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Survival decreases with reducing biventricular (BiV) pacing in an observational analysis of 36,935 patients with cardiac resynchronization therapy defibrillators. A: Survival analysis by biventricular pacing percentage. B: Survival analysis by biventricular pacing percentage and by the presence of significant atrial fibrillation (AFib), defined as average daily burden >0.5%. Reproduced with permission from Hayes et al 2011.
