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2025 Anesthesia > Exam 1: Lecture 3: Anesthesia Machine > Flashcards

Exam 1: Lecture 3: Anesthesia Machine Flashcards

1
Q

What is letter A

A

Oxygen cylinder

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2
Q

What is letter B

A

Cylinder Valve

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3
Q

What is letter C

A

Cylinder Pressure gauge

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4
Q

What is letter D

A

Regulator (or reduction valve)

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5
Q

What does letters A,B,C,D make up on the machine?

A

High pressure system

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6
Q

What is letter G

A

Oxygen flush / bypass valve

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7
Q

What system is made up by letter G on the machine

A

Intermediate pressure system

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8
Q

What is letter E

A

Flow meter

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9
Q

What is letter F

A

Vaporizer

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10
Q

What is letter H

A

Common gas outlet

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11
Q

What is letter I

A

common gas inlet

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12
Q

What is letter J

A

one way valves
- inspiratory
- expiratory

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13
Q

What is letter K

A

pop-off valve

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14
Q

What letters do E, F, H, I, J , and K make up on the machine

A

Low pressure system

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15
Q

What type of oxygen source is defined?

  • E, G and H cylinder
  • Usually 2 banks are connected to a common manifold that converts them into one continuous supply
A

Compressed gas in cylinders

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16
Q

What type of oxygen source is defined?

  • Large liquid oxygen container installed at facilities that have fairly constant demand
A

Cryogenic liquid source

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17
Q

What type of oxygen source is defined?

  • When oxygen is needed the O2 is drawn as required and passed through the heater to increase temperature and raise the pressure
A

Cryogenic liquid supply

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18
Q

What type of machine increases O2 concentration by absorbing nitrogen onto a molecular sieve and allows O2 and trace gasses to pass through = resulting in an O2 concentration of 90-96%

A

Oxygen concentrator

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19
Q

What type of oxygen source is this?
- compact, lightweight, reliable units and easy to transport
- can save money
- Maintenance required
- takes a few min to reach 96% concentration
- produces gas flow that would be acceptable for small animal anesthesia patients

A

Oxygen concentrator

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20
Q

What part of the oxygen cylinder is labeled by the arrow on the top left corner?

A

neck

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21
Q

What part of the oxygen cylinder is labeled by the arrow on the top right corner?

A

tapered screw threads, attached to valve

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22
Q

What part of the oxygen cylinder is labeled at the bottom?

A

base

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23
Q

What type of oxygen source can be made of steel, steel carbon fibers or aluminum
- filled and discharged through a value, the port is the point of exit
(protect port during transport, use seal washer(gasket) over nipple prior to attaching cylinder to yoke)
- handle or cylinder wrench used to open / close the cylinder valve

A

Oxygen cylinder

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24
Q

What consequence could occur on a oxygen cylinder if you open the valve quickly (rapid compression of gas generates heat) = adiabatic process + dust, grease, etc.

A

flash fire or explosion
- Always open the valve slowly to avoid these

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25
Q

In a Oxygen Cylinder labeled E, what is the capacity for storage?

A

660

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26
Q

In a Oxygen Cylinder labeled E, what is the pressure for storage?

A

2200

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27
Q

In a Oxygen Cylinder labeled H, what is the capacity for storage?

A

6900

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28
Q

In a Oxygen Cylinder labeled H, what is the pressure for storage?

A

2200

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29
Q

When should oxygen cylinder be inspected or tested

A

every 5 years

  • safety mechanisms to prevent connection of wrong gas
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30
Q

What color are oxygen tanks in the US?

A

Green

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31
Q

What color are oxygen tanks outside of the US?

A

white

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32
Q

What color is N2O gas tanks?

A

blue

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33
Q

What is this?

A

Pin Index Safety System (PISS)

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34
Q

What is this?

A

Diameter Index Safety System (DISS)

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35
Q

What is this?

A

Manufacturer-specific quick connector

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36
Q

What is labeled by the red arrow?

A

regulator

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37
Q

What is labeled by the green arrow?

A

cylinder pressure gauge

38
Q

What is the role of the regulator on an anesthesia machine?

A
  • reduces the gas pressure from the cylinder (or other sources) to a usable level of a constant 50 psi
  • specific for gas and tank size (E or H)
  • terminates in a gas specific male DISS fitting
39
Q

What is the role of the Cylinder pressure gauge on an anesthesia machine?

A
  • Must be installed downstream of each pressure regulator
  • Calibrated in psi
  • allows user to calculate remaining liters in tank or pipeline pressure
40
Q

At what PSI should you replace the oxygen cylinder?

A

less than 500 PSI

41
Q

How many liters of oxygen are left in this E tank?

42
Q

How many L are left in the following cylinder

A

2200 PSI / 660 PSI = 1500 PSI / XL
= 2200 X = 1500 (660)
= X = 990,000 / 2200
= X = 450 L

43
Q

What part of the oxygen machine receives O2 from the pipeline inlet or cylinder pressure regulator and directs a high unmetered flow directly to the common gas outlet?

