A nurse is caring for a client who has pneumonia and tells the nurse, "I feel like an elephant is sitting on my chest." The client is weak and unable to walk.
After the nurse initiates chest pain protocol, which of the following is the priority diagnostic test?

Choice A rationale:

Give the client protamine if signs of magnesium sulfate toxicity occur. Protamine is not the antidote for magnesium sulfate toxicity. Calcium gluconate or calcium chloride is used to counteract the effects of magnesium sulfate toxicity by antagonizing the action of magnesium on the neuromuscular junction and the heart.

Choice B rationale:

Monitor the FHR via Doppler every 30 min. While fetal heart rate (FHR) monitoring is important during magnesium sulfate infusion due to the risk of fetal distress, using Doppler every 30 minutes may not provide continuous and accurate monitoring. Continuous electronic fetal monitoring is the standard of care in this situation.

Choice C rationale:

Restrict the client's total fluid intake to 250 mL/hr. Magnesium sulfate is excreted by the kidneys, so maintaining adequate urine output is crucial to prevent magnesium toxicity. Restricting fluid intake to 250 mL/hr would likely reduce urine output, leading to an increased risk of magnesium sulfate accumulation in the body, which could be harmful.

Choice D rationale:

Measure the client's urine output every hour. Monitoring urine output is essential during magnesium sulfate infusion as it helps assess renal function and magnesium excretion. Adequate urine output (at least 30 mL/hr) is necessary to prevent magnesium toxicity. Therefore, measuring the client's urine output every hour is a critical nursing intervention to ensure the safety of the client.

Step 1: Convert the dopamine hydrochloride dose from mcg to mg. We know that 1 mg = 1000 mcg. So, 4 mcg = 0.004 mg.

Step 2: Calculate the total amount of dopamine hydrochloride the client needs per minute. We know that the client weighs 80 kg and the dose is 0.004 mg/kg/min. So, 0.004 mg/kg/min × 80 kg = 0.32 mg/min.

Step 3: Convert the total amount of dopamine hydrochloride the client needs per minute to an hourly rate. We know that 1 hour = 60 minutes. So, 0.32 mg/min × 60 min/hr = 19.2 mg/hr.

Step 4: Calculate the volume of the solution that contains 19.2 mg of dopamine hydrochloride. We know that the solution contains 800 mg in 250 mL. So, (19.2 mg ÷ 800 mg) × 250 mL = 6 mL.

Therefore, the nurse should set the IV infusion to deliver 6 mL/hr (rounded to the nearest whole number).