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17 Cards in this Set
- Front
- Back
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On the AGM, how is the valve on the DISS/Hangar Yolk system works?
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It is free floating – moves by gas pushing it and prevents gas from leaking out.
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On the AGM, how does the ball & spring valve works?
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Permits gas flow by adjoining two pieces - a male to a female connection
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The ____________ valves are seen on the 1st & 2nd regulators of the AGM.What are their purpose?
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Diaphragm
They reduce pressure. |
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How does the high, intermediate & low pressure parts of the circuit differ?
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They consists of parts that receive gas pressure at:
High - 2200 psi (oxygen cylinders); Intermediate: constant pressures of 37-55 psi, which is pipeline pressure; Low: areas distal to the second flowmeter |
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What is the purpose of the hanger yoke
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1. Orients cylinders
2. Provides unidirectional flow 3. Ensures gas-tight seal. In the cylinder yoke functions to: 1. Minimize trans-filling, 2. Allow change of cylinders during use 3. Minimize leaks to atmosphere if a yoke is empty |
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the fail-safe systems prevent hypoxic mixtures
True or false? |
False
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At what rate and pressure does the oxygen flush valve deliver oxygen to the pt?
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Rate - 35-75L/m
Pressure 40-50psi |
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On the AGM, what is the purpose of the check valve & where is it found?
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Reduce back flow - promotes unidirectional flow.
Found on both wall and cylinder gas flow. |
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Flowmeters (aka Thorpe tube) are ________ pressure, _______ orifaces & low pressure of _______ devices.
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Constant
Variable 16psi |
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From the flowmeter, in what direction does oxygen enters the common manifold?
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O2 always enters the common manifold “down stream” or proximal to pt.
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List the 7 components of circle system?
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Fresh Gas Flow
I/E unidirectional valve I/E tubing Y – connector Pop off (manages overflow) Reservoir bag CO2 absorbent |
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How much resistance can be attributed to the circle system?
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Less than 3 cm H2O (less than the resistance imposed by the endotracheal tube).
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ETT results in _________ L
dead space while the mask results in _______ a. 0.46 b. 0.65 Both causes > dead space than normal which is _____ L |
0.46
0.65 0.33 Mask 0.65 L |
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Where does mechanical dead space ends?
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At the point where inspired and expired gas streams diverge (the Y-connector).
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Advantages/disadvantages of the circle system?
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Advantages:
Constant inspired concentrations conserve resp heat & humidity Useful for all ages (may use down to 10 kg, about one year of age, or less with a pediatric disposable circuit) Useful for closed system or low-flow Low resistance (less than tracheal tube, but more than a NRB circuit) Disadvantages: Increased dead space, Malfunctions of unidirectional valves (usually d/t condensation). |
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If you are using bara lime CO2 absorber, what should know about its use in relationship to Sevoflurane?
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Problems:
Sevoflurane is unstable in soda lime, producing Compound A Sevoflurane is not recommended at total fresh gas flows less than 1 L/min for more than 2 MAC-Hours |
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How does the pt reflects signs of CO2 absorbant exhaustion
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Rise (later a fall) in HR & BP
Hyperpnea Respiratory acidosis Dysrhythmia Signs of SNS activation Flushed Cardiac irregularities Sweating Increased bleeding at surgical site Increased ETCO2 |
