Chapter 6: Calculation of Basic IV Drip Rates; Henke’s Med Math – Flashcards
47 test answers
Unlock all answers in this set
Unlock answers 47question
0.9% Normal Saline in water (normal saline)
answer
0.9% NS
Unlock the answer
question
0.33% Normal Saline in water (1 /3 normal saline)
answer
0.33% NS
Unlock the answer
question
0.45% Normal Saline in water (1 / 2 normal saline)
answer
0.45% NS
Unlock the answer
question
When the set is small, and the drops are small as well all sets deliver 60 drops per mL (60 gttt/mL)
answer
Microdrip
Unlock the answer
question
Infusion sets without a small needle the package label will always state the drops per mL for this infusion set.
answer
Macrodrip
Unlock the answer
question
The tubing factor for this is 60 gttt/mL. to solve with an Infusion pump use this formula: number of ML ordered --------------------------- = ml/Hour number of hours to run
answer
Infusion pumps
Unlock the answer
question
Every Iv must be labeled so that any professional can check both the fluid that is being infused and the drip rate. A typical order includes the following information: *patient name *room *bed number *date *time
answer
Labeling Ivs
Unlock the answer
question
PATIENT NAME: BRIYANA JACKSON ROOM: 1234B BED NUMBER: 2 DATE: 8/26/15 TIME: 1306 (1:06PM)
answer
Example: Label the IV Order: 500 mL D5W 1 / 2 NS Rate: 50 mL/hr.
Unlock the answer
question
Calculation Number of mL to infuse x TF ----------------------------------- = Drops per min (gtt/min) Number of minutes to infuse
answer
Calculating Basic IV Drip Rates
Unlock the answer
question
there are 20 gtt/min 120 mL x 10 gtts ------------------- = 20 gtt/min 60 mintues
answer
Example: Order: Infuse 120 mL of IV Fluid over 60 minutes with a tubing factor of 10 drops per mL. solve this calculation.
Unlock the answer
question
total number of mL ordered -------------------------------- = mL/hr. number of hours to run
answer
Solving IV calculations Using an Infusion Pump
Unlock the answer
question
run 120mL/hr. 120 mL --------- = 120 mL 1 hour (60 min= 1 hour)
answer
Example: Order: Infuse 120 mL of Iv Fluid over 60 mins. Infusion pump Included
Unlock the answer
question
Drip rates are always rounded to the nearest whole number unless using an infusion pump that can infuse in tenths or hundredths.
answer
REMEMBER:
Unlock the answer
question
* IV is administered for a long time *a small amount is being infused *the macrodrops are to few
answer
Use microdrip when:
Unlock the answer
question
*the order specifies a large amount over a shorter period of time *the microdrips per min are too many, and counting the drip rates becomes to difficult.
answer
Use Macrodrop when:
Unlock the answer
question
83 mL/hr 1000 mL ----------- = 83.333 rounds to just 83 (round to whole#) 12 hours
answer
Example: Order: 1000 mL D5W IV 8AM-8PM Available: an infusion pump How long is it running?: 12 hours
Unlock the answer
question
Micro: 500 mL x 60 gttt ------------------- = 125 gttt/min 240 min (60 x 4) Macro: 500 mL x 20 gttt ------------------ = 41. 6 or 42 gttt/ min 240 min Choose either one label the IV set the drip rate
answer
Order: 500 mL NS iv 12 Noon- 4pm Available: microdrip at 60 gttt/mL; macrodrip at 20 gttt/mL How long will the IV run? 4 hours Because there us no pump available, the nurse must choose the drip factor. Solve for both drip factors and choose one. Round to the nearest whole number
Unlock the answer
question
Micro: 500 ml x 60 gttt ------------------ = 21 gttt/ min 1440 min Macro: 500 mL x 10 gttt --------------------- = 3 gtt/min 1440 min Choose the Micro why? it;s being administered for a long period of time a small amount is being infused the macrodrips are to few
answer
Order: 500 mL D5W IV KVO for 24 hours Available: microdrip at 60 gttt/min; macro at 10 gttt/min How long will it run? 24 hours or 1440 minutes Work out the problem and figure out which tubing is best to use for this patient.
