Mondo Description A condition that is characterized by episodes of fainting (syncope) and varying degree of ventricular arrhythmia as indicated by the prolonged QT interval. The inherited forms are caused by mutation of genes encoding cardiac ion channel proteins. The two major forms are Romano-Ward syndrome (also known as long QT syndrome 1) and Jervell-Lange Nielsen syndrome.

Disease Ontology Description An autosomal genetic disease that is characterized by delayed repolarization of the heart following a heartbeat increases the risk of episodes of torsade de pointes (TDP, a form of irregular heartbeat that originates from the ventricles).