<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>An autosomal dominant form of long QT syndrome caused by mutations in the KCNE1, KCNE2, KCNH2, KCNQ1, SCN5A, and ANK2 genes. It is manifested with arrhythmias.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>