Final answer:
The nurse should administer Magnesium Sulfate IV to a client with torsades de pointes and a heart rate of 180 bpm. Option c.
Step-by-step explanation:
The nurse should prepare to administer Magnesium Sulfate intravenously in a client with torsades de pointes and a heart rate of 180 bpm. Magnesium sulfate is the drug of choice for treating torsades de pointes, a type of ventricular tachycardia characterized by a rapid and irregular heartbeat. It works by stabilizing the cell membrane and preventing abnormal electrical activity in the heart. Option c.