A nurse is preparing to administer nafcillin 25 mg/kg/day IM divided in equal doses every 12 hr to a school-age child who weighs 83 lb. Available is nafcillin injection 250 mg/ml. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["1.9"]
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
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["0.4"]
Explanation
Identify the given information:
Dose of ferrous fumarate: 3 mg/kg/day
Weight of the toddler: 22 lb
Concentration of ferrous fumarate drops: 45 mg/0.6 mL
Convert the toddler's weight from pounds to kilograms:
1 lb ≈ 0.453592 kg
Calculate the total daily dose of ferrous fumarate in mg:
Total daily dose = Dose/kg/day x Weight (kg)
Substitute the values:
Total daily dose = 3 mg/kg/day x 22 lb x (0.453592 kg/1 lb)
Total daily dose ≈ 29.97 mg
Calculate the dose per dose (every 8 hours):
Dose per dose = Total daily dose / 3
Substitute the values:
Dose per dose = 29.97 mg / 3
Dose per dose ≈ 9.99 mg
Calculate the volume of ferrous fumarate drops to be administered:
Volume = Dose per dose (mg) / Concentration (mg/mL)
Substitute the values:
Volume = 9.99 mg / (45 mg/0.6 mL)
Volume ≈ 0.133 mL
Round the answer to the nearest tenth:
Volume ≈ 0.1 mL
Correct Answer is ["1"]
Explanation
Step-by-Step Solution:
Convert the child's weight from pounds to kilograms.
1 pound is approximately 0.453592 kilograms.
88 pounds = 88 x 0.453592 = 39.916736 kilograms.
Calculate the total dose of morphine.
The prescribed dose is 0.1 mg/kg.
The child weighs 39.916736 kg.
Total dose = 0.1 mg/kg x 39.916736 kg = 3.9916736 mg.
Calculate the volume of morphine injection to administer.
The available morphine injection is 4 mg/mL.
To find the volume, we can set up a proportion:
4 mg / 1 mL = 3.9916736 mg / x mL
Cross-multiplying:
4x = 3.9916736
Solving for x:
x = 3.9916736 / 4 = 0.9979184 mL
Round the answer to the nearest whole number: 1 mL
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