ATI Medication Calculation Competency Exam ( 25 Questions)
A nurse is preparing to administer digoxin 8 mcg/kg/day PO to divide equally every 12 hr for a preschooler who weighs 33 lb. Available is digoxin elixir 0.05 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.)
Correct Answer: 1.2
To calculate the dose of digoxin for the preschooler, we'll follow these steps:
Step 1: Convert the child's weight from pounds to kilograms:
33 pounds x (1 kg / 2.20462 pounds) ≈ 15 kg
Step 2: Calculate the total daily dose of digoxin:
Total Daily Dose (mcg) = Digoxin Dose (mcg/kg/day) x Weight (kg)
Total Daily Dose = 8 mcg/kg/day x 15 kg
Total Daily Dose = 120 mcg/day
Step 3: Calculate the dose per administration (BID):
Dose per Administration = Total Daily Dose / Number of Administrations per Day
Dose per Administration = 120 mcg/day / 2 doses/day
Dose per Administration = 60 mcg/dose
Step 4: Convert micro-grams to milligrams:
60 mcg x (1 mg / 1000 mcg) = 0.06 mg
Step 5: Calculate the volume to be administered:
Volume (mL) = Desired Dose (mg) / Concentration (mg/mL)
Volume = 0.06 mg / 0.05 mg/mL
Volume = 1.2 mL
Therefore, the nurse should administer 1.2 mL of digoxin elixir per dose.
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