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Principles of Anesthesia 1 (Summer 2023) > Exam 3 (Anesthesia Machines) > Flashcards

Exam 3 (Anesthesia Machines) Flashcards

1
Q

What still works if master switch is off?

A
  • Battery charger,
  • electrical outlets
  • O2 flush valve
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2
Q

What is the biggest power draw in an anesthesia machine?

A

machine ventilation

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3
Q

What are the electrical outlets on the anesthesia machine intended for?

A

Anesthesia monitors

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4
Q

What all is part of the high pressure system?

A
  • (H)anger yoke
  • (C)ylinders
  • (C)heck valve assembly
  • (C)ylinder pressure indicators
  • (P)ressure regulators
  • Hail CCCP
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5
Q

What is the purpose of the high pressure system?

A

Reduce gas from cylinders to lower, more constant pressures suitable for the anesthesia machine

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6
Q

What are the functions of the hanger yoke?

A
  • Orient & support cylinder
  • Provide gas-tight seal
  • Ensure unidirectional flow
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7
Q

What are the parts (6) of the hanger yoke?

A
  • Body
  • Check valve assembly: Ensures unidirectional flow
  • Index pins
  • Nipple: thru which gas enters machine
  • Retaining screw: tightens cylinder
  • Washer: forms seal between cylinder & yoke
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8
Q

What are the purposes of the hanger yoke check valve assembly?

A
  • Ensures unidirectional flow
  • Prevents gas from exiting machine when no cylinder is in the yoke
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9
Q

Cylinder pressure gauges are required to be calibrated in what units?

A

kilopascals (kPa)

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10
Q

Increasing pressure on a Bourdon tube increases or decreases the curve?

A

decreases or straightens

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11
Q

What is the purpose of pressure regulators?
How many are there supposed to be?

A
  • Reduce high variable pressure in cylinders to lower constant pressure for machines.
  • One regulator for each gas supplied by a cylinder
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12
Q

What is part of the Intermediate pressure sytem?

A
  • (P)neumatic part of master switch
  • (O)xygen pressure failure devices
  • (O)xygen flush valve
  • (P)ipeline inlet connections & indicators
  • (P)iping
  • (F)low control valves
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13
Q

What is the pressure reading with the master switch turned off?

A

Zero

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14
Q

What are the pipeline & cylinder pressures in the intermediate pressure system?

A
  • Pipeline: 50-55 psi
  • Cylinder: 45 psi
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15
Q

What part of the intermediate pressure system relates to the DISS?

A

The pipeline inlet connections

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16
Q

Pipeline inlet connections must have what?

A

Unidirectional check valves to prevent gas returning to pipeline

17
Q

Where are the pipeline pressure indicators located?
How many are there?

A
  • Front of the anesthesia machine
  • At least 1 for each gas
18
Q

What pressure does the intermediate pressure system piping have to withstand?
What about leaks?

A
  • Must withstand 4x intended pressure. Around 200-220 psi
  • Leaks must not exceed 25 mL/min
19
Q

What is happening if you hear an alarm about every 5 seconds?

A

The oxygen pressure is reduced to 30 psi

20
Q

What is the purpose of the O2 failure safety device?

A
  • Decreases or discontinues N₂O when in use
  • Maintains 19% O₂ concentration at common gas outlet
  • Continues until O₂ flow ceases
21
Q

What is the flow when the O2 flush button is pressed?

A

35-75 L/min

22
Q

Where does the O₂ flush button send oxygen?

A

To the common gas outlet

23
Q

The oxygen flush must be what?

A
  • Operable with 1 hand
  • Single purpose
  • self-closing
  • designed to minimize accidental use
  • have flow between 35-75 L/min
24
Q

What are the hazards of the oxygen flush?

A
  • May cause barotrauma
  • May cause awareness d/t backwash
25
Q

Flow adjustment controls must be?

A
  • Only control one gas for each control knob/button
  • Must be adjacent to its flowmeter
  • O₂ flow knob must be larger & fluted compared to others
26
Q

What are the parts of the low pressure system?

A
  • common gas outlet
  • Flowmeters
  • Hypoxia prevention devices
  • Pressure relief devices
  • Unidirectional valves
27
Q

The low pressure system starts where?

A

Downstream of flow control devices (Flowmeters)

28
Q

What design do flowmeters have?

A

Thorpe tube design

29
Q

Flowmeters empty into what?

A

Common manifold

30
Q

What is the correct flowmeter sequence?

A
  • Left: N₂O or Air
  • Middle: Air or N₂O
  • Right: ALWAYS O₂
31
Q

What is the hypoxia prevention device?
When is it activated?

A
  • A constant minimum O₂ flow of 50-250 mL/min thru the machine
  • Activated when master switch is turned on
32
Q

What is the minimum O₂ ratio?

A
  • It uses a mechanical linkage between O₂ & N₂O to keep O₂ concentration at at least 25% when N₂O is turned up
33
Q

Where are the low pressure system unidirectional valves located?

A
  • Between vaporizer & common gas outlet
  • Upstream from O₂ flush valve
34
Q

Where are pressure relief devices located?
How do they work?

A
  • Near common gas outlet
  • Open to atmosphere if preset pressure is exceeded
35
Q

What is a downside to pressure relief devices?

A

Limits the ability of the machine to provide adequate pressure for Jet ventilation

36
Q

The common gas outlet must be?

A

Difficult to disconnect

37
Q

What should the common gas outlet not be used for?
Why?

A
  • Supplemental O₂
  • As it may deliver volatile anesthetics
38
Q

What is the alternative O₂ control used for?
Why should one be careful with it?

A
  • Delivers O₂ in case of loss of electricity
  • If turned on it will turn off power to rest of the anesthesia machine

Principles of Anesthesia 1 (Summer 2023) (14 decks)

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