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Figure 3 Ectopic P-wave morphology before (A) and after (B) QRST subtraction. The subtracted ectopic P-wave morphology shows prominent positive P-wave in lead I and high-amplitude ( 100 µV) P-wave in lead II, with the amplitude ratio of lead III/II <0.8. Though this suggests right superior PV as the source of ectopy, comparison with PV pacemapping from left superior pulmonary vein (PV) (C) and right superior PV (D) indicates a 12/12-lead match with left superior PV pacing. Ectopics were eliminated by the disconnection of left superior PV.
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