Abstract
SCN5A overlap syndromes are clinical entities that express a phenotype combining aspects of different canonical SCN5A-related arrhythmia syndromes or a variable arrhythmic phenotype among individuals carrying the same SCN5A mutation. Here we review the literature addressing SCN5A overlap syndromes as well as the principal mechanisms currently proposed. Among others, a multifactorial determination encompassing an interaction between SCN5A variant(s), other genetic polymorphisms, and possibly environmental factors seems the most plausible hypothesis.
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