A patient is receiving an IV of esmolol 2.5 grams in 250 mL D5W (dextrose 5% in water) infusing at 200 micrograms/kilogram/minute. The patient weighs 110 lb. What rate (in mL/hr) should the nurse program into the IV pump to deliver this dose?
45 mL/hr
60 mL/hr
75 mL/hr
90 mL/hr
The Correct Answer is B
To calculate the infusion rate in mL/hr, you first need to find the total dosage the patient needs per minute and then convert it to mL/hr.
Convert the patient's weight from pounds to kilograms: 110 lb ÷ 2.2 = 50 kg
Calculate the total dosage per minute:
Dosage = 200 micrograms/kg/minute * 50 kg = 10,000 micrograms/minute or 10 mg/minute
Calculate the total volume per minute:
Concentration of esmolol solution = 2.5 grams in 250 mL = 10 mg/mL Volume = Dosage ÷ Concentration = 10 mg/minute ÷ 10 mg/mL = 1 mL/minute
Convert the volume per minute to mL/hr: 1 mL/minute × 60 minutes/hour = 60 mL/hour
So, the nurse should program the IV pump to deliver 60 mL/hr.
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Related Questions
Correct Answer is A
Explanation
To calculate the rate per hour to administer the loading dose of magnesium sulfate, you need to first find out how much magnesium sulfate is in the 6-gram loading dose, and then determine the rate at which this amount is administered over 30 minutes.
Determine the amount of magnesium sulfate in the 6-gram loading dose:
The physician orders 6 grams of magnesium sulfate.
Determine the volume of lactated Ringer's solution needed to provide 6 grams of magnesium sulfate:
In 1 liter of lactated Ringer's solution, there are 40 grams of magnesium sulfate.
Volume needed = (6 grams / 40 grams per liter) * 1 liter = 0.15 liters or 150 mL
Calculate the rate per hour:
The loading dose needs to be administered over 30 minutes, which is 0.5 hours.
Rate = Volume (in mL) / Time (in hours) = 150 mL / 0.5 hours = 300 mL/hour
So, the rate per hour to administer the loading dose is 300 mL/hr.
Correct Answer is B
Explanation
To calculate the dosage of fosphenytoin for a 57 kg client at a rate of 0.5 mg/kg, you can use the following formula:
Dosage (mg) = Weight (kg) × Dosage per kg (mg/kg)
Dosage (mg) = 57 kg × 0.5 mg/kg
Dosage (mg) = 28.5 mg
The dosage that needs to be administered to the client is 28.5 mg.
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