![]() ![]() So dimensional analysis, start with what you are looking for, mL per hour. How should you set the IV pump? Well, IV pump is always what? mL per hour. What we have available is Dopamine 800 mg in 250 mL of D5W. The order is for Dopamine 7.5 mcg per kg per minute IV infusion. Plug your answer back in, does it make sense? All right? Let's work through a couple of these together. Don't rush, make sure that you're being safe in this calculation and getting the right answer at the end of it. And we're going to look at an example of that. ![]() Now some of these problems may have multiple parts so plan ahead, think about what different steps do I need to take. For problems like this, the really complex ones, I highly recommend dimensional analysis, it keeps everything in one place, it prevents you from missing steps. There's going to be a lot of information, and you kind of need to narrow it down. Focus in on what the question is actually asking. So as with every calculation, you always want to make sure that you know what we're looking for. We're going to look at some more complex calculations to kind of work through a few of these together. Greater than 90 seconds: pause infusion for 1 hour, restart at half previous rate.76 – 90 seconds: decrease rate by 2 unit/kg/hr.31-54 seconds: increase rate by 1 unit/kg/hr.Less than 30 seconds: increase rate by 2 unit/kg/hr.Based on the orders below, what should the NEW IV pump rate be? The patient’s PTT returned at 42 seconds. The bag contains 20,000 units Heparin in 500 mL NS. A patient has Heparin infusing at 22.1 mL/hr.Available: 20,000 units Heparin in 500 mL NS. Order: Heparin 12 units/kg/hr IV infusion.Available: Dopamine 800 mg in 250 mL D5W. Order: Dopamine 7.5 mcg/kg/min IV infusion.Plan ahead – may require multiple steps.Prevents skipping steps or missing conversions.Highly recommend using dimensional analysis. ![]()
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