Question

Ordered: 1500 mL D5W to infuse in 4hr. How many mL per hr should be delivered? 3. Ordered: Magnesium sulfate 2 g over 4hr for hypomagnesium blood level. Available: 500 mL D5W with 2 g of magnesium sulfate. How many mL per hr should be infused? 10 4. Ordered: 5 g Rocephin IV for bronchitis to infuse in 6hr. Available: 5 g Rocephin in 1000 mL of D5W. How many mL per hour should infuse?

Answer 1

To determine infusion rates, use the total volume divided by the time in hours. For the medications ordered, the rates are 375 mL/hr for D5W, 125 mL/hr for magnesium sulfate in D5W, and approximately 167 mL/hr for Rocephin in D5W.

Step-by-step explanation:

To determine the rate of infusion for each medication, we must use the formula:

Rate of Infusion (mL/hr) = Total Volume (mL) ÷ Time (hr)

Let's calculate the rates for each medication ordered:

1. 1500 mL D5W to infuse in 4 hours:
2. Rate = 1500 mL ÷ 4 hr = 375 mL/hr
3. Magnesium sulfate 2 g over 4 hours with a total volume of 500 mL D5W:
4. Rate = 500 mL ÷ 4 hr = 125 mL/hr
5. 5 g Rocephin IV for bronchitis to infuse in 6 hours with a total volume of 1000 mL of D5W:
6. Rate = 1000 mL ÷ 6 hr = 166.67 mL/hr, which can be rounded to 167 mL/hr.

These calculations are essential for ensuring that patients receive medications at the correct pace to achieve proper therapeutic levels without overloading or under-dosing them.