A heterogeneous collection of cardiac rhythm disorders caused by genetic variations in the SCN5A gene with autosomal dominant inheritance. Affected individuals are commonly reported to have unremarkable cardiac morphology and at least one cardiac rhythm phenotype that includes, but is not limited to, atrial fibrillation, sick sinus syndrome, progressive cardiac conduction disease, ventricular fibrillation, long QT syndrome, and Brugada syndrome. The disease is SCN5A-related cardiac rhythm disorder (Monarch Disease Ontology identifier MONDO_1010181).