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Atrial high-rate episode detected by a dual-chamber pacemaker and the corresponding intracavitary electrogram. (A) Electrogram of a dual-chamber pacemaker (Abbott). AF, atrial fibrillation; AMS, atrial mode switch episode; AR, atrial signal in the refractory period; AS, atrial sensing; AT, atrial tachycardias; VS, ventricular sensing; VPP, ventricular backup pacing. (B) Electrogram and plot of a dual-chamber pacemaker (Medtronic).
