Answer:
To calculate the starting rate of the heparin infusion, you can use the following formula:
Starting rate (mL/hour) = (Desired dose in units) / (Heparin concentration in units per mL)
In this case:
The desired dose is 18 units per kg for a person weighing 75 kg.
The heparin concentration is 25,000 units per 500 mL.
First, calculate the total desired dose:
Desired dose = 18 units/kg * 75 kg = 1350 units
Now, calculate the starting rate of infusion:
Starting rate (mL/hour) = 1350 units / (25,000 units / 500 mL)
Starting rate (mL/hour) = 1350 units / 50 units/mL
Starting rate (mL/hour) = 27 mL/hour
So, the starting rate of the heparin infusion is 27 mL per hour.