF1 = first cycle length of AF episodes; CI = coupling interval of the first ectopic beat just before the onset of AF; CL = cycle length; LSPV = left superior pulmonary vein; Mean CL = mean cycle length of 15 beats before onset of AF; PI = prematurity index; PV = pulmonary vein; PV-D = pulmonary vein-distal; PV-P = pulmonary vein-proximal; RSPV = right superior pulmonary vein; SVC = superior vena cava.
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