- Subject has a prior history of myocardial infarction, acute coronary syndrome, cerebrovascular accident, transient ischemic attack, ventricular tachycardia, atrial fibrillation, personal or known family history of congenital long QT syndrome or known family history of sudden death with unknown cause, a pacemaker or implantable cardioverter defibrillator, cardiac or cerebral stent placement or angioplasty, or clinically significant valvular heart disease.