What is the dose and route for magnesium sulfate when treating torsades de pointes in cardiac arrest?

What is the dose and route for magnesium sulfate when treating torsades de pointes in cardiac arrest?

• A. 2 g IV/IO in 10 mL NS over 2 minutes
• B. 1 g IV push over 1 minute
• C. 4 g IV over 20 minutes
• D. 2 g IM

Answer: (A)

Magnesium sulfate is given in torsades de pointes during cardiac arrest to stabilize the cardiac cells and suppress abnormal electrical activity that prolongs the QT interval. Delivering it quickly via IV or IO ensures the heart tissue receives magnesium right away, which can help terminate the arrhythmia. The standard approach is to give 2 grams of magnesium sulfate dissolved in 10 mL of normal saline and administer it over about 2 minutes through IV or IO access. This rapid bolus provides an effective concentration promptly without delaying other resuscitation efforts. A smaller IV push (1 gram) is not enough to reliably treat torsades in this setting. A much slower infusion (4 grams over 20 minutes) doesn’t meet the need for rapid action during an arrest. Intramuscular administration is not appropriate here due to inconsistent absorption and the urgent need for swift effect.

Magnesium sulfate is given in torsades de pointes during cardiac arrest to stabilize the cardiac cells and suppress abnormal electrical activity that prolongs the QT interval. Delivering it quickly via IV or IO ensures the heart tissue receives magnesium right away, which can help terminate the arrhythmia.

The standard approach is to give 2 grams of magnesium sulfate dissolved in 10 mL of normal saline and administer it over about 2 minutes through IV or IO access. This rapid bolus provides an effective concentration promptly without delaying other resuscitation efforts.

A smaller IV push (1 gram) is not enough to reliably treat torsades in this setting. A much slower infusion (4 grams over 20 minutes) doesn’t meet the need for rapid action during an arrest. Intramuscular administration is not appropriate here due to inconsistent absorption and the urgent need for swift effect.