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EXPLANATION
✔Correct answer:
32 drops per minute. To calculate the correct IV drip rate, Nurse Carla needs to use the following formula:
Drip Rate (drops/min) = (Total Volume (mL) / Total Time (min)) × Drop Factor (drops/mL)
Step-by-Step Calculation:
1. Total Volume: 1,000 mL
2. Total Time: 8 hours, which needs to be converted to minutes.
8 hours × 60 minutes/hour = 480 minutes
3. Drop Factor: 15 drops per mL
Now, plug these values into the formula:
Drip Rate = (1,000 mL / 480 min) × 15 drops/mL
4. Calculate the Volume per Minute:
1,000 mL ÷ 480 min = 2.08 mL per minute
5. Calculate the Drip Rate:
2.08 mL per minute × 15 drops/mL ≈ 31.25 drops per minute
Rounding to the nearest whole number, Nurse Carla should set the IV drip rate to approximately 32 drops per minute.
Think of this calculation like watering a garden. If you need to deliver a specific amount of water over a set time, you’d adjust the flow to match that target. Similarly, Nurse Carla adjusts the IV drip rate to ensure the patient receives the fluid at the correct pace.
Nurse Carla should also:
- Double-check the prescribed infusion rate to confirm accuracy.
- Periodically monitor the IV flow rate to ensure it remains at the correct pace throughout the infusion.
- Inspect the IV site regularly for signs of infiltration, phlebitis, or other complications.
- Adjust the flow rate as needed if there are any interruptions in the infusion.
✘Incorrect answer options:
15 drops per minute. This rate would deliver only half of the required volume over 8 hours, leading to an incomplete infusion.
21 drops per minute. This rate would deliver less than the required amount and result in a slower infusion, so the patient would not receive the full 1,000 mL over 8 hours.
125 drops per minute. This rate is too high and would complete the infusion far too quickly, potentially overloading the patient with fluids in a short time.
References
- Kee, J. L., & Marshall, S. M. (2015). Clinical Calculations: With Applications to General and Specialty Areas. Elsevier.
- Potter, P. A., & Perry, A. G. (2016). Fundamentals of Nursing. Elsevier Health Sciences.