A nurse is preparing to administer dopamine 3mcg/kg/min by continuous IV infusion to a preschooler who weighs 41.8 bs. Available is dopamine 400 mg in dextrose 596 in water (D5W) 250 mL. The nurse should set the IV pump to deliver how many ml/hr? (Round to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
2.1 mL/hr
12.5 mL/hr
35.6 mL/hr
20.2 mL/hr
The Correct Answer is A
Given:
Ordered dose of Dopamine: 3 mcg/kg/min
Child's weight: 41.8 lbs
Concentration of Dopamine: 400 mg in 250 mL D5W
Step 1: Convert child's weight from pounds to kilograms:
1 pound (lb) = 0.453592 kilograms (kg)
Child's weight in kg = 41.8 lbs x 0.453592 kg/lb = 18.935 kg
Step 2: Calculate the total dose of Dopamine in mcg/min:
Total dose (mcg/min) = Ordered dose (mcg/kg/min) x Child's weight (kg)
Total dose (mcg/min) = 3 mcg/kg/min x 18.935 kg
Total dose (mcg/min) = 56.805 mcg/min
Step 3: Convert mcg to mg:
Total dose (mg/min) = Total dose (mcg/min) / 1000 mcg/mg
Total dose (mg/min) = 56.805 mcg/min / 1000 mcg/mg
Total dose (mg/min) = 0.056805 mg/min
Step 4: Calculate the total dose in mg/hr:
Total dose (mg/hr) = Total dose (mg/min) x 60 min/hr
Total dose (mg/hr) = 0.056805 mg/min x 60 min/hr
Total dose (mg/hr) = 3.4083 mg/hr
Step 5: Calculate the infusion rate in mL/hr:
Infusion rate (mL/hr) = Total dose (mg/hr) / Concentration (mg/mL)
Infusion rate (mL/hr) = 3.4083 mg/hr / (400 mg/250 mL)
Infusion rate (mL/hr) = 3.4083 mg/hr x (250 mL/400 mg)
Infusion rate (mL/hr) = 2.1301875 mL/hr
Step 6: Round to the nearest tenth:
Infusion rate (mL/hr) ≈ 2.1 mL/hr
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Related Questions
Correct Answer is C
Explanation
Convert ounces to milliliters (1 oz = 29.5735 mL):
8 oz coffee: 8 × 29.5735 = 236.588 mL
3 oz juice: 3 × 29.5735 = 88.7205 mL
12 oz soda: 12 × 29.5735 = 354.882 mL
Calculate the water intake from the water pitcher:
Total water intake: 800 mL (initial) - 200 mL (remaining) = 600 mL
Calculate the IV fluid intake:
IV fluids at 40 mL/hr for 8 hours: 40 × 8 = 320 mL
Add all the fluid amounts:
Totalfluidintake=236.588mL+88.7205mL+354.882mL+600mL+320mL=1600.1905mL
Rounding to the nearest whole number: 1600 mL.
Correct Answer is B
Explanation
Given:
Ordered dose of hydrocortisone: 100 mg
Concentration of hydrocortisone: 250 mg/2 mL
Step 1: Set up the proportion:
Desired dose (mg) / Volume to administer (mL) = Concentration (mg/mL)
Step 2: Substitute the values:
100 mg / Volume = 250 mg/2 mL
Step 3: Solve for the unknown volume:
Volume = 100 mg / (250 mg/2 mL)
Volume = 100 mg x (2 mL / 250 mg)
Volume = 0.8 mL
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