ATI RN
RN VATI Pharmacology S 2019 Questions
Extract:
Question 1 of 5
A nurse is preparing to administer dopamine 5 mcg/kg/min by continuous IV infusion to a client who weighs 220 lb. Available is 400 mg of dopamine in 250 ml of 0.9% sodium chloride. The nurse should set the IV pump to deliver how many mL/hr?
Correct Answer: A
Rationale:
To calculate the IV pump rate for dopamine infusion, we must first convert the client's weight to kg (1 lb = 0.45 kg).
Therefore, 220 lb = 100 kg. The next step is to calculate the total dose of dopamine needed per minute (5 mcg/kg/min x 100 kg = 500 mcg/min).
To determine the infusion rate in ml/hr, we need to convert mcg/min to mg/hr (500 mcg/min = 0.5 mg/min).
Then, we divide the total dose (400 mg) by the total volume (250 ml) to get the concentration (400 mg/250 ml = 1.6 mg/ml). Finally, we divide the total dose per minute (0.5 mg/min) by the concentration (1.6 mg/ml) to get the infusion rate in ml/hr (0.5 mg/min รท 1.6 mg/ml = 0.3125 ml/min or 18.
Question 2 of 5
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Question 3 of 5
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Question 5 of 5
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