For which condition is magnesium sulfate indicated during CPR?

Magnesium sulfate is indicated during CPR for the condition known as Torsades de pointes, which is a form of polymorphic ventricular tachycardia characterized by a prolonged QT interval. This arrhythmia can be triggered by conditions such as electrolyte imbalances (specifically magnesium deficiency) and can lead to sudden cardiac arrest if not treated promptly.

Administering magnesium sulfate helps to stabilize the myocardial cell membrane and can restore a normal heart rhythm in patients experiencing Torsades de pointes. This intervention is crucial as it directly addresses the underlying issue that precipitates this specific arrhythmia, leading to a higher chance of a positive outcome when performing CPR.

In the other conditions listed, magnesium sulfate does not have a standard role. For instance, ventricular fibrillation, asystole, and pulseless electrical activity require different advanced interventions and medications to restore effective circulation, making magnesium sulfate inappropriate for those scenarios.