Unlock the answer
question
Knowing how long an IV will last will prepare you for whether the IV is moving to fast or slow, or whether you need to prepare the next IV Number of mL ordered -------------------------- Number of mL per/Hr.
answer
Determining Hours an IV will Run
Unlock the answer
question
Run for 6.7 hours or 6 hours and 42 minutes (take .7 x 60 = 42 minutes) 500 mL ---------- = 6.7 Hours 75 mL
answer
Example: Order: 500 mL NS IV ; infuse at 75 mL/hour
Unlock the answer
question
No math is needed. the Iv will last for 12 hours
answer
Order: 1000 mL 1/2 NS iv 8am-8pm
Unlock the answer
question
it will run for 10 hours 500 mL ---------- = 10 Hours 50 mL in this example the amount of drug is not needed for the calculation of IV Rate
answer
Order: 500 mg in 500 mL D5W IV at 50 mL/hour
Unlock the answer
question
When a continuous IV order includes a medication, generally this medication arrives already premixed in the infusion bag or the pharmacist can add it on site. Sometimes as the nurse, we have to add the medication ourselves and determine the rate of flow. if this happens: first calculate how much of the medication to add to the IV fluids then calculate the drip rate.
answer
Adding Medications to IVs
Unlock the answer
question
Add 10mL to the Iv bag 20 mEq ------------ x 20 mL = 10 mL 40mEq Micro: 1000 mL x 60 ------------------ = 83 gtt/min 720 min Macro: 1000 mL x 20 ------------------ = 28 gtt/min 720 min
answer
Example: Order: 1000 mL D5W with 20 mEq KCl IV 10 am- 10 pm Available: a vial of KCl 40 mEq/20 mL; Micro 60gtt/min, macro 20 gttt/min How long it's running?: 12 hours or 600 mintues Calculate how many mL to add to the IV Fluids first, then solve both tubing's and pick which one you want to use.
Unlock the answer
question
add 2.5 mL to the Iv 250 mg / 1000 mg x 10 mL = 2.5 Micro: 50 x 60 ----------- = 50 60 min
answer
Order: 250 mg in 250 mL ; run at 50 mL/hour for 1 hour Available: ampule labeled 1 g in 10 mL; Microdrip 60 gttt/min
Unlock the answer
question
Some Iv medications are given not continuously but intermittently such as every 4,6,8 hours. this is known as IVPB. To solve IVPB problems, you can use the calculation much like the one needed for the IV: mL x TF ------------ = gtt/min minutes mL= given TF= normally macro, but given min= this may or may not be given, when it is not given however follow this general rule for adults; allow 30 mintues for ever 50 mL of solution.
answer
Medications for for Intermittent IV administrations
Unlock the answer
question
give 17 gtt per min 50 mL x 10 ------------ = 17 gtt/min 30 mintues
answer
Example: Order: 1 g IVPB Supply: Package insert IVPB dilution. Reconstitute with 50 to 100 mL of sodium Cl injection. Use a 50 mL bag of D5W. No time was given so use 30 min for 50 mL.
Unlock the answer
question
21 gtt/ min 250 ml x 10 --------------- = 21 gtt 120 min
answer
Order: 1 g in 250 mL IVPB 7am Supply: 500 mg powder reconstitute with 10 mL sterile water to yield 50 mg/ mL Tubing factor: 10 gtt/ mL Package insert directions: 250 mL D5W Run over 2 hours
Unlock the answer
question
When your using an infusion pump for IVPB, solve the problem by setting the TF to 60 gtt
answer
FACT!!
