[LoriRN2B]

Originally Posted by Priddyeyez

not completely sure that this is right- I used manuels web.

3000mL D5W over 24 hours.
Drop Factor: 10

1. ____mL/hr answer is- 125
2. ____gtt/min

how do I get the answer to drop factor??

what is D5W?

I am not very good at setting these up online, but I will do my best to explain it. Daytonite will probably chime in here, she is awesome at setting the problems up, helped me a lot by reading her explanations. If you get a chance, read the rest of this post, I am betting you will find she has already answered this question before.

Anyway... here is how I set these up.

Total ml X drop factor ~over~ total hours x 60.

In your problem, 3000 X 10 = 30000 24 X 60 =1440 (the 60 is because there are 60 minutes in one hour) Then 30000/1440= 20.8. Since we cannot account for less than one whole drop, we round. Therefore, 20.8= 21. So youre answer is 21 gtt/min.

Oh, and D5W is Dextrose 5% in Water

Hope this helps!

[Daytonite]

Yes! LoriRN2B calculated that correctly. It actually the same as the problem I did just above it. Here is what it looks like in dimensional analysis so that the labels get factored out and you are left with gtts/min in the final answer:

3000 mL/24 hours (amount to infuse) X 10 gtts/1 mL (drip factor of tubing being used) X 1 hour/60 min (conversion factor) = 20.8333 gtts/min = 21 gtts/min (rounded off)

5% Dextrose in Water is a standard IV fluid that is used in IV therapy.

[trilli18]

Hi all,
I had a math exam in my math for health science class -which i think i did ok but would like someone to review my answers and if they are wrong can u please correct with the proper way to do them so I will know for next time. Can someone check these and let me know. Thanks for all ur help this site is a blessing in a half.

1. O: streptomycin sulfate 800mg
h: streptomycin injection 1g/2.5ml

this is what i did --- 1g = _1000mg__ = 1000mg,
1g

800mg/1000mg X 2.5ml = 2ml, standard syringe

0.5752. O: Prostigmin 0.4 sc Q6h
Hrostigmin 1:4000 sol

this is what i did ----
ratios 1g/4000ml, 1g=1000mg/1g = 1000mg ~ 0.4mg X 4000ml/1000mg = 1.6 and u would use stan eoiodard syringe

3. o:Epogen 2300U
H:Epogen 4000U/ml

this is what i did 2300u/4000u X 1ml = 0.575ml, umg/se a tuberculin syringe

4. Oilaudid 0.8mg sc q4h Prn/Pain
H: 2mg/ml

this is what i did --- 0.8mg/2mgX1ml = 0.4ml, tuberculin syringe


5. O: Tigan 200mg deep IM/TID
H: Tigan 100mg/ml for injection
this is what i did ---- 200mg/100mg X 1ml = 2ml, standard syringe

6. Calculate flow rate to nearest drip factor, this is what i did
1800ml X 10 gtt/Ml
_________________
12h (720min) = 25 gtt/min

7. calculate flow rate
100ml o.45%NS Q8h (infusion pump)
this is what i did---- 1000ml/8hrs = 125ml/h

8. original flow rate and adjustment can is adjustment safe to do

1200ml 8h 10gtt/ml, after 3hrs 500ml has infused

this is what i did ---- 1200ml/8h = 150ml/h
150ml/h X 10gtt/ml / 1h
_________________________
60 = 25 gtt/min

then did this 1200 - 500 =700ml
8hrs - 3hrs = 5 hrs

700ml/5hrs = 140ml/h

140ml/h X 10gtt/mlX1h
_________________
60 = 23gtt/min

and i wrote yes can do adustment safely


9. find when infusion will be complete
o:750 ml RL @ 50ml/h your start time is 1000

this is what i did
750 ml / 50ml/h = 15hrs ~ 1pm, 1300


10. Total volume to administer
O:NS at 125ml/h over 7 hrs 30min.
*** this one is was stuck on for a while

but this is what i put 125ml/h X7h = 875

875/30min = 29ml/min

[trilli18]

working on some hw and am stuck can't figure this out, can some help me please!!!!!

I have to determine if the order is safe. If it is then determine the amt to administer.
the pt is a 3day old newborn who weighs 6lbs 5oz
O: Nebcin 5mg Im q 12h
H:Nebcin mult. dose vial 20mg/2ml
According to the package insert, a premature or full - term neonate up to 1 week of age may be administered up to 4mg/kg/day in 2 equal doses q 12 hrs.

