History of additional risk factors for torsade de pointes Presence of risk factors for torsade de pointes, including family history of Long QT Syndrome or uncorrected hypokalemia. History of serious ventricular arrhythmia (VT or VF, ? 3 beats in a row) and/or risk factors (e.g., heart failure, hypokalemia, family history of Long QT Syndrome) History of serious ventricular arrhythmia (VT or VF, ? 3 beats in a row) and/or risk factors (e.g., heart failure, hypokalemia, family history of Long QT Syndrome) A history of additional risk factors for torsades de pointes (e.g., heart failure, hypokalemia, family history of long QT syndrome, etc.) A history of additional risk factors for torsade de pointes (e.g., heart failure, hypokalemia, family history of long QT syndrome) A history of additional risk factors for Torsade de Pointes (e.g., clinically significant heart failure, hypokalemia, family history of long QT syndrome) A history of additional risk factors for torsade de pointes (e.g., heart failure, hypokalemia, family history of Long QT Syndrome). A history of additional risk factors for torsade de pointes (e.g., clinically significant heart failure, hypokalemia, family history of long QT syndrome) History of additional risk factors for torsade de pointes (e.g., family history of long QT syndrome). Patients with risk factors for QTc prolongation or Torsade de Pointes. Presence of risk factors for torsade de pointes, including family history of Long QT Syndrome or uncorrected hypokalemia A history of additional risk factors for torsade de pointes (e.g., heart failure, hypokalemia, family history of long QT syndrome) Patients with unexplained syncope, history of or known risk factors for torsade des pointes, including congenital long QT syndrome, or family history of LQTS. History of additional risk factors for Torsade de Pointes