The long QT synrome (LQTS) is a heart condition associated with prolongation of repolarization (recovery) following depolarization (excitation) of the cardiac ventricles. It is associated with syncope (fainting) and sudden death due to ventricular arrhythmias. Arrhythmias in individuals with LQTS are often associated with exercise or excitement. LQTS is associated with the rare, ventricular arrhythmia torsade de pointes, which can deteriorate into ventricular fibrillation and ultimately death.