Question

client who weighs 65 kg is receiving an infusion of Dextrose 5% in Water (D5W) 250 ml with dopamine 400 mg at 12 ml/hour. How many mcg/kg/minute is the client receiving

Answer 1

The mcg/kg/minute the client is receiving is 4.923 mcg/kg/min

The number of mcg/kg/minute = flow rate × concentration ÷ mass of client

Flow rate = 12 ml/hour = 12 ml/hour × 1 hr/60 min = 0.2 ml/min

Concentration = mass of dopamine/volume

where

• mass of dopamine = 400 mg and
• volume = 250 ml

Concentration = 400 mg/250 ml

= 1.6 mg/ml

= 1.6 mg/ml × 1000 mcg/mg

= 1600 mcg/ml

mass of client = 65 kg

Calculating mcg/kg/minute

So, substituting the variables into the equation, we have

mcg/kg/minute = flow rate × concentration ÷ mass of client

mcg/kg/minute = 0.2 ml/min × 1600 mcg/ml ÷ 65 kg

mcg/kg/minute = 320 mcg/min ÷ 65 kg

mcg/kg/minute = 4.923 mcg/kg/min

The mcg/kg/minute the client is receiving is 4.923 mcg/kg/min

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