73yo male with unremakrable symptom. Patient had no know his | Figure 1

73yo male with unremarkable symptom. Patient had no known history of heart disease. On physical examination, pulse rate tended to bradycardia. This ECG showed irregular rhythm with visible p waves preceding QRS. At first I was thinking this is Multifocal atrial tachycardia, but then I realized the HR was not tachycardia. Wandering pacemaker should be a regular rhythm right? Can someone help me interpret this ECG?

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