Herzing University HESI Maternity Related

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The healthcare provider prescribes magnesium sulfate 6 grams intravenously (IV) to be infused over 20 minutes for client with preterm labor. The IV bag contains magnesium sulfate 20 grams in dextrose 5% in water 500 mL. How many mL/hour should the nurse set the infusion pump? (Enter numerical value only.)

Correct Answer: 450

Rationale: To deliver 6 grams over 20 minutes from a solution of 20 grams in 500 mL, the concentration is 25 mL/g. Thus, 6 grams requires 150 mL over 20 min, which is (150 mL / 20 min) x 60 = 450 mL/hour.