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Principles Exam 3 > Gas Machine > Flashcards

Gas Machine Flashcards

1
Q

The Anesthesia Machine Definition:

A

A device which delivers a precisely-known but variable gas mixture, including anesthetizing and life-sustaining gases.

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2
Q

What’s the difference between an Anesthesia gas machine & an ICU ventilator?

A 
1.Manipulation of  mix of gases
    •Washin/out N2, O2, N2O, agents
    •Humidification
    •Rebreathing and CO2 removal
2.Monitoring of gas composition (because of #1)
3.Manipulation of fresh gas flow
   •“low flow” anesthesia
4.Adaptability
   •smallest neonate to largest adult
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3
Q

What is the gas machine ASTM standard?

A

American Society for Testing and Materials F1850 workstation standard- determines what should be on every anesthesia workstation

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4
Q

Normal working pressure of gas machine?

A

50 psi

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5
Q

What is the O2 flush flow in L/min?

A

35-75L/min (huge)

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6
Q

What is the National Institute for Occupational Safety and Health (NIOSH) standard for Wast Anesthesia Gases (WAGs)?

A
  • 2 ppm halogenated agents (0.5 ppm with nitrous oxide)

- 25 ppm nitrous oxide

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7
Q

What are the tube sizes for scavenger system hoses?

A

19 or 30 mm

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8
Q

What are the tube sizes for the breathing circuit?

A

22 mm

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9
Q

What are the tube sizes for ETT or CGO (common gas outlet)?

A

15mm

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10
Q

What are the five tasks of O2 in the gas machine?

A
  1. ventilator
  2. flush valve
  3. oxygen pressure failure alarm
  4. “fail safe” (pressure sensor shutoff valve)
  5. flowmeters
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11
Q

What components are part of the high pressure system?

A
  1. Hanger Yoke
  2. Yoke block with check valve
  3. Cylinder pressure gauge
  4. Cylinder pressure regulators
    N&P pg. 244
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12
Q

What parts of the gas machine are part of the low pressure system?

A
  1. Flowmeter tubes
  2. Vaporizers
  3. Check valves (if present)
  4. Common Gas outlet

N&P pg. 244

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13
Q

What is the ultimate destination of gases?

A

The scavenging system

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14
Q

What is the pipeline gas source?

A

It is liquid O2 converted to gas and supplied to hospital pipelines at 50 psi

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15
Q

What is the DISS?

A

Diameter index safety system- prevents cross connection of gases by designating different size connections for each gas

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16
Q

What is present at the pipeline inlet?

A
  1. Filter
  2. Check valve
  3. pressure gauge
17
Q

What does the check valve do?

A

ensures unidirectional forward flow so that a machine running on cylinder supplies with the hose disconnected a the wall outlet does not leak

18
Q

What are some pipeline source hazards?

A
  1. Unexpected contents- bacteria, viral, particulate
  2. Inadequate or (excessive) pressure
  3. Unexpected contents
19
Q

What would alert you to inadequate pressure?

A
  • Flowmeters drop, bellows drop, low pressure alarms

- To correct: disconnect hose from wall and open O2 cylinder fully, Don’t use mechanical vent and bag manually

20
Q

What might indicate unexpected crossover of gases?

A
  • Decreasing FiO2 in spite of unchanged O2 flow

- Disconnect hose from wall and open cylinder fully

21
Q

When should cylinders be opened?

A

Only when being checked or pipeline supply is not available

22
Q

What is the PISS?

A

Pin index safety system- the holes mate with pins in the yoke which point to where the cylinders are attached. It is a means of preventing misconnections

23
Q

How can the PISS be defeated?

A

if pins are missing, removed, or if more than one washer is used

24
Q

What is the hanger yokes function?

A
  1. orients cylinders
  2. provided unidirectional flow
  3. ensures gastight seal
25
Q

What size are the O2 cylinders on the back of the gas machine?

A

Size E

26
Q

What are check valve (or unidirectional valves) within the hanger yoke functions?

A
  1. Minimize transfilling and leaks to atmosphere

2. allows cylinder to be changed during case

27
Q

What is the job of the cylinder pressure regulator?

A

Converts the high variable pressure in the tank (up to 2000psi) to constant pressure of 45 psi downstream from regulator

28
Q

Who regulates cylinder transport and storage?

A

DOT (US dept. of Transportation)

Principles Exam 3 (3 decks)

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