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Figure 1 (A) Freedom from crossover within 4.5 months of entering randomized treatment phase for each pacing mode. The percentage of patients surviving in the mode is tabulated on the Y-axis and the follow-up duration in the mode on the X-axis. Dual right atrial (RA) pacing shows a higher proportion of patients able to remain in the randomized treatment mode as compared with other modes. Dual, dual-site RA pacing; single, high RA pacing; support, demand pacing in atrium or ventricle at low support rate. (B) Freedom from all symptomatic atrial fibrillation (AF) in each randomized pacing mode in the entire study population. Dual RA pacing but not high RA pacing shows a trend to prolongation of time interval to AF recurrence.
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