A

35 to 75 L/min activated = possible barotrauma, so NEVER use when connected to a non-rebreathing system

44
Q

T/F: It is ok to open the oxygen flush valve when the patient is hooked up as long as the tank is being exchanged

A

FALSE!!!

never open the flush valve when the patient is hooked up

45
Q

What is this?

A

Oxygen flush valve

46
Q

What is this?

A

Flow meter

47
Q

What part of the oxygen machine
- indicates rate of flow of gas passing through them
- turn control knob counterclockwise to increase flow and clockwise to decrease flow

A

Flow meter

48
Q

What direction do you turn the control knob on a flow meter to decrease output?

49
Q

What direction do you turn the control knob on a flow meter to increase output?

A

Counter clockwise

50
Q

What should the flow meter be set to for reliable output?

A

500 - 2000 mL/min

51
Q

Dont set the flow meter lower than _______ with a rebreathing system

52
Q

What is the variable orifice flow indicator

A

tube is internally tapered (smallest diameter at bottom), so hight increases = more gas flow

53
Q

How many L/min of oxygen is being delivered with this flow meter setting?

54
Q

Where is the only place unidirectional valves are located and what is the purpose of these valves?

A

Only present on a rebreathing system - allows gases to only travel in one direction
- inspiratory valve
- expiratory valve

55
Q

What are the disadvatages of unidirectional valves

A

increase resistance to breathing
- if one of both valves are leaky the patient will rebreathe CO2

56
Q

What device changes a liquid anesthetic agent into its vapor and adds a controlled amount of that vapor to the fresh gas flow going into the patient breathing system

57
Q

Modern vaporizers share what following designs?

A

gas specific
concentration calibrated
variable bypass
flow over vaporization method
temperature controlled

58
Q

What is this?

A

Unidirectional valves

59
Q

What is this?

60
Q

Where are concentration calibrated vaporizers located on the oxygen machine?

A

Between the flowmeter and common gas outlet

61
Q

How is vaporizer output controlled

A

dial / knob that is calibrated in volumes percent

62
Q

how does the vaporizer dilutes the saturated vapor pressure by splitting the gas flow?

A
  • bypass to the vaporizer outlet
  • vaporizing chamber
63
Q

What is this?

64
Q

What will prevent the two vaporizers on machine turning on at the same time

A

interlock systems

65
Q

If the vaporizer is tipped it should be flushed with high ______, flow rate for the max time recommended by manufacture

66
Q

Ideally, vaporizer should be emptied prior to transport, left in upright position, and dial is set to what position

67
Q

What color is a bottle of isoflurane anesthetic

68
Q

What color is sevoflurane anesthetic

69
Q

What part of the machine receives all gasses and vapors from the machine and delivers the mixture to the breathing system

A

common / fresh gas inlet and outlet

70
Q

What is this?

A

Common / fresh gas inlet

71
Q

What is the reservoir bag used for in surgery

A

used to monitor the frequency of respiratory rate and compliance of patient’s pulmonary system during assisted ventilation

72
Q

What size reservior bag would you select for a 35 lb dog

A

B

35 lb =15.9 kg
16 kg x 10 mL/kg X 5
800 mL = 0.8 L

73
Q

What part of the anesthesia machine is used to control the pressure in a breathing system
- transiently close APL to deliver manual ventilation to patient
- Otherwise must be kept open at all times

A

Adjustable pressure limiting (pop-off) valve

74
Q

What must you remember about an adjustable pressure limiting (pop-off) valve

A

must be kept open at all times

75
Q

What is this?

A

Adjustable pressure limiting (pop-off) valve

76
Q

What are the top 3 killers for anesthesia machine

A

closed pop-off valve
too little O2
too high vaporizer setting

77
Q

What are some common safety concerns of a anesthesia machine

A

improper cylinder storage
tipping over vaporizer
wrong inhalent in vaporizer
overfilling vaporizer
O2 and N2O are flammable

78
Q

Describe proper cylinder storage

A
  • never in contact with the oils, grease, organic lubercants and rubber
  • valve kept close to prevent bleeding
  • store away from a heating duct
  • never drag, drop, slide or roll
79
Q

What are the 7 steps to machine pressure check

A
  • O2 on flow meter is off
  • Close pop off valve
  • Occlude the patient end of the Y piece
  • Press the O2 flush
  • Observe pressure gauge for 30 seconds
  • Release the APL valve
  • Remove occlusion from Y piece
80
Q

What is labeled by the orange arrow?

A

Cylinder valve

81
Q

What is labeled by the blue arrow?

A

Pressure gauge

82
Q

What is labeled by the yellow arrow?

83
Q

What is labeled by the blue arrow?

A

cylinder label

84
Q

What is labeled by the red arrow?

A

hanger yoke: orients and supports cylinder, provides gas fighting seal

85
Q

What is labeled by the blue arrow?

A

Reservoir bag or ventilator hose goes here

86
Q

What is labeled by the blue arrow?

87
Q

What is labeled by the red arrow?

A

index pins

88
Q

What is labeled by the orange arrow?

A

retaining screw

89
Q

What is labeled by the orange arrow?

90
Q

What is labeled by the red arrow?

A

PISS holes

91
Q

What is labeled by the yellow arrow?

A

Conical depression to receive yoke retaining screw

2025 Anesthesia (23 decks)

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