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 ["83"]
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
Total infusion time in hours = 12 hours
Calculate the infusion rate in mL per hour:
Infusion rate (mL/hour) = Total volume (mL) / Total infusion time (hours)
= 1000 mL / 12 hours
≈ 83.33 mL/hour
Round to the nearest whole number:
Rounded infusion rate = 83 mL/hour
Correct Answer is ["10.2"]
Explanation
Calculate the prescribed dose in mcg/minute:
Dose (mcg/minute) = Prescribed dose (mcg/kg/min) x Client's weight (kg)
= 3 mcg/kg/min x 91 kg
= 273 mcg/minute
Calculate the total amount of dopamine prescribed per hour:
Dose per hour (mcg/hour) = Dose (mcg/minute) x 60 minutes/hour
= 273 mcg/minute x 60 minutes/hour
= 16380 mcg/hour
Convert the total amount of dopamine in the IV solution to micrograms:
Total dopamine (mcg) = Total dopamine (mg) x 1000 mcg/mg
= 400 mg x 1000 mcg/mg
= 400000 mcg
Determine the concentration of the dopamine solution in mcg/mL:
Concentration (mcg/mL) = Total dopamine (mcg) / Total volume (mL)
= 400000 mcg / 250 mL
= 1600 mcg/mL
Calculate the infusion rate in mL/hour:
Infusion rate (mL/hour) = Desired dose per hour (mcg/hour) / Concentration (mcg/mL)
= 16380 mcg/hour / 1600 mcg/mL
≈ 10.2375 mL/hour
Round to the nearest tenth:
Rounded infusion rate = 10.2 mL/hour
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