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Incidence of AF episode of 48 hours or longer. Curves reflect unadjusted Kaplan‐Meier estimates of cumulative incidence of developing 48 hours of AF in patients programmed to aCRT (blue line) and standard CRT (red line) through 36‐month follow‐up. Unadjusted hazard ratio derived from data through 36 months for each cohort using Frailty survival regression models. AF, atrial fibrillation; CRT, cardiac resynchronization therapy; HR, hazard ratio
