Order: Digoxin (Lanoxin) elixir 0.06 mg q 12 h PO
Recommended: (under 2years of age) 0.01 to 0.02 mg/kg/day, in divided doses q12 h
Child's weight: 20 pound, 11 month-old child
Available Lanoxin elixir 0.05 mg per ml.
What is the minimum and maximum safe and effective single dose for this child? (to the nearest hundredth)
0.5 mg PO - 1.0 mg PO
1.5 mg PO - 3.2 mg PO
5.0 mg PO - 10 mg PO
0.05 mg PO-0.09 mg PO
The Correct Answer is D
Convert the child's weight from pounds (lb) to kilograms (kg).
Client weight: 20 lbs
Conversion factor: 1 kg = 2.2 lbs
Weight (kg) = 20 lbs / 2.2 lbs/kg
= 9.091 kg.
Calculate the minimum safe daily dose (mg/day).
Minimum recommended rate: 0.01 mg/kg/day
= 0.01 mg/kg/day x 9.091 kg
= 0.091 mg/day.
Calculate the maximum safe daily dose (mg/day).
Maximum recommended rate: 0.02 mg/kg/day
= 0.02 mg/kg/day x 9.091 kg
= 0.182 mg/day.
Calculate the minimum safe single dose (mg/dose) and round to the nearest hundredth.
Dosing frequency: q12h (2 doses per day)
Minimum single dose (mg) = Minimum daily dose (mg/day) / 2 doses
= 0.091 mg / 2
= 0.045 mg
= 0.05 mg.
Calculate the maximum safe single dose (mg/dose) and round to the nearest hundredth.
Maximum single dose (mg) = Maximum daily dose (mg/day) / 2 doses
= 0.182 mg / 2
= 0.091 mg
= 0.09 mg.
The minimum and maximum safe and effective single dose for this child is 0.05 mg PO-0.09 mg PO.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Convert the child's weight from pounds (lb) to kilograms (kg).
Client weight: 42 lbs
1 kg = 2.2 lbs
Weight (kg) = 42 lbs / 2.2 lbs/kg
= 19.091 kg.
Calculate the single ordered dose in milligrams (mg/dose).
Ordered rate: 3 mg/kg/dose
Single dose (mg) = 3 mg/kg/dose x 19.091 kg
= 57.273 mg.
Determine the concentration of the available solution.
Available: 150 mg in 15 mL
Concentration (mg/mL) = 150 mg / 15 mL
= 10 mg/mL.
Calculate the volume to administer per single dose in milliliters (mL).
Volume (mL) = Single Dose (mg) / Concentration (mg/mL)
= 57.273 mg / 10 mg/mL
= 5.727 mL.
Round the answer to the nearest tenth.
= 5.7 mL.
Correct Answer is A
Explanation
Convert the child's weight from pounds (lb) to kilograms (kg).
Client weight: 35 lbs
Conversion factor: 1 kg = 2.2 lbs
Weight (kg) = 35 lbs / 2.2 lbs/kg
= 15.909 kg.
Determine the minimum safe single dose in milligrams (mg/dose).
Minimum recommended rate: 3 mg/kg/day
Dosing frequency: q8h (3 doses per day)
Minimum single dose (mg) = (3 mg/kg/day x Weight kg) / 3 doses/day
= 15.909 kg x 3 mg/kg/day / 3 doses/day
= 15.909 mg/dose
= 15.9 mg.
Determine the maximum safe single dose in milligrams (mg/dose).
Maximum recommended rate: 6 mg/kg/day
Dosing frequency: q8h (3 doses per day)
Maximum single dose (mg) = (6 mg/kg/day x Weight kg) / 3 doses/day
= 15.90909... kg x 6 mg/kg/day / 3 doses/day
= 31.81818... mg/dose
= 31.8 mg.
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