SCN3A and cardiac arrhythmia: While SCN1A (Brownstein et al., 2018; Halvorsen et al., 2016) and SCN1B (Altshuler et al., 2012; Baruteau et al., 2017; Denti, n.d.; Neubauer et al., 2017) have strong prior associations with epilepsy, arrhythmia, and sudden death, and SCN4A (Männikkö et al., 2018) a recent association with sudden death, we additionally observed variants in the SCN paralogs SCN3A, SCN9A, and SCN10A that have yet to be conclusively associated with sudden death.