Example of Group 1 patient, with spontaneous Type 1 ECG BrS pattern (top panel on the left), who survived a previous CA. SAECG showed abnormal LPs (top panel on the right). Baseline epicardial mapping demonstrated a large area (15.1 cm²) of abnormal potentials (bottom panel). BrS, Brugada syndrome; CA, cardiac arrest; ECG, electrocardiogram; LAS, low-amplitude signal; LPs, late potentials; RMS, root mean square; SAECG, signal-averaged electrocardiogram.