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Figure 3 Kaplan-Meier plots of freedom from atrial fibrillation during follow-up. Atrial fibrillation was diagnosed only by standard 12-lead electrocardiogram at planned follow-up visits, not in-between these visits. AAIR = single lead atrial pacing; DDDR-l = dual-chamber pacing with the pacemaker programmed with a fixed atrioventricular (AV) delay of 300 ms; DDDR-s = dual-chamber pacing with the pacemaker programmed with a rate-adaptive AV delay 150 ms and ventricular capture.