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Anestesia Values/Machine CVM
Anestesia Values/Machine
61
Veterinary Medicine
Graduate
04/18/2013

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Cards

Term
3 types of gas supply
Definition
1. Compressed
2. Liquid
3. O2 generators
Term
Formula for how many liters of 02 are in a compressed O2 cylinder
Definition
PSI of tank * 0.3 = L
Term
How to calculated FLOW RATE of an O2 cylinder
Definition
PSI of tank * 0.3 = L

Then take your L/60 = L/min
Term
How many turns to open the tank
Definition
2 full turns
Term
Oxygen line pressure needed
Definition
50 psi
Term
What the Yolk and Pin Index system do
Definition
Make sure you are putting the right tank on
Term
Describe the path of an O2 molecule from tank to flow meter
Definition
tank --> Pressure reduction valve (PSI) --> Line/tube (50PSI) --> Flow Meter (L/min)
Term
What do we use the flow meter for?
Definition
Read ml/min or L/min going to the vaporizer
Read middle of ball or top of bobbin
Term
What rate should we set the flow meter at?
Definition
02 flow should ≥ Metabolic need
Term
Oxygen Flush Valve function
Definition
Allows 02 to by-pass the flow meters and vaporizer
ie: Pure O2 into a breathing system
Term
What is the O2 flush flow rate?
Definition
35-75L/min .... so about 50 L/min (HIGH flow rate)
Term
What is Oxygen + Vaporized Anesthetic?
Definition
Fresh Gas
Term
What is the fresh gas line connected to?
Definition
Fresh Gas --> Attaches at fresh gas inlet to a breating Circuit
Term
2 types of breating circuits
Definition
Rebreating
Non-Rebreating
Term
Bain Circuit type
Definition
NON-Rebreating
Term
Rebreating Circular System
Definition
Unidirectional Valves (Flutter Valves) keep O2 flowing in the
Term
Problem with circular systems
Definition
moisture can cause valves to stick
Term
Size of reservoir bag
Definition
6 * tidal volume

(tidal volume = 5-7 ml/lb) ---> just remember 6 * (6ml/lb)
Term
Why we use a reservoir bag
Definition
monitor breathing
Allows you to give them a breath
Term
What weight do you use an adult breathing circuit
Definition
> 20 lbs
Term
What weight do you use a pediatric breathing circuit
Definition
<20lbs
Term
Where does dead space begin in breathing circuit?
Definition
At "Y"
Term
Pressure manometer (pressure Gauge) purpose
Definition
Measures the pressure w/in the Breathing circuit
Used to determine how big of tidal volume to deliver to patient
Measured in cm H2O
Term
What is the pressure manometer units
Definition
cm H20

PSI --> L/Min --> cm H20
Term
Do you have to close the pop-off valve to give a breath?
Definition
YES! 20mmH20 breath
Term
How do you know the CO2 absorber is working
Definition
Its warm
Granules are soft
Granules are blue (blue when CO2 present)
Term
What is it size of the CO2 absorber
Definition
2 * tidal Volume
Term
When to change soda lime
Definition
When granules are hard
After 1/2 color changed
If Channeled
Not warm!
Term
Why does channeling happen?
Definition
MOISTURE causes clumping on sides
or
Too full canister can't expand
Will be all blue in middle but the outsides will be white

Bad b/c rebreathing CO2
Term
What is the pop off valve purpose
Definition
relieve pressure in the circuit
Allow waste gases to go to scavenge
prevents barotrauma
Term
What is the 02 rate in a CLOSED system
Definition
O2 rate = Metabolic rate! (2-3 ml/lb/min)
Can have pop-off valve closed/ no scavenge since you are at metabolic rate and rebreathing the O2
Term
Metabolic rate of Oxygen
Definition
2-3 ml/lb/min
Term
In a semi-closed system what is the rate of O2
Definition
> metabolic rate of O2

NEED to have scavenge for extra CO2
Term
Where is the negative pressure release valve
Definition
on top of the inhale valve
Term
What is the purpose of the negative pressure release valve
Definition
will let in room air is there is negative pressure when the animal breaths (ran out of O2)
Term
If the system has no valves what is it?
Definition
non-rebreathing
Term
What is a Universal F- Circuit
Definition
rebreathing circuit that aids in warming and humidification
there is an increased resistance to breathing --> use in patients > 20 lbs

Has identical funct to conventional circuit
Term
Closed vs. Semi-closed Circular systems - What is the difference determined by?
Definition
O2 Flow Rate!

