KCNQ1 and familial atrial fibrillation: Although previous studies have found KCNQ1 gene polymorphisms to be associated with arrhythmogenic syndromes (such as long QT syndrome, short QT syndrome and familial atrial fibrillation), their effects on arrhythmia development in individuals prone to VTA due to ischemic cardiomyopathy have not been investigated before [18, 19, 20].