AP, action potential ARI, activation-recovery intervals BrS, Brugada syndrome Brugada syndrome ECG, electrocardiogram EPS, electrophysiology study Electrocardiogram Genetic arrhythmic syndromes ICD, implantable cardioverter-defibrillator IHD, ischaemic heart disease Journal Article LBBB, left bundle branch block MAP, monophasic action potential MI, myocardial infarction PCA, principal component analysis RVOT, right ventricular outflow tract Review Risk stratification SAECG, signal-averaged electrocardiogram SCD, sudden cardiac death SNP, single-nucleotide polymorphism Sudden cardiac death VF, ventricular fibrillation VT, ventricular tachycardia WT, wavelet transform