Which emergency medication is indicated for torsades de pointes polymorphic ventricular tachycardia?
Answer and explanation
Correct answer: A. Intravenous magnesium sulfate
Answer: Intravenous magnesium sulfate.
Why not the others: Magnesium sulfate stabilizes cardiac membranes and terminates early afterdepolarizations in torsades de pointes; Calcium carbonate has no effect on polymorphic VT; Diltiazem slows AV conduction but does not treat prolonged QT dysrhythmias; Nitrates do not correct QT prolongation.
Why not the others: Magnesium sulfate stabilizes cardiac membranes and terminates early afterdepolarizations in torsades de pointes; Calcium carbonate has no effect on polymorphic VT; Diltiazem slows AV conduction but does not treat prolonged QT dysrhythmias; Nitrates do not correct QT prolongation.
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