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 ["285"]
Explanation
Calculation:
Convert the client's weight from pounds (lbs) to kilograms (kg):
Formula: Weight in kg = Weight in lbs / 2.2 lbs/kg
= 167 lbs / 2.2 lbs/kg
≈ 75.91 kg
Calculate the total dose of amphotericin B lipid complex needed:
Ordered dose: 3.75 mg/kg
Client's weight in kg: ≈ 75.91 kg
Formula: Total dose (mg) = Ordered dose (mg/kg) × Client's weight (kg)
= 3.75 mg/kg × 75.91 kg
≈ 284.66 mg
Determine the concentration of the available amphotericin B lipid complex solution:
Available amount: 300 mg
Volume of solution: 300 mL
Formula: Concentration (mg/mL) = Total amount (mg) / Total volume (mL)
= 300 mg / 300 mL
= 1 mg/mL
Calculate the volume of solution to administer:
Formula: Volume to administer (mL) = Desired dose (mg) / Concentration (mg/mL)
= 284.66 mg / 1 mg/mL
= 284.66 mL
Round the answer to the nearest whole number:
284.66 mL rounded to the nearest whole number is 285 mL.
Correct Answer is ["83"]
Explanation
Calculation:
Determine the total volume to be infused:
Total volume: 250 mL
Determine the total infusion time in minutes:
Infusion time: 30 minutes
Determine the drop factor of the IV tubing:
Drop factor: 10 gtt/mL
Calculate the total number of drops needed:
Formula: Total drops (gtt) = Total volume (mL) × Drop factor (gtt/mL)
= 250 mL × 10 gtt/mL
= 2500 gtt
Calculate the flow rate in drops per minute (gtt/min):
Formula: Flow rate (gtt/min) = Total drops (gtt) / Total time (minutes)
= 2500 gtt / 30 minutes
≈ 83.33 gtt/min
Round the answer to the nearest whole number:
83.33 gtt/min rounded to the nearest whole number is 83 gtt/min.
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