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Basic Infusion( Duration)
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Total infusion volume
______________________=Duration ml/hr to be infused |
Use this formula when you know the volume on hand and the rate at which it is to be infused and you want to calculate how long it will take for the solution to infuse
EXAMPLE: On HAND IS 1000ml of NORMAL SALINE TO BE RUN IN AT 125ml/hr. How long will this infusion Take to complete 1000 ——---=8hours 125ml/hr |
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Hourly Rate(ml/hr):Pump rate
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mL/hr=totalinfusionvolume(mL)
—----------------------------------- Total time of infusion in hours |
Volumes to be infused in greater than one hour
EXAMPLE: On hand is 1000ml of D5W to be run over 8hours. At what rate will you set the pump? 1000mL –---------=125mL/hr 8hr |
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Hourly Rate(mL/hr) :Pump rate
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ml/hr= total infusion volume(mL) *60minutes
—----—--------------------------- Total time of infusion in minutes |
Volumes to be infused in less than one hour
EXAMPLE: Calculate the infusion rate for 60mg of Gentamycin to be delivered in 100mL of Normal Saline (IVPB) infused over 30mins 100mL*60mins ----------------------= 200ml/hr 30 mins |
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Flow Rate or Drip Rate(gtts/min)hou
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Vol to be infused (mL/hr) * drop factor(gtts/mL)
---------------------------------------------- Time in minutes (60min or less |
Example:
You are deliver 1000mL D5W over 8hours. What will flow rate be using tubing with drip factor 10gtt/mL? Step #1: 1000mL ------------= 125mL/hr 8hrs Step #2: 125mL/hr *10gtts/mL ---------------------------21gtts/mins 60mins |
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Hourly Dose Calculations
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Desired Dose(D)
--------------------- * Vehicle=mL/hr Dose on Hand |
Use this formula for calculating
Hourly infusions of medication EXAMPLE: You are to administer Heparin 1200 units/hour by continuous IV drip. Available Is 1000mL of of D5W containing 24,000 units of Heparin. Calculate the pump rate(mL/hr) 1200units --------------*1000mL =50mL/hr 24,0000 |
