ECG characteristics of early repolarization
 - The ST segment elevations are concave and most pronounced in the chest leads. T-waves have high amplitude.
 - The hallmark of early repolarization is the end-QRS slurring or end-QRS notching (both may occur on the same ECG). The entire notch must be above the baseline. The slur must start before the baseline is reached. Refer to Figure 5, panel A.
 - The end-QRS slur and end-QRS notch are described with the terms Jonset, Jpeak, Jtermination (Figure 5, panel A). In case of chest pain, the level of ST segment elevation is measured in Jtermination.


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