A nurse is preparing to administer nitroprusside 4 mcg/kg/min IV to a client who weighs 143 lb. Available is nitroprusside 50 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 whole number. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["78"]
Calculation:
Convert the client's weight from pounds (lbs) to kilograms (kg):
Formula: Weight in kg = Weight in lbs / 2.2 lbs/kg
= 143 lbs / 2.2 lbs/kg
≈ 65 kg
Calculate the desired dose of nitroprusside per minute in micrograms:
Ordered dose: 4 mcg/kg/min
Client's weight in kg: 65 kg
Formula: Dosage (mcg/min) = Ordered dose (mcg/kg/min) × Client's weight (kg)
= 4 mcg/kg/min × 65 kg
= 260 mcg/min
Calculate the desired dose of nitroprusside per hour in micrograms:
Conversion factor: 1 hour = 60 minutes
Formula: Dosage (mcg/hr) = Dosage (mcg/min) × 60 min/hr
= 260 mcg/min × 60 min/hr
= 15600 mcg/hr
Determine the concentration of the nitroprusside solution in micrograms per milliliter:
Available nitroprusside: 50 mg
Convert milligrams to micrograms: 50 mg × 1000 mcg/mg = 50000 mcg
Total volume of solution: 250 mL
Formula: Concentration (mcg/mL) = Total micrograms / Total mL
= 50000 mcg / 250 mL
= 200 mcg/mL
Calculate the IV pump flow rate in mL/hr:
Formula: Flow rate (mL/hr) = Desired dose per hour (mcg/hr) / Concentration (mcg/mL)
= 15600 mcg/hr / 200 mcg/mL
= 78 mL/hr
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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 ["167"]
Explanation
Calculation:
Determine the total volume to be infused:
Total volume: 250 mL
Determine the total infusion time in hours:
Infusion time: 90 minutes
Conversion: 90 minutes / 60 minutes/hour = 1.5 hours
Calculate the IV pump flow rate in mL/hr:
Formula: Flow rate (mL/hr) = Total volume (mL) / Total time (hours)
= 250 mL / 1.5 hours
≈ 166.67 mL/hr
Round the answer to the nearest whole number:
166.67 mL/hr rounded to the nearest whole number is 167 mL/hr.
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