- Past history of suffering from structural heart disease, arrhythmias, heart failure, history of history, history of myocardial infarction, angina pectoris, history cannot be explained, fast ventricular reverse history, history of ventricular tachycardia, QT prolongation syndrome or have a history of long QT syndrome symptoms and family history (as evidenced by genetic or close relative at a young age due to cardiac causes of sudden death show);