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A nurse calculates IV infusion rate in drops per minute from a prescription in milliliters per hour. Using dimensional analysis with a 10 gtts/mL tubing, the calculation converts mL/hr to gtts/min by canceling units and dividing by 60 minutes.
A nurse calculates IV infusion rate in drops per minute from a prescription in milliliters per hour. Using dimensional analysis with a 10 gtts/mL tubing, the calculation converts mL/hr to gtts/min by canceling units and dividing by 60 minutes.
That's what's ordered. Okay? That's what we have. That's what's ordered. Now, our IV tubing here is 10 drops per mil. So let's just pause here and take a look at where our equations are. Here's what we need at the end. Gtts, drops per minute. Now, here we have hours and milliliters, right here. So we have milliliters over hours. Somehow we need to get from hours to minutes and milliliters, two drops. Okay? So that's the conversion we're looking for here. So we have one that the problem gives us. It's 10 drops per mil. So when we use that, let's try that one. And when we use it, we will see that we can get our drops. We want drops to be at the top because that's where it is here where we need it at the end. So drops, 10 gtts per 1 mil. And fancy that. Remember, like we said in the first problem, we did, anything that we want to magically erase itself and cancel itself out has to go on the top and the bottom. If you see a unit that is on the top and on the bottom, they get canceled. So milliliters is canceled because it is both on the top and on the bottom. Okay? So now what we have is drops per hours. We currently have drops right here, and we have hours right here. But that's not what we need. We need drops per minute, right? So we have drops solid. We are good to go on that. But the problem still remains. We need minutes. So how do we get from minutes or hours to minutes? Well, we all know that there are 60 minutes in one hour.
