Fig. 4.

Prevalence and arrhythmic risk associated with the appearance of ECG J waves and clinical manifestations of Brugada and early repolarization syndromes. Yellow highlighted region estimates the prevalence of the J-wave syndromes. J waves in the lateral ECG leads have a high prevalence but are associated with a very low arrhythmic risk in a relatively small fraction of the cohort of individuals displaying J waves. On the other extreme, J waves appearing globally in the ECG have a very low prevalence but are associated with a very high level of arrhythmic risk in a large fraction of the cohort presenting with J waves. Likewise, individuals displaying rapidly ascending ST-segment elevation have a high prevalence but low risk, whereas subjects resuscitated from cardiac arrest have a very low prevalence but the highest level of arrhythmic risk.