Which antidysrhythmic medication is indicated for life-threatening ventricular tachycardia known as "Torsades de Pointes"?

Magnesium sulfate is the appropriate choice for managing Torsades de Pointes, a specific type of polymorphic ventricular tachycardia often associated with prolonged QT interval and electrolyte imbalances. The administration of magnesium acts to stabilize the cardiac membrane and restore normal rhythm by addressing the underlying deficiency of magnesium, which can precipitate this arrhythmia. This specific use of magnesium sulfate is particularly important in the acute setting, as it can rapidly improve the heart rhythm and reduce the risk of life-threatening complications.

In contrast, adenosine is primarily utilized for the treatment of paroxysmal supraventricular tachycardia (SVT) and would not be effective in treating Torsades de Pointes. Amiodarone is a general antidysrhythmic agent that could be beneficial for various ventricular arrhythmias, but magnesium is more directly indicated for Torsades due to its specific mechanism of action related to magnesium deficiency. Digoxin is primarily used to control ventricular rate in atrial fibrillation and does not address Torsades de Pointes effectively. Consequently, magnesium sulfate uniquely addresses the needs in cases of this arrhythmia.