|Long QT syndrome||
A condition in which there are alterations to the normal patterns of contraction of the heart. On the electrocardiogram, there are abnormalities seen that are known as a prolonged QT interval and polymorphic ventricular arrhythmias (torsade de pointes). These cardiac arrhythmias may result in recurrent syncopes (faints), seizure, or sudden death. Individuals may have no symptoms and have no structural heart disease. LQTS can be caused by changes in one of several genes which can be passed on to family members in either an autosomal dominant or autosomal recessive pattern.