What is the maximum dose of magnesium sulfate for pediatric torsades de pointes?

What is the maximum dose of magnesium sulfate for pediatric torsades de pointes?

• A. 1 g
• B. 3 g
• C. 4 g
• D. 2 g

Answer: (D)

Magnesium sulfate helps terminate torsades de pointes in children by stabilizing the cardiac cell membranes and reducing the early afterdepolarizations that drive the dangerous rhythm when the QT interval is prolonged. In pediatric practice, the dose is weight-based: 25-50 mg/kg given as an IV bolus over 10–20 minutes. The maximum amount given in one dose is 2 g. If the rhythm persists, a second dose can be given after a short interval, up to a total of 4 g within a 24-hour period. Therefore, the largest single administration you would give is 2 g, which is why this is chosen as the maximum dose.

Magnesium sulfate helps terminate torsades de pointes in children by stabilizing the cardiac cell membranes and reducing the early afterdepolarizations that drive the dangerous rhythm when the QT interval is prolonged.

In pediatric practice, the dose is weight-based: 25-50 mg/kg given as an IV bolus over 10–20 minutes. The maximum amount given in one dose is 2 g. If the rhythm persists, a second dose can be given after a short interval, up to a total of 4 g within a 24-hour period. Therefore, the largest single administration you would give is 2 g, which is why this is chosen as the maximum dose.