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Figure 8 Patient 2: pace mapping of atrioatrial conduction. Left panel: The pacing electrode is in the low recipient atrium. In the inferior leads a negative P wave is followed by an isoelectric component that precedes a positive P wave. The time separating the pacing artifact from the resulting grafted P wave is 180 ms. This suggests that the paced impulse had to first depolarize the recipient right atrium in an ascending fashion. After a delay due to slow conduction at an upper right atrial site, depolarization of the grafted right atrium then ensued descendingly. Right panel: the pacing electrode is now in the high recipient atrium close to the suture line at the successful ablation site. The resulting P wave follows the pacing spike without intervening initial negativity, and after a 50-ms delay.
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