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25 Cards in this Set
- Front
- Back
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fractional distillation
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1 cubic square foot of liquid oxygen is 861 feet gaseous oxygen
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hospital supply of O2
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liquid O2 vaporized and piped into hospital oxygen systemat 50 psi- this is REDUCE with a flow meter or REDUCING valve
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Flow Meter
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Also called regulator or reducing valve.. This is what you attach the "tree" too. They operate by restricting the flow with a variable orifice. common types : Bourdon gauge and Thorpe gauge
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Thorpe gauge aka Thorpe tube meter
& pressure compensation test |
from 50 PSI gas source
most are "pressure compensated" meaning they read accurately in the face of back pressure how to check? kink the tubing. it will drop to 0 |
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Bourdon gauge
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small gauge for use on O2 cannister; used when transporting pt... DO NOT USE WITH NEBULIZERS OR ANYTHING THAT INCREASES "DOWN STREAM PRESSURE." it will give a false flow reading
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High Flow and Low flow devices
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low flow devices.. fio2 is not guaranteed and may NOT meet pt inspiratory demands
high flow devices: more accurate and typically provide enough flow to meet inspiratory demands |
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HIGH FLOW does not necessarily mean HIGH FiO2 !!!
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HIGH FLOW does not necessarily mean HIGH FiO2 !!!
(entrainment) |
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Air entrainment ... inevitable but reducible
room air dilutes the Fio2 |
Room air entering into oxygen delivery...
eg nasal cannula... factor in the 21% room air mixing in with the 100% o2 at 2 litres |
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high flow limits what?
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air entrainment
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nasal cannula
delivered fio2 depends on which two factors? |
set flow and patients inspiratory flow... if someone is breathing very fast and deep, this increases air entrainment and dilutes fio2
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bubble humidifier for O2
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pop off set at 2 psi
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simple oxygen mask
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5 - 12 litres per minute LOW FLOW
delivery range : 30 - 60 % O2 (depending on pt demands) MIN. of 5 TO PREVENT CO2 REBREATHING!! USE for SHORT PERIOD OF TIME!!! |
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why a minimum of 5L for SIMPLE FACE MASK??
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MIN. of 5 TO PREVENT CO2 REBREATHING!!
use for a SHORT TIME ONLY |
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ANY MASK... THINK :
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CO2 rebreathing
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partial rebreather mask
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LOW FLOW (8 - 15 litres per minute), 40-70%
reservoir bag must be at least HALF FULL during inspiration 1st 1/3 of expired gas enters reservoir bag |
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partial rebreather mask... NO ONE WAY VALVE
this means: |
half of co2 back into bag
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if partial rebreather mask bag COLLAPSING
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not providing enough FLOW and patient will retain co2 and impact resp drive
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NON REBREATHER MASK
IT HAS A ONE WAY VALVE , three actually |
upper 2 valves open away- gas escape and NO entrainment or newer ones .... ONE upper in and ONE upper out
bottom valve opens toward pt to deliver gas |
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NON REBREATHER MASK setting? fio2??
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set to 10-15 litres
60 - 80 % fio02 |
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non rebreather mask
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short term
but if using for extended period of time HUMIDIFY |
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venturi mask aka venti mask
(DOES NOT NECESSARILY MEAN HIGH fio2) |
different color adaptors onto tube
different holes on adaptors = different delivery holes called "jets" ports on sides of adaptors "entrainment ports" amount of air entrained is dependent on SIZE OF JET the smaller the jet the more room air entrained in (due to drop in negative pressure) |
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never block the entrainment ports
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never block the entrainment ports
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what happens when entrainment ports blocked?
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fio2 will INCREASE but will not be accurate to your flow meter
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what happens if venti tubing kinked?
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flow backs up, entrainment ports do NOT suck up air, and entrainment will again be STOPPED... increasing fio2
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lower fio2 = higher total flow
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lower total flow = higher fio2
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