A nurse is preparing to administer a loading dose of esmolol 500 mcg/kg IV bolus given over 1 min to a client who weighs 176 lb. Available is esmolol injection 10 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["4"]
Calculation:
Convert the client's weight from pounds (lbs) to kilograms (kg):
Formula: Weight in kg = Weight in lbs / 2.2 lbs/kg
= 176 lbs / 2.2 lbs/kg
= 80 kg
Calculate the total loading dose of esmolol needed in micrograms:
Ordered dose: 500 mcg/kg
Client's weight in kg: 80 kg
Formula: Total dose (mcg) = Ordered dose (mcg/kg) × Client's weight (kg)
= 500 mcg/kg × 80 kg
= 40000 mcg
Convert the total dose from micrograms to milligrams:
Conversion factor: 1 mg = 1000 mcg
Formula: Total dose (mg) = Total dose (mcg) / 1000 mcg/mg
= 40000 mcg / 1000 mcg/mg
= 40 mg
Determine the concentration of the available esmolol injection:
Available concentration: 10 mg/mL
Calculate the volume of esmolol to administer:
Formula: Volume to administer (mL) = Desired dose (mg) / Concentration (mg/mL)
= 40 mg / 10 mg/mL
= 4 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["4"]
Explanation
Calculation:
Determine the desired dose:
Ordered dose: 10 mg
Determine the available concentration of the medication:
Available concentration: 5 mg / 2 mL
Calculate the volume needed to administer the desired dose:
Formula: Volume (mL) = Desired dose (mg) × (Volume of solution (mL) / Available dose (mg))
= 10 mg × (2 mL / 5 mg)
= 20 mL / 5
= 4 mL
Correct Answer is ["0.3"]
Explanation
Calculation:
Convert the child's weight from pounds (lbs) to kilograms (kg):
Formula: Weight in kg = Weight in lbs / 2.2 lbs/kg
= 66 lbs / 2.2 lbs/kg
= 30 kg
Calculate the total dose of epinephrine needed in milligrams:
Ordered dose: 0.01 mg/kg
Child's weight in kg: 30 kg
Formula: Total dose (mg) = Ordered dose (mg/kg) × Child's weight (kg)
= 0.01 mg/kg × 30 kg
= 0.3 mg
Determine the concentration of the available epinephrine injection:
Available concentration: 1 mg/mL
Calculate the volume of epinephrine to administer:
Formula: Volume to administer (mL) = Desired dose (mg) / Concentration (mg/mL)
= 0.3 mg / 1 mg/mL
= 0.3 mL
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