This is what i have done so far : 5oz = 1lb
____ = 0.3125 lbs
6lbs + o.3125 = 6.31 lbs 16oz
6.31lbs /2.2x1 = 2.87kg
5mg/20mgX 2ml = o.5ml which is the amt to administer but now stuck not sure how to go about the rest

If someone can please get back to me tonight thanks so much

[Daytonite]

I have to determine if the order is safe. If it is, then determine the amount to administer. The pt is a 3-day old newborn who weighs 6lbs 5oz

O: Nebcin 5mg Im q 12h
H: Nebcin multi-dose vial 20mg/2ml

According to the package insert, a premature or full - term neonate up to 1 week of age may be administered up to 4mg/kg/day in 2 equal doses q 12 hrs.

First order of business is to determine the normal safe dose. In order to make any kind of comparison you have to convert the baby's weight to kilograms. To do that, I am first going to converting the baby's weight to kilograms by applying two conversion factors. One to change pounds and ounces to ounces only and then to change the ounces to kilograms.

16 ounces = 1 pound, so 6 pounds X 16 ounces + 5 ounces = 101 ounces (baby's total weight in ounces)

Then, change the weight from ounces to kilograms:

101 ounces/1 (baby's weight in ounces) X 1 pound/16 ounces (conversion factor) X 1 kilogram/2.2 pounds (conversion factor) = 2.8693 kilograms

You were told the safe dose is 4 mg/1 kg/1 day/12 hours. If you divide 4 mg/1 kg into two doses, you get 2 mg/1 kg per dose as the safe dose. Use a ratio to figure the baby's safe dose, since you now know the baby's weight in kilograms:

2 mg Nebcin/1 kilogram (safe dose) = X mg Nebcin/2.8693 kilogram (safe dose for your baby), cross multiply. You get X = 5.7386 mg

This is telling you that the safe dose for a baby that weighs 2.8693 kilograms (or, 6 pounds 5 ounces) is 5.7386 mg. Compare this to the dose the doctor ordered which is 5 mg. So, the answer to the first part of the question is: Yes, the order is a safe dose.




The second part of the question is to determine the amount (in mL) to administer. This, very simply, is a dose desired divided by dose on hand formula calculation:

5 mg/1 (dose desired) X 20 mg/2 mL (dose on hand) = 1/2 mL or 0.5 mL (after completing the math and canceling out the labels).

The amount you will administer is 0.5 mL of Nebcin.

[Daytonite]

Ordered: streptomycin sulfate 800mg
On hand: streptomycin injection 1gram/2.5 mL

800 mg/1 (dose desired) X 2.5 mL/1 gram (dose on hand) X 1 gram/1000 mg (conversion factor) = 2 mL

Ordered: Prostigmin 0.4 subcutaneously Q6h
On hand: Prostigmin 1:4000 solution

Parameters of problem not clear.

Ordered: Epogen 2300 units
On hand: Epogen 4000 units/mL

2300 units (dose desired) X 1 mL/4000 units (dose on hand) = 0.575 mL = 0.6 mL (rounded off)

Ordered: Dilaudid 0.8 mg subcutaneously q4h prn pain
On hand: Dilaudid 2 mg/mL

0.8 mg/1 (dose desire) X 1 mL/2 mg (dose on hand) = 0.4 mL

Ordered: Tigan 200 mg deep IM TID
On hand: Tigan 100 mg/1 mL for injection

200 mg/1 (dose desired) X 1 mL/100 mg (dose on hand) = 2 mL

Calculate the drip rate for 1800 mL to be infused over 12 hours using IV tubing that delivers the fluid at 10 gtts/min.

1800 mL/12 hours (dose desired) X 10 gtt/1 mL (drip factor) = 25 gtts/hour

Calculate flow rate for 1000 mL of 45% NS to be given q8h by infusion pump

This is a simple ratio that is reduced to lowest terms: 1000 mL/8 hours = 125 mL/1 hour

You are to give 1200 mL of an IV fluid over 8 hours with 10 gtt/mL IV tubing. After 3 hours, 500 mL has infused. What was the flow rate during those 3 hours that the 500 mL infused and what adjustment to the flow rate do you need to make to infuse the remainder of the IV fluid safely?

