In torsades de pointes during arrest, if the initial magnesium sulfate 1-2 g IV push is given and torsades persists, what is the recommended next step?

In torsades de pointes during arrest, if the initial magnesium sulfate 1-2 g IV push is given and torsades persists, what is the recommended next step?

• A. May repeat magnesium sulfate 1-2 g IV push
• B. Increase defibrillation energy
• C. Administer amiodarone
• D. Stop treatment and monitor

Answer: (A)

Magnesium sulfate is the cornerstone treatment for torsades de pointes because it helps stabilize the cardiac membrane and suppress the abnormal repolarization that drives this arrhythmia. If the initial 1–2 g IV push does not stop torsades, the next step is to give another 1–2 g IV push of magnesium sulfate. Repeating the bolus is recommended because torsades can persist despite the first dose, and magnesium often terminates the rhythm when given again. Defibrillation, while essential if the rhythm becomes or remains pulseless shockable, does not address the underlying driver of torsades as directly as magnesium does. Amiodarone is not preferred here since it can prolong the QT interval and potentially worsen torsades. Stopping treatment and monitoring would leave the dangerous arrhythmia untreated.

Magnesium sulfate is the cornerstone treatment for torsades de pointes because it helps stabilize the cardiac membrane and suppress the abnormal repolarization that drives this arrhythmia. If the initial 1–2 g IV push does not stop torsades, the next step is to give another 1–2 g IV push of magnesium sulfate. Repeating the bolus is recommended because torsades can persist despite the first dose, and magnesium often terminates the rhythm when given again. Defibrillation, while essential if the rhythm becomes or remains pulseless shockable, does not address the underlying driver of torsades as directly as magnesium does. Amiodarone is not preferred here since it can prolong the QT interval and potentially worsen torsades. Stopping treatment and monitoring would leave the dangerous arrhythmia untreated.