1. Figure 1. The two major patterns of early repolarization
Figure 1. The two major patterns of early repolarization. Terminal QRS slurring (left) and notching (right) (arrows)

2. Figure 2. Schematic representation of the possible mechanism underlying J-wave occurrence. Action potentials from epicardium and endocardium
from normal individuals (left) and early repolarization (ER) patients (right) as well as the respective electrocardiograms are shown. A prominent
phase 1- notch and the loss of epicardial dome in phase-2 (red arrow) results in transmural dispersion of repolarization (dashed arrows) and appearance
of the J-wave and ST-segment elevation on the surface ECG. AP: action potential, ECG: electrocardiogram, ER: early repolarization, RP: resting potential AP
ECG
Normal individual ER patient
Endocardial AP
Epicardial AP RP
J- wave

3. (a) (b)
Figure 3. Characteristic electrocardiograms (ECGs) of Brugada type I (a) and type II (b)

4. Table 1. High-risk criteria from clinical and laboratory evaluation
Probable
Male gender
History of syncope
History of familial SCD
ER in inferior leads or global ER pattern
Terminal notching of QRS complex
J-wave amplitude >0.2mV
Possible
EPS
Genetic Testing
ECG markers of TDR
ECG: electrocardiogram, EPS: electrophysiological study, ER: early repolarization, TDR: transmural dispersion of repolarization