Unlock the answer
question
Diluting tube feeding involves mixing the nutritional supplement with a specific amount of water. the most common dilutions are: 1/2 strength 1 / 4 strength (one quarter) 1/3 strength (three quarter)
answer
Dilution Calculations
Unlock the answer
question
Take the strength of the volume and multiply them together example: 1/4 x 250 mL= 62.5 mL Subtract your volume from this number 250 mL - 62.5 mL = 187.5 mL The number you get tells you how much water to add to the feeding bag, then infuse at the hour given.
answer
To solve Dilution Problems:
Unlock the answer
question
Add 125 mL of water 1 /2 x 250 = 125 250 - 125= 125 mL
answer
Example: Prepare 1 / 2 of Isocal at 60 mL/hour. Total volume will equal 250 mL
Unlock the answer
question
Add 62.5 3 /4 x 250= 187.5 250 - 187.5 = 62.5 mL
answer
Prepare 3 /4 Isocal at 6o mL/ Hour. Total volume will equal 250 mL
Unlock the answer
question
Usually when a IVPB is infusing, the PRIMARY stops infusing. After the IVPB is completed, the primary IV flow begins again.
answer
Recording Intake
Unlock the answer
question
11 hours x 50 of primary IV = 550 1 HOUR of IVPB x 100 = 100 --------------------------------------- 12 hours= 650 mL intake.
answer
Example: The primary IV is infusing at 50 mL/hour. For 12 hours, the IV intake would be 600 mL (12 x 50 = 600). If you administer an IVPB of 100 mL once during the 12 hours and infuse the IVPB at 100 ml /hour, then your intake would be as follows:
Unlock the answer
question
900mL ----------- = 9 HOURS 100 ml 9 AM + 9 HOURS = 6 PM
answer
A total of 900 mL of an IV solution is to infuse at 100 mL/ hour. If it is 9 am when the infusion starts, at what time will it be completed?
Unlock the answer
question
75 x 4 = 300 mL (24 hours/ 6 hours is 4 times 75 mL is being infused over 24 hours) 125 x 20 = 2500 mL answer is 2800mL
answer
A patient/ client is receiving an antibiotic IVPB in 75 mL q6h to run over 1 hour plus a maintenance IV of 125 mL/hour. What is the 24 hour intake parenterally?
Unlock the answer
question
10000 x 10 -------------- = 21 gtt/min 480
answer
An IV of 1,000 mL is infusing at 10 microdrips per min. what is the intake for 8 hours?
Unlock the answer
question
80 mL 10 microdrips x 8 = 80 mL
answer
An Iv of 1000 mL is infusing at 10 microdrips per min. what is the parenterally intake for 8 hours?
Unlock the answer
question
The IV is 0.5 g or 500 mg in 500 mL. this is equal to 1 mg= 1 mL the patient receives 50 mL per hour so he or she receives 50 mg each hour
answer
A doctor orders 500 mL with aminophyllline 0.5 g to infuse at 50 ml /hour. How many milligrams will the client receive each hour?
Unlock the answer
question
50 x 3 = 150 (24 hours divided by 8 = 3, that's 3 times 50 mL was infused in 24 hours) 100 x 21 = 2100 (24-3 times it was given) answer is 2250
answer
A patient is receiving an antibiotic IVPB in 50 mL q8H to run over 1 hour plus a maintenance IV of 100 mL/ hour. What is the 24 hour parenterally intake?
Unlock the answer
question
250 x 4 = 1000 (24 / 6=4, 4 times 250 mL was infused in 24 hours) Answer is 1000 mL
answer
A patient is receiving an antibiotic IVPB in 250 mL q6h. What is the 24 hour parenterally intake?
Unlock the answer
question
The IV is 100 units in 100 mL or 1 Unit/mL. They receive 10 mL per hour so he or she receives 10 units each hour 100 ------ = 1 unit/ mL x 10 = 10 units 100
answer
A physician orders 100 units of regular insulin in 100 mL to infuse at 10 mL per hour. How many units will the patient receive each hour?
Unlock the answer