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Figure 3 Patient 2: (A) Grafted atrial trigeminy due to regular capture by the recipient right atrium. (B) 1:1 conduction to the grafted right atrium during recipient incremental right atrial pacing at a cycle length of 500 ms. (C) Complete grafted-recipient atrioatrial dissociation during programmed stimulation of the grafted atrium with induction of common atrial flutter.