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Figure 3 Double potentials (DPs) recorded along the ablation line in the cavo-tricuspid isthmus during coronary sinus pacing are depicted. Shown are examples of DPs in which the second component (larger bold arrows) had either a negative or positive polarity. The morphology of the second component was characterized by terminology used to describe QRS complexes. The smaller arrows indicate the first component of the DPs. St = stimulus channel.
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