SCN5A and sick sinus syndrome: Mutations in the SCN5A gene, for instance, are also found in patients with Brugada syndrome, cardiac conduction defects, sudden infant death syndrome, arrhythmogenic right ventricular cardiomyopathy, and sick sinus syndrome (Makita, et al., 2005; Miyoshi, et al., 2005; Priori, et al., 2002; Priori, et al., 2000).