Polymorphic ventricular tachycardia (a.k.a. Torsades de Pointes) is best treated with intravenous magnesium. Patients with a prolonged QT interval have a higher risk of developing polymorphic VT.

Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT) is a rare genetic ventricular tachycardia which can result in sudden cardiac death and/or syncope in young individuals with ...