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Electrocardiographic data. (A) Proband II-1 before installing pacemaker ECG showed bradycardia and atrial fibrillation (ventricular rate 50 bpm). (B) III-4 ECG showed sinus bradycardia (57 bpm) and early repolarization syndrome (ST elevation in V1-6 was upward concave, J-point elevation ≥0.2 mV). ECG, 12-lead electrocardiogram.
