Abstract:Heterozygous carriers of the E161K mutation in the SCN5A gene, which encodes the Na V 1.5 pore-forming αsubunit of the ion channel carrying the cardiac fast sodium current (I Na), show sinus node dysfunction. We assessed the mechanism by which the E161K mutation causes sinus bradycardia and reduces atrial excitability, as well as the potential role of the common H558R polymorphism. To this end, we incorporated reported mutation-induced changes in I Na into the recently developed Fabbri-Severi model of a single… Show more
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