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 ["1.4"]
Explanation
Identify the given information:
Dose of ceftriaxone: 50 mg/kg
Weight of the toddler: 22 lb
Concentration of ceftriaxone: 350 mg/mL
Convert the toddler's weight from pounds to kilograms:
1 lb ≈ 0.453592 kg
Calculate the total dose of ceftriaxone in mg:
Total dose = Dose/kg x Weight (kg)
Substitute the values:
Total dose = 50 mg/kg x 22 lb x (0.453592 kg/1 lb)
Total dose ≈ 498.95 mg
Calculate the volume of ceftriaxone to be administered:
Volume = Total dose (mg) / Concentration (mg/mL)
Substitute the values:
Volume = 498.95 mg / 350 mg/mL
Volume ≈ 1.42 mL
Round the answer to the nearest tenth:
Volume ≈ 1.4 mL
Correct Answer is ["3.9"]
Explanation
Step-by-Step Solution:
Convert the toddler's weight from pounds to kilograms.
1 pound= 0.453592 kilograms.
26 pounds = 26 x 0.453592 = 11.793592 kilograms.
Calculate the total daily dose of prednisolone.
The prescribed dose is 2 mg/kg/day.
The toddler weighs 11.793592 kg.
Total daily dose = 2 mg/kg/day x 11.793592 kg = 23.587184 mg/day.
Determine the dose per administration.
Total daily dose is divided into two equal doses (every 12 hours).
The dose per administration = 23.587184 mg/day / 2 = 11.793592 mg per dose.
Calculate the volume of prednisolone syrup to administer.
The available prednisolone syrup is 15 mg/5 ml.
To find the volume, we can set up a proportion:
15 mg / 5 ml = 11.793592 mg / x ml
Cross-multiplying:
15x = 5 x 11.793592
Solving for x:
x = (5 x 11.793592) / 15 = 3.931197 ml
Round the answer to the nearest tenth.
3.9 mL
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