- Group 2: less common ECG changes (less than 5%) and need to be better evaluated to exclude cardiovascular diseases: T-wave inversion, ST-segment depression, pathological Q-waves, left atrial enlargement, QRS shift to the left, left/right anterolateral hemiblock, right QRS deviation/left posterolateral lower hemiblock, right ventricular hypertrophy, complete left or right bundle branch block, long or short QT interval, early ventricular repolarization Brugada like, ventricular arrhythmias.