Evolve HESI Practice Exam

What is the correct ml/hr rate for an IV infusion of terbutaline sulfate prescribed at 30 mcg/min?

1. 150 ml/hr

2. 180 ml/hr

3. 200 ml/hr

4. 250 ml/hr

The correct answer is: 180 ml/hr

To find the correct mL/hr rate for the IV infusion of terbutaline sulfate prescribed at 30 mcg/min, you first need to convert the dosage from micrograms to milliliters based on the drug's concentration. Assuming terbutaline sulfate has a common concentration of 1 mg/mL (which is equivalent to 1000 mcg/mL), you can use the following steps: 1. Convert the prescribed rate from mcg to mg: - 30 mcg/min is equal to 0.03 mg/min. 2. Determine how many milliliters of the drug will be needed per minute: - Using the concentration of 1 mg/mL, you would calculate: - 0.03 mg/min * (1 mL/1 mg) = 0.03 mL/min. 3. Convert the infusion rate from mL/min to mL/hr: - Since there are 60 minutes in an hour, multiply the result by 60: - 0.03 mL/min * 60 min/hr = 1.8 mL/hr. However, the concentration can vary depending on the specific formulation prescribed. If, hypothetically, the drug concentration was higher