Closed = metabolic rate
Semi-closed = > metabolic rate
Term
What does the term "Closed" indicate?
Definition
That some/all of the exhaled gases are rebreathed - Not that the pop-off valve is closed.
Term
Advantages of a closed circle system
Definition
Save $$
Less Pollution
Conserves heat and humidity
dont have to continually open and close pop-off to give breath
Term
Disadvantages of a closed circle system
Definition
Hypoxia - watch res bag to determine if giving enough O2
Takes LONGER to change anesthetic [ ] in circuit
Term
Semi closed circle circuit advantages
Definition
can quickly change rates if anesthetic [ ]
Term
What is "Low-Flow" anesthesia?
Definition
When the O2 flow rate is CLOSE to metabolic rate in a semi-closed system
Term
Problem with Circular Systems in general
Definition
SLOW change rates if anesthetic [ ] w/ closed and low-flow
Cant use on very small patients
Term
How to test the Circuit w/ a circle system
Definition
Close pop-off valve --> occlue Y-peice w/ thumb --> push the O2 Flush until you have 20 cm H2O

If the Manometer falls in pressure indicates a leak!!!!
Term
Circle System = what kind of circuit
Definition
Rebreathing
Term
Bain Circuit is what kind of system
Definition
Non-rebreathing
Used for smaller animals
Term
Describe a Bain Circuit
Definition
A tube inside a tube

The innermost tube carries Fresh Gas in
Outer Tube carriers CO2 out
Term
What size do we use a Bain Circuit for
Definition
Wee little ones - <5lbs pr < 2-3kg
Term
Why do animals not rebreath CO2 w/ a bain circuit
Definition
High O2 rates
Term
What is the O2 flow rate of a Bain Circuit (non-rebreathing)
Definition
100 ml/lb ** KNow! its a HIGH FLOW RATE
Term
Will you have some CO2 rebreating with a bain circuit
Definition
Yes! Even with a flow rate of 100ml/lb

to completely eliminate need flow rate = 3X minute ventilation

Minute Vent = Resp Rate * Tidal Volume

TV = 5-7 ml/lb
Term
Why use Bain System on patients < 5-6 lbs
Definition
Decreased Dead Space
Decreased Resistance to breathing
Term
Disadvantages of Bain Circuit
Definition
Uses more O2 and anesthetic per/lb of patient
Loss of humidity = COld Patient
Loss of Heat = Cold Patient
can NOT use O2 Flush = Barotrauma
Term
Why can you NOT use O2 flush in a bain circ?
Definition
BAROTRAUMA!
Term
Comparison of O2 flow rates in
Rebreathing
Non-Rebreathing Semi-closed
Non-rebreating Semi-open
Definition
Rebreathing = 2-3 ml/lb/min (= met rate)
Non-Rebreathing Semi-closed = > met rate
Non-rebreating Semi-open = 100 ml/lb/min
Term
Comparison of pop-off valves in
Rebreathing
Non-Rebreathing Semi-closed
Non-rebreating Semi-open
Definition
Rebreathing = CLosed
Non-Rebreathing Semi-closed = Open, except when giving breath
Non-rebreating Semi-open = Open, except when giving breath
Term
Peep valve purpose
Definition
Put in backwards --> Will open up @ 20 mg H20?
- Safety mech to prevent pressure build up in circuit
ie: prevent barotrauma
Term
what does the F/Air canister contain?
Definition
Activated Charcoal
Term
Active Scavenge
Definition
Suction of waste material into scavenge
Term
Passive Scavenge
Definition
+ pressure of waste gases pushed gas into scavenge
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