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 ["78"]
Explanation
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
Correct Answer is B
Explanation
A. Morphine 4 mg IV q4h prn pain rating of 7 to 10: This prescription is clear and appropriate for pain management. It specifies the correct dosage of morphine (4 mg) to be administered every 4 hours as needed, and it is based on a pain rating scale of 7 to 10, which is standard practice for administering opioids for severe pain. No further clarification is needed here.
B. Zolpidem 5 mg PO qhs prn insomnia: Zolpidem is typically prescribed for short-term use in treating insomnia, usually for no more than 7-10 days. Prescribing it "prn" (as needed) for insomnia is problematic because insomnia often requires regular use for effective treatment, rather than on an as-needed basis. This requires clarification as the prescription doesn’t align with typical use guidelines for zolpidem.
C. Carbidopa 25 mg/levodopa 100 mg PO 3 times daily: This prescription is appropriate for managing symptoms of Parkinson’s disease. Carbidopa/levodopa is commonly prescribed in combination to help control motor symptoms. The dosage and frequency (3 times daily) are consistent with typical treatment regimens for Parkinson’s disease.
D. Carbamazepine 200 mg PO 2 times daily: This prescription is correct for carbamazepine, which is often used to treat seizure disorders and certain types of neuralgia. The prescribed dose and frequency (200 mg twice daily) are within standard dosage recommendations for this medication. No clarification is needed here.
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