19 A Medication Order Calls For A Dopamine Drip

Question

19. A medication order calls for a dopamine drip at 5 μg/kg/min for a 185- lb patient. The pharma…

19. A medication order calls for a dopamine drip at 5 μg/kg/min for a 185- lb patient. The pharmacy adds 400 mg dopamine in 250 mL of D5W. Calculate the drip rates per minute when using administration sets delivering (a) 15 drops/mL, (b) 20 drops/mL, and (c) 60 drops/mL.

Solutions

Expert Solution

First we convert lbs to kg.

weight of the patient = 185 lb = 185 * 0.4536 = 83.90
kg

medication order for the patient = 5 ug/kg/min

So, total medication requirement for patient for their weight
would be = 5 ug/kg/min * 83.90 kg = 419.50 ug/min = 0.42
mg/min

D5W per mg of Dopamine = 250/400 mL/mg = 0.625
ml/mg

Note that we have to make sure that multiplied quantities have
units of same order

a) At 15 drops/mL

Drip rate per minute = 0.42 mg/min * 0.625 mL/mg * 15 drops/mL =
3.9375 drops/min

b) At 20 drops/mL

Drip rate per minute = 0.42 mg/min * 0.625 mL/mg * 20 drops/mL =
5.25 drops/min

c) At 60 drops/mL

Drip rate per minute = 0.42 mg/min * 0.625 mL/mg * 60 drops/mL =
15.75 drops/min


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