KCNH2 and familial long QT syndrome: Patients with a prior epilepsy diagnosis constituted 5 of 19 for LQTS probands (3 KCNH2 and 1 KCNQ1), 2 of 15 for CPVT probands (1 RYR2), and 1 of 15 for BS probands (1 SCN5A) (Fig 2B).