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Figure 3 Algorithm for determining pulmonary vein (PV) origin. The first two criteria (a positive P-wave in lead aVL, higher amplitude of P-wave in lead I greater than 50 µV) and the third criterion (notched shape in lead II) indicate right and left PV origin, respectively with high specificities. Remaining cases are differentiated into right or left according to the amplitude ratio of leads II and III (III/II ratio) or the duration of positive phase in V1. For both right and left veins, P waves taller than 100 µV suggest a superior PV origin. *During pacing/ectopy but absent in sinus rhythm; in the presence of notch in sinus rhythm, go to "No."