KCNQ1 and familial long QT syndrome: Several years after this report, Chugh and colleagues analyzed 5 LQTS-associated genes (KCNQ1, KCNH2, SCN5A, KCNE1, and KCNE2) in 12 sudden unexplained death cases in whom no diagnosis could be established after thorough post-mortem analysis of 270 adult SCD cases.