500 mL/3 hours = 166.6667 mL/hour
1200 mL (total amount to give) minus 500 mL (already given) = 700 mL (remaining to be infused)
700 mL/5 hours (remaining amount and time to be infused) X 10 gtts/1 mL X 1 hour/60 minute (conversion factor) = 23 gtts/minute, and yes, you can do the adjustment safely.

Total volume to administer
O:NS at 125ml/h over 7 hrs 30min.

Have no idea what problem #10 is asking! Sorry!

[Daytonite]

Originally Posted by trilli18

Hi All,
I have been on some math problems for a couple of days now and am unable to figure out how to solve this problem, If any of u know can u please respond and show me how its done.
I need to determine if the dosage ordered is safe.
* The patient is a 92yr old female, 5ft 6in. tall, 130lb, and CLcr of 61 ml/min. Patient is in ideal wgt range.
Order: Amikacin 375mg IM Q12H
According to the Package insert, pt. with normal renal function may be administered 7.5mg/kg q12h or 5mg/kg q8h. This patient has normal renal function.

Thanks for your help with this I have a bunch of these problems to do, but have been unsuccessful in figuring out how to answer it. I think If I see one done I will be able to accomplish the rest on my own. Thanks again.

You asked how to do the same kind of problem in post #78 on this thread. A step-by-step explanation of how to approach and answer this kind of problem was given to you in post #79. Please review that post. This is the very same type of problem. The only thing that is different is the numbers.

[Daytonite]

Originally Posted by ~JR~

What's the formula for figuring out mls per drop?

I believe what you are talking about is the conversion factor:

15 drops or minims = 1 mL

[Daytonite]

Originally Posted by ~JR~

A post surgical patient is currently having an infusion of Hartmann's Solution of 6/24 rate or 56 drops/min via a macro giving set. Upon returning to the ward you read the post op orders and notice an order that states when Hartmann's runs through, a 5% Dextrose bag is to be commenced. The current infusion had 300ml remaining how long will it take for that infusion to finish?

Assuming that what is meant by a macro set means it is delivering at the rate of 10drops/mL, you want to end up with an answer providing you with a label of "minutes" or "hours". The problem would be worked out like this:

300 mL (amount to be given) X 1 minute/56 drops (rate of infusion) X 10 gtts/1 mL (drip factor of IV tubing being used) = 53.571428 minutes (after canceling out labels repeated in numerators and denominators and doing the mathematics) = 54 minutes (rounded off)

FYI: This IV is running at 336 mL/hour. This is pretty fast for an IV, but may not be totally unusual for an immediate postop.

[Daytonite]

Originally Posted by gemini_star;[B

IV amniphylline 750mg in 1000ml D5W at 50 mg/hr. Tircacillin 1g IVPB via heparin lock every 6h. Stock available: Ticarcillin 1g per 50ml D5W. Administer over 30 mins – 2 hrs. Aminophylline stock: 500mg/20ml (25mg/ml)[/b]

1) How many ml of aminophylline must be needed to 100ml of D5w to produce the ordered concentration?
Answer: 30 ml Aminophylline correct!


2) What rate (ml/hr) is needed to administer 50mg of aminophylline per hr?

50 mg/1 hour (dose desired) X 1000 mL/750 mg (dose on hand) = 67 mL/hour (rounded off)

3) Using minidrop tubing how many ugtts/min are needed to administer aminophylline?

67 mL/1 hour (dose desired) X 60 gtts/1 mL (drop factor of IV tubing) X 1 hour/60 minutes (conversion factor) = 67 gtts/1 minute (drip rate)

4) The ticarcillin piggyback contains how many cc of IVF?
Answer: 50 ml

5) What is the minimum infusion time for ticarcillin?
Answer 30 mins

6) What is the maximum infusion time for ticarcillin?
Answer: 2 hours
The information I have on IV ticarcillin (2007 Intravenous Medications, 23rd edition, by Betty L. Gahart and Adrienne R. Nazareno, page 1203) is that it can be infused over 30 minutes to 2 hours, so I think your answers are correct unless your instructors are basing the correct answer on their own sources.

7) Using an infusion set that delivers 15 gtts/ml, determine the gtts/min needed to administer the ticarcillin over:
A) 30 minutes = 25gtts/min
B) 1 hr = 12.5gtts/min
C) 2 hrs = 6.25 gtts/min

Round your answers off in #7. There's no such thing as 12.5 drops or 6.25 drops. So, "B" should be 13 gtts/min and "C" should be 6 gtts/min.