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Priniclpes Of Anesthesia > Gas machine PPT > Flashcards

Gas machine PPT Flashcards

(63 cards)

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1
Q

Gas machines have a system to provide and measure (3):

A
  1. Oxygen
  2. Anesthetic agents
  3. CO2
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2
Q

SPDD (gas machine organization)

A

Supply
Processing
Delivery
Disposal

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3
Q

Supply for gas machine (2) - how do gasses get into the machine?

A

Pipeline and cylinders

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4
Q

O2 hospital pipeline liquid oxygen is converted to gas pressure of

A

50 psi

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5
Q

DISS stands for (and fucntion)

A

Diameter Index Safety alarm

non-interchangable, threaded fittings to connect gas powered devices to station outlets

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6
Q

cylinders on back of machine should be kept closed so that

A

alarm will sound with a loss of pressure

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7
Q

What is the most frequently missed item in preanesthesia setup

A

amubag

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8
Q

Cylinder valve

A

Most fragile part of cylinder

has a unique arrangement of holes that correspond with contents

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9
Q

Pipeline psi

A

50 psi

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10
Q

Oxygen cylinder is supplied at (psi)

A

1900-2200 PSI

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11
Q

Oxygen in cylinder is regulated to ____ PSI after it enters the machine

A

45 psi

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12
Q

NIOSH recommendation fo occupational exposure to nitrous

A

<2ppm halogenated agents (0.5 ppm if using N2O)

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13
Q

NIOSH reccomendation for occupation exposure to N2O alone

A

<25 ppm

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14
Q

What prevents one cylinder from emptying into the other

A

Free floating valve

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15
Q

E cylinder with highest pressure

A

closes valve on the cylinder with less pressure

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16
Q

Check valve in cylinder yoke (3):

A
  1. Minimizes trans-filling
  2. allows change of cylinders during use
  3. Minimizes leaks to atm if yoke is empty
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17
Q

Regulator in cylinder

A

supplies constant downstream pressure (45 psi) so that if cylinder is left open, gas will still flow

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18
Q

O2 service pressure

A

1900 psi

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19
Q

N2O service pressure

A

745-750

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20
Q

Air service pressure

A

1900

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21
Q

O2 capacity

A

660L

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22
Q

N2O capacity

A

1600 L

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23
Q

Air capacity

A

635 L

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24
Q

The five tasks of oxygen:

A
  1. Flows to the fresh gas flowmeter
  2. Powers the oxygen flush
  3. activates fail safe mechanics
  4. Activates oxygen low pressure alarm
  5. Compresses the bellows of mechanical ventilators
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25
Flowmeters are located downstream from all safety devices and alarms EXCEPT:
the oxygen analyzer
26
When should you flush to fill bellows?
during EXPIRATION
27
Oxygen flush valve
Bypasses vaporizers and can dilute anesthetic
28
Gate of gas outlet is held open by
pressure in the oxygen line (oxygen must be present for gate to remain open) Gate closes if oxygen pressure is not met
29
Piston ventilators may operate for prolonged periods with only cylinder supplies because:
They do not consume oxygen to drive the bellows
30
A ventilator not driven on pistons and driven on oxygen can consume a whole E cylinder in:
30 minutes
31
Final breathing mixtures at the common gas outlet are
at least 23% to 25% oxygen
32
How can oxygen proportioning fail (4)?
1. wrong supply of gas in oxygen pipeline or cylinder 2. Defective pneumatics or mechanics 3. Leaks downstream of flow control valves 4. innert gas administration (third gas such as helium)
33
Low pressure alarm and hypoxic guard systems are based on
the pressure within the oxygen circuitry of the gas machine
34
______ determines that oxygen is present
Inspired Oxygen Analysis *ONLY ONE SYSTEM that does this
35
Inspired oxygen analysis check
MUST check function before ANY anesthesia care, including MAC cases in case of needing to convert to GA
36
What is used to contain liquid in the vaporizers and why
copper, because it has high thermal conductivity and capacity
37
The rate of vaporization depends on:
1. temperature 2. vapor pressure of the liquid 3. partial pressure of the vapor above the evaporating liquid
38
vapor prsesure
equilibrium between molecules leaving liquid phase into gaseous phase and molecules leaving gaseous phase and entering liquid phase
39
Latent heat of vaporization
heat required to change one mol of liquid into gas
40
Specific heat
heat required to raise the temp of 1g of substance by 1 degree celcius
41
Thermal conductivity
ability of a given material to conduct/transfer heat
42
Ambient pressure effect*
43
Boyle's law
If volume increases, pressure decreases and vice versa
44
Tec 6 vaporizers are designed specifically for_____and are ______ heated
desflurane, electrically heated
45
Tec 6 vaporiers are pressurized to____.
2 atmospheres
46
Desflurane must be heated to
maintain a constant temp and vapor pressure. It has a vapor pressure 3-4 times that of other gasses and boils at room temp, need to prevent "boiling out" at room temp
47
Altitude and desflurane vaporizer output
Higher altitude = lower barometric pressure You would need to increase dial at higher pressure to obtain same effect at lower altitude
48
During the ____ stage, low fresh gas flows are good
maintenance
49
increasing the flows on induction will _______ the speed of equilibrium
increase
50
After induction, too low of flows could cause
awareness
51
The low pressure leak test evaluates:
the integrity of the anesthesia machine from the flow control valves to the common gas oullet
52
Evaluation of the circle system and APL valve: (where does it evaluate)
evaluates from common gas outlet to patient
53
Circle system and APL valve evaluates: (what does it evaluate)
1. Leak in circuit 2.proper inspiratory and expiratory flow
54
Gas enters the system from ______ and exits ______
enters from CGO by way of fresh gas delivery hose, and exits the circle to the scavenger via the APL valve
55
APL valve aka
adjustable pressure-limiting valve
56
APL valve function (4):
-provide dialed-in amount of pressure to patient -PEEP -manual ventilation -assisted respiration
57
What determines breathing circuit resistance(2)?
circuit diameter and length
58
What machine alarms are based on circuit pressure?
1. disconnection alarm 2. high pressure alarm
59
Most common critical incidents occur from
disconnection at the Y piece
60
Boyle's law
Volume of gas and pressure of gas are inversely related
61
What can reliably detect a disconnection in the breathing circuit (2)?
1. ETCO2 2. Respirometer
62
What is the most important part of the scavenging system
the scavenging interface
63

Priniclpes Of Anesthesia (19 decks)

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