A nurse is preparing to administer phenytoin 2.5 mg/kg IV bolus to a school-age child who weighs 66 lb. Available is phenytoin injection 50 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["1.5"]
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 phenytoin needed in milligrams:
Ordered dose: 2.5 mg/kg
Child's weight in kg: 30 kg
Formula: Total dose (mg) = Ordered dose (mg/kg) × Child's weight (kg)
= 2.5 mg/kg × 30 kg
= 75 mg
Determine the concentration of the available phenytoin injection:
Available concentration: 50 mg/mL
Calculate the volume of phenytoin to administer:
Formula: Volume to administer (mL) = Desired dose (mg) / Concentration (mg/mL)
= 75 mg / 50 mg/mL
= 1.5 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["285"]
Explanation
Calculation:
Convert the client's weight from pounds (lbs) to kilograms (kg):
Formula: Weight in kg = Weight in lbs / 2.2 lbs/kg
= 167 lbs / 2.2 lbs/kg
≈ 75.91 kg
Calculate the total dose of amphotericin B lipid complex needed:
Ordered dose: 3.75 mg/kg
Client's weight in kg: ≈ 75.91 kg
Formula: Total dose (mg) = Ordered dose (mg/kg) × Client's weight (kg)
= 3.75 mg/kg × 75.91 kg
≈ 284.66 mg
Determine the concentration of the available amphotericin B lipid complex solution:
Available amount: 300 mg
Volume of solution: 300 mL
Formula: Concentration (mg/mL) = Total amount (mg) / Total volume (mL)
= 300 mg / 300 mL
= 1 mg/mL
Calculate the volume of solution to administer:
Formula: Volume to administer (mL) = Desired dose (mg) / Concentration (mg/mL)
= 284.66 mg / 1 mg/mL
= 284.66 mL
Round the answer to the nearest whole number:
284.66 mL rounded to the nearest whole number is 285 mL.
Correct Answer is ["4"]
Explanation
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
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