A client with myasthenia gravis is receiving pyridostigmine 150 mg PO every 4 hours. The medication is available as 60 mg in 5 mL syrup. How many mL should the nurse administer? (If rounding is required, round to the nearest tenth.)
The Correct Answer is ["12.5"]
Desired dose = 150 mg
Available concentration = 60 mg / 5 mL
Calculate the volume to administer:
Volume to administer (mL) = Desired dose (mg) / Concentration (mg/mL)
= 150 mg / (60 mg / 5 mL)
= 150 mg / 12 mg/mL
= 12.5 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["28"]
Explanation
Total volume to be infused = 1 litre
Convert the total volume from liters to milliliters:
Total volume (mL) = Total volume (liters) x 1000 mL/litre
= 1 litre x 1000 mL/litre
= 1000 mL
Drop factor of the IV administration set = 20 gtt/mL
Calculate the total number of drops to be infused:
Total drops = Total volume (mL) x Drop factor (gtt/mL)
= 1000 mL x 20 gtt/mL
= 20000 gtt
Calculate the infusion time in minutes and then the infusion rate in drops per minute:
Infusion time (minutes) = Infusion time (hours) x 60 minutes/hour
= 12 hours x 60 minutes/hour
= 720 minutes
Infusion rate (gtt/minute) = Total drops / Infusion time (minutes)
= 20000 gtt / 720 minutes
≈ 27.77 gtt/minute
Round to the nearest whole number:
Rounded infusion rate = 28 gtt/minute
Correct Answer is ["180"]
Explanation
Convert the client's weight from pounds to kilograms:
Weight (kg) = Weight (pounds) / 2.2 pounds/kg
= 165 pounds / 2.2 pounds/kg
= 75 kg
Calculate the prescribed dose in mcg/minute:
Dose (mcg/minute) = Prescribed dose (mcg/kg/min) x Client's weight (kg)
= 2 mcg/kg/min x 75 kg
= 150 mcg/minute
Calculate the total amount of dobutamine prescribed per hour:
Dose per hour (mcg/hour) = Dose (mcg/minute) x 60 minutes/hour
= 150 mcg/minute x 60 minutes/hour
= 9000 mcg/hour
Convert the total amount of dobutamine in the IV solution to micrograms:
Total dobutamine (mcg) = Total dobutamine (mg) x 1000 mcg/mg
= 50 mg x 1000 mcg/mg
= 50000 mcg
Determine the concentration of the dobutamine solution in mcg/mL:
Concentration (mcg/mL) = Total dobutamine (mcg) / Total volume (mL)
= 50000 mcg / 1000 mL
= 50 mcg/mL
Calculate the infusion rate in mL/hour:
Infusion rate (mL/hour) = Desired dose per hour (mcg/hour) / Concentration (mcg/mL)
= 9000 mcg/hour / 50 mcg/mL
= 180 mL/hour
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