The Nursing Math Thread  page 5
A member pm'd me the following question highlighted below. We created this thread for you guys to talk about math, solve math problems, and post math websites that you have found helpful. I was... Read More


Jul 19, '08Here is a website where math professionals help with everything from Grade School Math to Doctorate Level Math.
www.mathhelpforum.com
They also run a physics forum
www.physicshelpforum.com 
Aug 4, '08can some one tell me how these two problems should be set up?
1.
order: 1250ml in 15h
drop factor: 10gtt/ml
flow rate: 14gtt/min.
after 7h 500ml remain. recalculate in mcgtt/min?
2.
order: 180mg/kg in 1000ml for 100mins.
patient weighs 75kg
calculate in ml/h? 
Aug 4, '08Ok, let's get this straight: Your order is: give 1250ml in 15 hr, drop factor is 10gtt/ml, rate 14gtt/min. After 7hrs 500ml are remaining , recalculate rate.I think you need to focus in what is asking: recalculate the remaining 500ml for the following 7hrs. With the data you have it should be 500ml / 7hr (420min) and multiply by drop factor of 10gtt/ml (500/420x10=11.9=12gtt/min)
In your second problem:
I really do not understand the question, there is something missing. Order 180mg/kg, pt's weight 75kg, 1000 in 100 min? Waht is the concentration of the medication in the 1000ml? or do you need to know how fast you will give the 1000 in 100 minutes (10ml/min) I really do not know whatis the question asking because 180x75=13500 but you cannot do anything else since you do not have the medication concentration.
I am sorry, I try to help, if some one give you a better answer, please let me know! 
Aug 4, '08Quote from mzthang2260#1  15 hours minus 7 hours = 8 hours left for 500 mL to infuse in micro gtts/minute. Microdrip tubing has a drop factor of 60 drops/mL. You must convert hours to minutes. So, your new problem is:can some one tell me how these two problems should be set up?
1.
order: 1250ml in 15 hours
drop factor: 10gtt/ml
flow rate: 14gtt/min.
after 7 hours 500ml remains. Recalculate in micro gtt/min?
2.
order: 180mg/kg in 1000ml for 100 minutes.
patient weighs 75kg
calculate in ml/hour
Amount to give: 500 mL#2  The problem is really quite simple. It is asking you to give 1000 mL in 100 minutes. The amount of the drug to be mixed in the solution is not being addressed and that information is just there to distract you. You need a conversion factor to change the minutes to hours. So,
Drop factor: 60 gtts/mL
Time: 8 hours
500 mL/8 hours (amount to give) x 60 gtts/mL (drop factor) x 1 hour/60 minutes (conversion factor) = 62.5 gtts/minute, roundd off to 63 gtts/minute
1000 mL/100 minutes (amount to give) x 60 minutes/1 hour (conversion factor) = 600 mL/hour (infusion rate) 
Aug 5, '08Quote from DaytoniteThank you, I was confused! I knew I have to calculate the remaining hours (8) but once I started I went back to 7, that's why its very important to double check math questions!! I do have a question, why do I need to change the drop factor to micro (60) since that information was not given in the problem? Should I change it even though it was not given every time that I have results with low gtt/min?#1  15 hours minus 7 hours = 8 hours left for 500 mL to infuse in micro gtts/minute. Microdrip tubing has a drop factor of 60 drops/mL. You must convert hours to minutes. So, your new problem is:Amount to give: 500 mL#2  The problem is really quite simple. It is asking you to give 1000 mL in 100 minutes. The amount of the drug to be mixed in the solution is not being addressed and that information is just there to distract you. You need a conversion factor to change the minutes to hours. So,
Drop factor: 60 gtts/mL
Time: 8 hours
500 mL/8 hours (amount to give) x 60 gtts/mL (drop factor) x 1 hour/60 minutes (conversion factor) = 62.5 gtts/minute, roundd off to 63 gtts/minute1000 mL/100 minutes (amount to give) x 60 minutes/1 hour (conversion factor) = 600 mL/hour (infusion rate) 
Aug 5, '08Quote from B_santafe10ml/min=600ml/hr which is the infusion rate!Ok, let's get this straight: Your order is: give 1250ml in 15 hr, drop factor is 10gtt/ml, rate 14gtt/min. After 7hrs 500ml are remaining , recalculate rate.I think you need to focus in what is asking: recalculate the remaining 500ml for the following 8hrs. With the data you have it should be 500ml / 8hr (480min) and multiply by drop factor of 10gtt/ml (500/480x10=10.4=10gtt/min=60gtt/ml)
In your second problem:
I really do not understand the question, there is something missing. Order 180mg/kg, pt's weight 75kg, 1000 in 100 min? Waht is the concentration of the medication in the 1000ml? or do you need to know how fast you will give the 1000 in 100 minutes (10ml/min= 600ml/hr) I really do not know what is the question asking because 180x75=13500 but you cannot do anything else since you do not have the medication concentration.
I am sorry, I try to help, if some one give you a better answer, please let me know!Last edit by B_santafe on Aug 5, '08 
Aug 5, '08Quote from b_santafethat information was given to you in the problem. the problem said: "recalculate in mcgtt/min". mcgtt, or microdrop tubing, can only be accomplished with pediatric tubing and the drip factor for it is 60 drops/ml. yes, you needed to change the drip rate in order to get the correct answer. the iv in the first problem should have infused at 83cc/hour (1250cc over 15 hours) but "got away" and infused faster than it was supposed to (750cc in 7 hours, or 107cc/hour). so, i would assume that the iv tubing was changed to pediatric drip tubing in order to control the rate of infusion better. that happened in hospitals a lot before all ivs were put on iv pumps.thank you, i was confused! i knew i have to calculate the remaining hours (8) but once i started i went back to 7, that's why its very important to double check math questions!! i do have a question, why do i need to change the drop factor to micro (60) since that information was not given in the problem? should i change it even though it was not given every time that i have results with low gtt/min?

Aug 5, '08Quote from B_santafeThe original post of the problem says recalculate the remaining fluid in mcgtts; that would be microdrops which is a 60gtt/min set...was that a mistype? If not then it is stated in the problem, just in the second half. Sorry I just noticed Daytonite answered this!Thank you, I was confused! I knew I have to calculate the remaining hours (8) but once I started I went back to 7, that's why its very important to double check math questions!! I do have a question, why do I need to change the drop factor to micro (60) since that information was not given in the problem? Should I change it even though it was not given every time that I have results with low gtt/min?Last edit by beth66335 on Aug 5, '08

Aug 5, '08Quote from beth66335No, I just did not pay attention when I was answering the question! so I got confused and got a wrong answer! But now I get itYour original post of the problem says recalculate the remaining fluid in mcgtts...was that a mistype?

Aug 5, '08Quote from B_santafeSorry I just realized you were not the original poster!lol:imbarNo, I just did not pay attention when I was answering the question! so I got confused and got a wrong answer! But now I get it

Aug 5, '08Quote from beth66335That's ok, I was trying to help and then I got everything confused ad gave wrong answers, well at least I realized after I read the posting and I am very grateful that I was corrected! since that made me realized what I did wrong :imbar. I am studying for my final tomorrow and I entered the web and read the problem I though "I can help!" but I did not double check my answers and there you have I WAS GIVING WRONG ANSWERS . Good that my mistake was cleared. :wink2:Sorry I just realized you were not the original poster!lol:imbar

Aug 5, '08Quote from Buttercup_fieldsHey thanks for the site.Hi I found the following site good for IV math problems.
http://www.accd.edu/sac/nursing/math/ivprob.html