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Gain-of-function K(+) channel mutations cause familial atrial fibrillation (AF) by shortening of the atrial action potential duration (APD). APD-prolonging K(+) channel blockers are an effective therapeutic option in AF. In vitro, the dominant negative Kv4.2W362F mutation (Kv4DN) eliminates I(to,f) in murine atrial myocytes and markedly prolongs the APD, so whether this loss-of-function of I(to,f) alters the atrial effective refractory period (AERP) in vivo and/or affects AF-inducibility was investigated in the present study.

In Vivo Effect of a Dominant Negative Kv4.2 Loss-of-Function Mutation Eliminating Ito,f on Atrial Refractoriness and Atrial Fibrillation in Mice