Ordered: Theophylline 3 mg/kg of body weight to be given q 6hr orally
Recommended: 3 mg per kg per dose given four times per day
Child's weight 42lbs
Available: Theophylline 150 mg/15ml
How many milliliters per dose? (to nearest tenth)
5.7ml PO
0.4 ml PO
22.8 ml PO
1.9 ml PO
The Correct Answer is A
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Plan to restart the IV in another location after the medication: Delaying intervention could worsen the patient’s condition. Administering medication into a compromised site risks further irritation, infiltration, or infection.
B. Restart the IV in another location before infusing the medication: This is the best action because redness, swelling, and tenderness suggest phlebitis or infiltration. Restarting the IV ensures safe administration and prevents complications.
C. Change the IV dressing, it may be too tight: A tight dressing may cause discomfort, but redness and swelling indicate an actual site complication, not just pressure from the dressing. Changing it alone would not resolve the issue.
D. Infuse the medication slowly to decrease vein irritation: Slowing the infusion does not correct the underlying problem of an inflamed or infiltrated IV site and could worsen local tissue damage if medication leaks outside the vein.
Correct Answer is A
Explanation
Convert the child's weight from pounds (lb) to kilograms (kg).
Client weight: 66 pounds
1 kg = 2.2 lbs
Weight (kg) = 66 lbs / 2.2 lbs/kg
= 30 kg.
Determine the minimum recommended daily dose (mg/day).
The label information states the usual dosage is 25 to 50 mg/kg/day in equally divided doses at 6-hour intervals (4 doses per day).
Minimum recommended rate: 25 mg/kg/day
Minimum daily dose (mg) = 25 mg/kg/day x 30 kg
= 750 mg/day.
Determine the maximum recommended daily dose (mg/day).
Maximum recommended rate: 50 mg/kg/day
Maximum daily dose (mg) = 50 mg/kg/day x 30 kg
= 1500 mg/day.
Calculate the minimum safe single dose (mg/dose).
Dosing frequency: q6h (4 doses per day)
Minimum single dose (mg) = Minimum daily dose (mg/day) / 4 doses/day
= 750 mg / 4
= 187.5 mg/dose.
Calculate the maximum safe single dose (mg/dose).
Maximum single dose (mg) = Maximum daily dose (mg/day) / 4 doses/day
= 1500 mg / 4
= 375 mg/dose.
Calculated range is 187.5 mg - 375 mg
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