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It has been shown that If channels can be found in AV node, apart from the sinus node. Previous animal studies showed that If inhibitor resulted in the rate-dependent reduction in AV node conduction during atrial fibrillation (AF). Therefore, we aimed to examine the effect of ivabradine on ventricular rate in patients with non-paroxysmal AF.This study was a prospective randomized, double blind, placebo-controlled...