“…The combination of structural abnormalities and reduced sodium channel function (either pharmacologically or genetically) may lead to current-to-load mismatch that both explains the Brugada sign and the arrhythmogenesis (Hoogendijk et al, 2010b).) There is increasing evidence that the RVOT subepicardium has a different structural and functional make-up (less sodium channel expression, less Cx43 expression, more fibrosis) than the RVOT subendocardium, also in patients without BrS (Ten Sande et al, 2015) and in healthy animals (Boukens et al, 2013). This leads to fractionated electrograms at the epicardium and not at the endocardium of patients with BrS (Nagase et al, 2002).…”