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Calculate the starting flow rate for this patient.

Ordered: Dopamine: Begin infusion of 2 mcg/kg/min for bradycardia and systolic BP less than 90. Increase infusion up to 10 mcg/kg/min as needed.

You have a premixed bag of dopamine with 250 mg in 500 mL of D5W. The patient weighs 185 lb.

Answer :

Final answer:

To calculate the starting flow rate, we first convert the patient's weight from pounds to kilograms and calculate the dosage in micrograms per minute. We then determine the concentration of dopamine in the solution and use these values to calculate the flow rate in milliliters per minute.

Explanation:

The subject of this question is medication dosage calculation, sometimes referred to as flow rate calculation in the field of medicine. In this case, we are asked to calculate the starting flow rate of dopamine for a patient. The ordered dosage is 2 mcg/kg/min. First, it's necessary to convert the patient's weight from pounds (lb) to kilograms (kg). This is done by dividing the weight in pounds by approximately 2.2. Therefore, the patient's weight in kilograms is approximately 84 kilograms (185 lb / 2.2 = ~84 kg).

Now, we can calculate the dosage in mcg per minute, by multiplying the dosage in mcg/kg/min by patient's weight in kg. Hence, 2 mcg/kg/min * 84 kg = 168 mcg/min.

The solution bag contains 250 mg of dopamine in 500 mL of D5W. A critical part of this calculation is to note that 1 mg equals 1,000 mcg, which means that we had 250,000 mcg of dopamine in 500 mL. Therefore, there is therefore 500 mcg/mL (250,000 mcg / 500 mL).

To achieve an infusion rate of 168 mcg/min, we would therefore require approximately 0.336 mL per minute (168 mcg/min divided by 500 mcg/mL). Thus, the starting flow rate for this patient should be approximately 0.336 mL/min.

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