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Figure 2 Typical surface P waves at baseline (A), after zone 1 ablation (B), after ablation of zones 1 and 2 with incomplete interatrial conduction block (C) and after ablation of zones 1 and 2 with incomplete interatrial conduction block (D). ra = component of P-wave associated with right atrial activation; la = component of P-wave associated with left atrial activation.
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