2. In order to increase cardiac output and heart rate, the physician orders a 15

Question

2. In order to increase cardiac output and heart rate, the physician orders a 15.0 mcg/Kg/min IV dosage rate of dopamine for a 125 Kg patient. To maintain sodium ion and hydration levels without over- challenging the patient's renal kidney) system, the patient will be infused via IV at a rate of i 50. mL/hr with 0.9% sterile saline in a 500. mL ? bag. a. How long (in minutes and hours) will the patient be infused with this mixture until the IV bag is completely empty? b. What mass (in milligrams) of dopamine must be mixed with the sterile saline to maintain the indicated infused dose of dopamine with this IV bag? Based on this answer, what is the concentration of the dopamine in the IV bag (in mg/mL) afte it is mixed? . 95

Explanation / Answer

a)

Time until the bag is empty = Total volume / rate of infusion

= 500 mL / 150 mL/hr

= 3.33 hr

= 3 hours and 20 min

b)

Weight of patient = 125 Kg

Dose ordered = 15 mcg/Kg/min * 125 Kg * 60 min/hr / 1000 mg/mcg

= 112.5 mg/hr

Mass of dopamine to be mixed = 112.5 mg/hr * 3.33 hr

= 375 mg

c)

Concentration of dopamine after it is mixed = Mass of dopamine / Total volume

= 375 mg / 500 mL

= 0.75 mg/mL

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