SCN1B and sudden infant death syndrome: SCN1B variants are also linked to inherited cardiac arrhythmia syndromes that increase the risk of sudden death, including BrS (Hu et al., 2012), LQTS (Riuró et al., 2014), atrial arrhythmias (Watanabe et al., 2009), and SIDS (Hu et al., 2012).