Sudden cardiac death (SCD) accounts for ∼50% of total cardiovascular mortality and 10–20% of all deaths.1 Most of the SCDs (70–80%) are caused by coronary artery disease (CAD), whereas non-ischaemic myocardial diseases account for approximately one-fifth of the cases, and the minority is caused by other cardiac conditions (e.g. primary arrhythmia syndromes, valve diseases, or myocarditis).2,3 Although treatments of CAD have improved significantly and led to declined age-adjusted mortality4 in the current era, the overall incidence of SCD has remained relatively stable.