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Figure 3 Freedom from all symptomatic atrial fibrillation (AF) in each randomized pacing mode in study population receiving concomitant class 1 or 3 antiarrhythmic drugs with frequent (weekly events to two events in three months) AF at baseline. Dual right atrial (RA) pacing shows prolongation of time interval to AF recurrence as compared with high RA or support pacing in these patients.