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Figure 1 Patient 1: intracardiac recordings during grafted right atrial sinus rhythm (upper panel) and recipient sinus rhythm (lower panel). In both cases the other atrium follows the dominant one. When the grafted sinus rhythm is dominant, the P wave is almost flat, its end is not discernible and the PR interval is 140 ms. On the other hand, when the recipient sinus rhythm takes over, the P wave and PR interval are tremendously distorted and prolonged (280 and 312 ms, respectively). RRA = recipient right atrium, GRA = grafted right atrium.
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