SCN5A and familial dilated cardiomyopathy: The majority of studies that link the SCN5A gene to the occurrence of DCM demonstrate that this phenotype is usually associated with alterations in cardiac excitability (McNair et al., 2004; Ge et al., 2008; Nguyen et al., 2008; Gosselin-Badaroudine et al., 2012; Laurent et al., 2012; Mann et al., 2012; Shen et al., 2013; Beckermann et al., 2014).