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Polymorphic Ventricular Tachycardia (Torsades de Pointes)
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.
Remove offending drugs that prolong the QT interval and correct potassium or calcium imbalances as well.