- Has a personal history of myocardial disease, Long QT Syndrome or a personal or family history of Long QT Syndrome (e.g., Anderson-Tawil Syndrome [micrognathia, low set ears, clinodactyly]; Timothy's Syndrome [syndactyly and autism spectrum disorder];: Jervell/Lange-Nielsen Syndrome [bilateral hearing loss]; Romano-Ward Syndrome [fainting, seizures]), unexplained syncope or presyncope, or current or recurrent hypokalemia.