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.)
The Correct Answer is ["450"]
- To calculate the infusion rate, use the formula:
(mL of solution / grams of drug) x (grams ordered / minutes to infuse) x 60
- In this case, the formula becomes: (500 mL / 20 g) x (6 g / 20 min) x 60
- Simplify and solve: (25 mL / g) x (0.3 g / min) x 60
- The answer is 450 mL/hour
- The nurse should set the infusion pump at 450 mL/hour
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Insert a Foley catheter with a urimeter to monitor hourly output: This is a reasonable intervention because magnesium sulfate can affect renal function, and monitoring urinary output is essential. However, there's a more critical intervention to consider first.
B. Have calcium gluconate immediately available: This is the highest priority. Magnesium sulfate toxicity can lead to neuromuscular blockade, and calcium gluconate is the antidote. Having it readily available is crucial in case signs of magnesium toxicity (such as loss of deep tendon reflexes) appear.
C. Provide a quiet environment with subdued lighting: While maintaining a calm environment is generally important for clients on magnesium sulfate, it is not the highest priority in this situation.
D. Assess deep tendon reflexes (DTRs) every 4 hours: This is an important part of monitoring for magnesium sulfate toxicity. However, the immediate availability of calcium gluconate is the highest priority in case toxicity occurs.
Correct Answer is ["450"]
Explanation
- To calculate the infusion rate, use the formula:
(mL of solution / grams of drug) x (grams ordered / minutes to infuse) x 60
- In this case, the formula becomes: (500 mL / 20 g) x (6 g / 20 min) x 60
- Simplify and solve: (25 mL / g) x (0.3 g / min) x 60
- The answer is 450 mL/hour
- The nurse should set the infusion pump at 450 mL/hour
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