Long QT syndrome.  Electrical miscues of the heart.
D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D017147:Defibrillators, Implantable; D004452:Echocardiography; D020022:Genetic Predisposition to Disease; D006801:Humans; D008133:Long QT Syndrome / Q000150:complications / Q000175:diagnosis / Q000209:etiology / Q000628:therapy; D011300:Preoperative Care / Q000379:methods; D013575:Syncope / Q000209:etiology*
D000319:Adrenergic beta-Antagonists