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A 64‐year‐old man underwent implantation of a permanent His‐bundle pacemaker. A marked rise in the selective His‐bundle capture threshold was noted 1 month after the patient started flecainide acetate for rhythm control of recurrent, symptomatic atrial flutter and atrial fibrillation. The capture threshold subsequently normalized 4 days after discontinuing flecainide and switching to dofetilide. To...
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