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 ["25"]
Explanation
Calculation:
Determine the total volume to be infused per hour:
Ordered rate: 100 mL/hr
Determine the drop factor of the IV tubing:
Drop factor: 15 gtt/mL
Calculate the total number of drops to be infused per hour:
Formula: Total drops per hour (gtt/hr) = Total volume (mL/hr) × Drop factor (gtt/mL)
= 100 mL/hr × 15 gtt/mL
= 1500 gtt/hr
Convert the flow rate to drops per minute:
Conversion factor: 1 hour = 60 minutes
Formula: Flow rate (gtt/min) = Total drops per hour (gtt/hr) / 60 min/hr
= 1500 gtt/hr / 60 min/hr
= 25 gtt/min
Correct Answer is ["60"]
Explanation
Calculation:
Calculate the total amount of lidocaine in milligrams:
Available lidocaine: 1 g
Conversion: 1 g × 1000 mg/g = 1000 mg
Determine the concentration of the lidocaine solution in milligrams per milliliter:
Total lidocaine: 1000 mg
Total volume of solution: 250 mL
Formula: Concentration (mg/mL) = Total milligrams / Total mL
= 1000 mg / 250 mL
= 4 mg/mL
Calculate the desired dose of lidocaine per hour in milligrams:
Ordered dose: 4 mg/min
Conversion: 4 mg/min × 60 min/hr = 240 mg/hr
Calculate the IV pump flow rate in mL/hr:
Formula: Flow rate (mL/hr) = Desired dose per hour (mg/hr) / Concentration (mg/mL)
= 240 mg/hr / 4 mg/mL
= 60 mL/hr
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