A nurse is preparing to administer hydroxyzine 1 mg/kg IM to a school-age child who weighs 67 lb. Available is hydroxyzine injection 25 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 ["1.2"]
First, convert the child's weight from pounds to kilograms: 67 lb / 2.205 lb/kg = 30.39 kg
Calculate the total dose of hydroxyzine needed: 1 mg/kg * 30.39 kg = 30.39 mg
Calculate the volume of hydroxyzine to administer: 30.39 mg / 25 mg/mL = 1.2156 mL
Round to the nearest tenth: 1.2156 mL rounded to the nearest tenth is 1.2 mL.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["3.5"]
Explanation
Identify the given information:
Dose of digoxin: 7.5 mcg/kg/day
Weight of the child: 52 lb
Concentration of digoxin elixir: 50 mcg/mL
Convert the child's weight from pounds to kilograms:
1 lb ≈ 0.453592 kg
Calculate the total daily dose of digoxin in mcg:
Total daily dose = Dose/kg/day x Weight (kg)
Substitute the values:
Total daily dose = 7.5 mcg/kg/day x 52 lb x (0.453592 kg/1 lb)
Total daily dose ≈ 177.56 mcg
Calculate the dose per dose (every 24 hours):
Dose per dose = Total daily dose / 1
Substitute the values:
Dose per dose = 177.56 mcg / 1
Dose per dose ≈ 177.56 mcg
Calculate the volume of digoxin elixir to be administered:
Volume = Dose per dose (mcg) / Concentration (mcg/mL)
Substitute the values:
Volume = 177.56 mcg / 50 mcg/mL
Volume ≈ 3.55 mL
Round the answer to the nearest tenth:
Volume ≈ 3.5 mL
Correct Answer is ["1.9"]
Explanation
Identify the given information:
Dose of nafcillin: 25 mg/kg/day
Weight of the child: 83 lb
Concentration of nafcillin injection: 250 mg/mL
Convert the child's weight from pounds to kilograms:
1 lb ≈ 0.453592 kg
Calculate the total daily dose of nafcillin in mg:
Total daily dose = Dose/kg/day x Weight (kg)
Substitute the values:
Total daily dose = 25 mg/kg/day x 83 lb x (0.453592 kg/1 lb)
Total daily dose ≈ 936.82 mg
Calculate the dose per dose (every 12 hours):
Dose per dose = Total daily dose / 2
Substitute the values:
Dose per dose = 936.82 mg / 2
Dose per dose ≈ 468.41 mg
Calculate the volume of nafcillin injection to be administered:
Volume = Dose per dose (mg) / Concentration (mg/mL)
Substitute the values:
Volume = 468.41 mg / 250 mg/mL
Volume ≈ 1.87 mL
Round the answer to the nearest tenth:
Volume ≈ 1.9 mL
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