has material basis in germline mutation in KCNQ1 familial long QT syndrome long QT syndrome 1 https://github.com/monarch-initiative/mondo/issues/9285 long QT syndrome type 1 GARD:0026140 DOID:0110644 SCTID:20852007 LQT1 long QT syndrome 1/2, digenic NCIT:C85049 ventricular fibrillation with prolonged QT interval MedDRA:10039211 long QT syndrome 1 long QT syndrome 1, acquired, susceptibility to MONDO:0100316 MEDGEN:1641146 UMLS:C4551647 OMIM:192500