A nurse is preparing to administer dopamine 2 mg/kg/min by continuous IV infusion to a client who weighs 176 lb. Available is dopamine 400 mg in dextrose 5% in water 250 mL. The nurse should set the IV pump to deliver how many mu/hr (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["6"]
Order: Dopamine 2 mcg/kg/min
Client Weight: 176 lbs
Available Solution: Dopamine 400 mg in 250 mL of D5W
Desired Rate: mL/hr
Convert Client Weight to Kilograms (kg)
1 kg = 2.2 lbs
Client Weight in kg: 176 lbs / 2.2 lbs/kg = 80 kg
Step 2: Calculate the Dopamine Dose per Minute
Dose: 2 mcg/kg/min
Client Weight: 80 kg
Total Dose per Minute: 2 mcg/kg/min x 80 kg = 160 mcg/min
Step 3: Convert Dopamine Dose to Milligrams (mg)
1 mg = 1000 mcg
Dose in mg/min: 160 mcg/min / 1000 mcg/mg = 0.16 mg/min
Step 4:Calculate the Dopamine Dose per Hour
Dose in mg/min: 0.16 mg/min
Minutes in an Hour: 60 min
Dose in mg/hr: 0.16 mg/min x 60 min/hr = 9.6 mg/hr
Step 5: Determine the Concentration of the Dopamine Solution
Available Dopamine: 400 mg
Solution Volume: 250 mL
Concentration: 400 mg / 250 mL = 1.6 mg/mL
Step 6: Calculate the Infusion Rate in mL/hr
Dose in mg/hr: 9.6 mg/hr
Concentration: 1.6 mg/mL
Infusion Rate: 9.6 mg/hr / 1.6 mg/mL = 6 mL/hr
Step 7: Round to the Nearest Whole Number
The calculated rate is 6 mL/hr, which is already a whole number.
Answer: 6 mL/hr
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["0.3"]
Explanation
Calculate the Total Daily Dose:
Dose: 40 mg/kg/day
Weight: 5 kg
Total Daily Dose: 40 mg/kg/day x 5 kg = 200 mg/day
Calculate the Dose Per Administration:
The dose is divided equally every 12 hours, meaning twice a day.
Dose Per Administration: 200 mg/day / 2 doses/day = 100 mg/dose
Calculate the Volume to Administer:
Available Concentration: 330 mg/mL
Volume (mL) = Desired Dose (mg) / Available Concentration (mg/mL)
Volume (mL) = 100 mg / 330 mg/mL
Volume (mL) ≈ 0.303 mL
Round to the Nearest Tenth:
0.3 mL
Correct Answer is ["0.2"]
Explanation
Convert the Client's Weight from Pounds to Kilograms:
1 kg = 2.205 lbs
Weight in kg = 138 lbs / 2.205 lbs/kg
Weight in kg ≈ 62.585 kg
Calculate the Total Dose of Darbepoetin Needed:
Dose = 0.75 mcg/kg x 62.585 kg
Dose ≈ 46.93875 mcg
Calculate the Volume of Darbepoetin to Administer:
Available concentration = 60 mcg/0.3 mL
To simplify, find the concentration per 1 mL: 60 mcg / 0.3 mL = 200 mcg/mL
Volume (mL) = Desired dose (mcg) / Available concentration (mcg/mL)
Volume (mL) = 46.93875 mcg / 200 mcg/mL
Volume (mL) ≈ 0.23469 mL
Round to the Nearest Tenth:
0.2 mL
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