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Flecainide effect on the Nav1.5‐I141V mutant (A) representative traces showing the flecainide effect on the sodium current peak of Nav1.5 WT and p.I141V channels (B) averaged normalized WT and p.I141V tetrodotoxin‐sensitive window currents, obtained with a depolarizing‐voltage ramp (from −100 and +50 mV), were normalized to the peak current at −20 mV (Ipeak) and recorded in the same cell. Effect of the perfusion of 10 μM of flecainide on the sodium window current.
