ack! truesn beat me to the posting. i was off line typing out how to work out the problems for you. i'll go one better however and give you three websites to check out. the first will explain how to set these problems up and the second has lots of practice problems with the answers. however, they don't give the step-by-step solutions. i strongly suggest that you set aside of block of 3 or 4 hours and hunker down to figure out how to work these problems, or you will never learn them. once you think you've "got it" try changing the problems around so you have to find ml/hr rather than gtts/min until you have this nailed down. another way to turn a problem around is to be told you want to give xxmg of a drug at xxml an hour. you have a 500ml bag of solution. how many mg must you add so the bag lasts 8 hours? math requires that you work problem after problem or you will never truly understand what you are doing. i was taught this basic formula that works for tablets and liquids: dose desired divided by dose on hand times the amount you have available. problems should be set up as ratios with labels on the numbers so the labels cancel each other out until you get the label you want on the final answer. the other thing i was taught as a short cut years ago when working with drip factors of tubings when we had to regulate drip rates and did not use pumps. figure out the amount in ml you want to give per hour and then divide by 3 (for a 20gtts/min tubing), 4 (for a 15gtts/min tubing), 6 (for a 10gtts/min tubing) or 60 (for a 60gtts/min tubing). it cuts two ratios down into one ratio very quickly when working these problems.
now, here are the answers:
1. 67 gtts/min
the equation is:
[1 hour divided by 60 minutes] multiplied by [100ml (amount desired) divided by .25 hour] multiplied by [10gtts divided by 1ml] = 66.6666gtts/min or 67gtts/min
the equation is:
[1100 units(dose desired) divided 1 hour] quantity multiplied by [500ml (amount) divided by 50,000 units (dose on hand)] = 11ml/hr
convert .5g to 500 mg before working problem
then equation is:
[50ml divided (amount desired) by 1 hour] multiplied by [500mg divided by 500ml (amount on hand)] = 11ml/hour
these problems are set up so that the labels attached to the numbers cancel out to give you the final labels that you want on the final answer as the problem asks you for.
here are the web sites:
- a wonderful site with practice problems of iv calculations. answers are provided, but not the step-by-step solutions. just click on the links provided.
dales place math help for nursing math. knock yourself out on this site.