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Doctor orders Dobutamine 4 mcg/kg/min IV infusion. The patient weighs 198 lb. You are supplied with a bag of Dobutamine that reads 250 mg/250 ml. How many mL/hr will you administer?

A. 7 mL/hr
B. 8.35 mL/hr
C. 21.6 mL/hr
D. 25 mL/hr

Answer :

The correct IV infusion rate for administering Dobutamine to a 198 lb patient as per the doctor's order of 4 mcg/kg/min is 21.6 mL/hr, which is choice C. Therefore the correct option is C. 21.6 mL/hr.

Calculating IV Infusion Rate

To calculate the IV infusion rate for a Dobutamine prescription, we will first convert the patient's weight from pounds to kilograms. Knowing that 1 kilogram is equal to 2.2 pounds, we can find the weight in kilograms as follows:

  • 198 lb \/ 2.2 = 90 kg (approximately)

Next, we use the doctor's prescription to find the necessary dose in micrograms per minute and convert this to milligrams per hour:

  1. 4 mcg/kg/min \\times 90 kg = 360 mcg/min
  2. 360 mcg/min \\times 60 min/hr = 21600 mcg/hr (or 21.6 mg/hr)

Using the concentration of Dobutamine we have:

250 mg in 250 mL which implies 1 mg/mL

Now, we calculate how many mL of solution would contain 21.6 mg:

  • 21.6 mg \/ (1 mg/mL) = 21.6 mL/hr

The correct infusion rate to administer the prescribed dose of Dobutamine is, therefore, 21.6 mL/hr, which corresponds to answer choice C.

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