A Rare Case of the Digenic Inheritance of Long QT Syndrome Type 2 and Type 6.

We report a 37-year-old woman with an out-of-hospital cardiac arrest caused by ventricular fibrillation due to digenic inheritance of long QT syndrome type 2 ( gene) and type 6 ( gene). During hospitalization, prolonged QTc intervals and frequent episodes of ventricular tachyarrhythmias manifested. Genetic testing identified a mutation of the gene and an unclassified variant, most likely pathogenic, of the gene. This digenic inheritance is extremely rare.