A nurse is preparing to administer dopamine 5 mcg/kg/min to a client who weighs 198 lb. Available is dopamine 200 mg in dextrose 5% in water 250 mL. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["33.8"]
Calculation:
Convert the client's weight from pounds (lbs) to kilograms (kg):
Formula: Weight in kg = Weight in lbs / 2.2 lbs/kg
= 198 lbs / 2.2 lbs/kg
= 90 kg
Calculate the dopamine dosage in micrograms per minute:
Ordered dose: 5 mcg/kg/min
Client's weight in kg: 90 kg
Formula: Dosage (mcg/min) = Ordered dose (mcg/kg/min) × Client's weight (kg)
= 5 mcg/kg/min × 90 kg
= 450 mcg/min
Convert the dopamine dosage to micrograms per hour:
Conversion factor: 1 hour = 60 minutes
Formula: Dosage (mcg/hr) = Dosage (mcg/min) × 60 min/hr
= 450 mcg/min × 60 min/hr
= 27000 mcg/hr
Convert the dopamine concentration in the IV solution to micrograms per milliliter:
Available dopamine: 200 mg
Convert milligrams to micrograms: 200 mg × 1000 mcg/mg = 200000 mcg
Volume of solution: 250 mL
Formula: Concentration (mcg/mL) = Total micrograms / Total mL
= 200000 mcg / 250 mL
= 800 mcg/mL
Calculate the IV pump flow rate in mL/hr:
Formula: Flow rate (mL/hr) = Dosage needed (mcg/hr) / Concentration (mcg/mL)
= 27000 mcg/hr / 800 mcg/mL
= 33.75 mL/hr
Round the answer to the nearest tenth:
33.75 mL/hr rounded to the nearest tenth is 33.8 mL/hr.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["0.3"]
Explanation
Calculation:
Convert the child's weight from pounds (lbs) to kilograms (kg):
Formula: Weight in kg = Weight in lbs / 2.2 lbs/kg
= 66 lbs / 2.2 lbs/kg
= 30 kg
Calculate the total dose of epinephrine needed in milligrams:
Ordered dose: 0.01 mg/kg
Child's weight in kg: 30 kg
Formula: Total dose (mg) = Ordered dose (mg/kg) × Child's weight (kg)
= 0.01 mg/kg × 30 kg
= 0.3 mg
Determine the concentration of the available epinephrine injection:
Available concentration: 1 mg/mL
Calculate the volume of epinephrine to administer:
Formula: Volume to administer (mL) = Desired dose (mg) / Concentration (mg/mL)
= 0.3 mg / 1 mg/mL
= 0.3 mL
Correct Answer is ["38"]
Explanation
Calculation:
Calculate the total amount of lidocaine in milligrams:
Available lidocaine: 1 g
Conversion: 1 g × 1000 mg/g = 1000 mg
Determine the concentration of the lidocaine solution in milligrams per milliliter:
Total lidocaine: 1000 mg
Total volume of solution: 250 mL
Formula: Concentration (mg/mL) = Total milligrams / Total mL
= 1000 mg / 250 mL
= 4 mg/mL
Calculate the desired dose of lidocaine per hour in milligrams:
Ordered dose: 2.5 mg/min
Conversion: 2.5 mg/min × 60 min/hr
= 150 mg/hr
Calculate the IV pump flow rate in mL/hr:
Formula: Flow rate (mL/hr) = Desired dose per hour (mg/hr) / Concentration (mg/mL)
= 150 mg/hr / 4 mg/mL
= 37.5 mL/hr
Round the answer to the nearest whole number:
37.5 mL/hr rounded to the nearest whole number is 38 mL/hr.
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