Using an IV infusion system that delivers 60 drops/mL, the nurse hangs a 500-mL bag of NS at 8 AM. The physician has ordered a rate of 20 mL/hr. The nurse will set the roller clamp to deliver:
1. 10 gtts/minute.
2. 20 gtts/minute.
3. 25 gtts/minute.
4. 30 gtts/minute.
2
20 mL (amount to be infused in 1 hour) ? 60 gtts = 1200 gtts per hour. 1200 gtts/60 minutes in 1 hour = 20 gtts per minute. This roller clamp is an old method to determine rates, but in the case of nonavailability of electronic delivery devices, it is a good thing to know.
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