and PR-segment depression are recorded in the first hours to days; Stage II: normalization of the ST and PR segments; Stage III: widespread T-wave inversion; Stage IV: normalization of the T waves.

PR segment depression can be a signal for pericarditis or atrial infarction. PR segment elevation occurs in lead aVR in the setting of pericarditis.

all of which are seen in about 50% of cases of pericarditis. Stage I (acute phase): Diffuse concave upward ST segment elevation in most leads, PR depression in most leads (may be subtle ...