Your patient has hypertension during labour; she has been prescribed an infusion of hydralazine 60 mg in 60 mL sodium chloride 0.9%. The prescription asks you to administer 6 mg/hr. What is the rate in mL/hr?
Question
Your patient has hypertension during labour; she has been prescribed an infusion of hydralazine 60 mg in 60 mL sodium chloride 0.9%. The prescription asks you to administer 6 mg/hr. What is the rate in mL/hr?
Solution
To calculate the rate in mL/hr, you need to know how many mg of hydralazine are in each mL of the solution.
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First, calculate the concentration of the hydralazine in the solution. You have 60 mg in 60 mL, so the concentration is 1 mg/mL.
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The prescription asks you to administer 6 mg/hr. Since the concentration of the solution is 1 mg/mL, you need to administer 6 mL/hr to deliver 6 mg/hr.
So, the rate is 6 mL/hr.
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