IndraLab

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"Mutations in the Na v 1.5-encoding SCN5A gene account for> 75% of BrS genotype positive cases, although the yield of SCN5A testing for clinical cases is only = ~ 25% to 30%.5 In the presence of the previously described changes in ion currents, particularly I Na reduction, the net repolarizing effect of I to during phase 1 is significantly enhanced, thus reducing cell voltage to values below those required to activate L-type Ca ++ channels."