Hi Everyone,
So...I am in my 3rd semester (just started last week), and I am trying to stay ahead of the game. I'm pretty good with the math, but I'll tell you, I have been sitting here trying to figure out how the heck they get these answers to the PCA pump questions. Is there something I'm missing? Here is an example problem:
Morphine Sulfate: basal rate=2mg/hr
PCA dose=2mg with a lock-out of 6 minutes
(possible dose every 6 minutes for 4 hours)
2mg/hr x 4 hours=8 mg in 4 hrs. from IV
2 mg every 6 minutes (a dose every 6 minutes=60 minutes divided by 6=10 doses/hr)= 2mg x 10 doses=20 mg in 60 min. x 4 hrs=80 mg in 4 hrs
8 mg + 80 mg= 88 mg maximum in 4 hours
This is exactly how the sample problem is presented. Where are they getting 88 mg in 4 hours, if it is 2 mg/hr? I am lost! I am used to dimensional analysis (if it can be figured out that way). Please tell me what I am missing. I've tried finding some web-sites to help, but I can't find anything like this. Thanks again, I appreciate the help.