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P&P Fall 2019 > Ex2 Anesthesia Gas Machine > Flashcards

Ex2 Anesthesia Gas Machine Flashcards

1
Q

Most fragile part of anesthesia gas machine

A

Flowtubes

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2
Q

What are flowtubes susceptible to?

A

Breakage, leakage, inaccuracy d/t dirt, static electricity

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3
Q

Flowmeters - Shape

A

Variable orifice flowmeter
Tapered - narrow at bottom; wide at top
Annular opening around float is larger at higher flows

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4
Q

Why is oxygen always added last in path of flow?

A

Chance of producing hypoxic mixture is lessened

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5
Q

Only cylinder safety relief valve that melts at temperature

A

Fusible plug made of Woods metal

Melts at temperature 157-220 F

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6
Q

Most fragile part of cylinder

A

Cylinder valve

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7
Q

Only monitor to accurately detect hypoxic mixture

A

O2 analyzer

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8
Q

O2 Flush valve

A

Average delivery 50L/min

35-75 L/min

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9
Q

Fail safe is based on

A

Pressure (Oxygen)

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10
Q

Fail-safe Datex-Ohmeda

A

Pressure sensor shutoff valve

Flow of all other gases shut off when O2 supply pressure < 20 psi

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11
Q

Drager - Fail safe

A

Oxygen failure protection device (OFPD)
Reduces supply of other gases proportionally as O2 supply pressure decreases. Shuts off all flow of N2O/air when O2 pressure < 12psi

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12
Q

Second stage regulators are which machine

A

Datex-Ohmeda

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13
Q

Rod and diagram proportioning system

A

Drager - oxygen ratio monitor controller

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14
Q

Drager maintains

A

25% O2

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15
Q

Proportioning systems are based on

A

FLOW (not pressure)

  • which also means concentration
  • 25%
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16
Q

Second stage regulators trigger

A

O2 14 psi

N2O 26 psi

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17
Q

Most dangerous situation regarding hypoxic guard system

A

Inert gas administration (3rd gas such as Helium) should detect with O2 analyzer
-able to bypass hypoxic guard system w/ Drager

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18
Q

Location of proportioning devices

A

*ratiometers
Between the O2 and N2O flowmeters
*between fail safe/flowmeters

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19
Q

Fail safe devices rely on oxygen

A

Pressure

20
Q

Proportioning devices rely on oxygen

A

Flow

21
Q

Reasons for increased inspired CO2

A
  1. Exhaustion of absorbent granules
    OR
  2. Faulty unidirectional valves
22
Q

Inspiration occurs on ETCO2 waveform

A

EA
AB
DE
NOT just D

23
Q

Components of high pressure system

A

Hanger yoke
Yoke block + check valves
Cylinder pressure gauge
Cylinder pressure regulators (ENDS here)

24
Q

Intermediate pressure system

A

Exposed to pipeline pressure

50 psi

25
Q

High pressure system

A

Exposed to cylinder pressure

26
Q

Components of intermediate pressure

A 
Pipeline inlets, check valves, pressure gauges
O2 pressure-failure devices
Flush valve
O2 second stage regulator (if present)
Flowmeter valve *ENDS here
27
Q

Dividing point between intermediate - low pressure systems

A

Flowmeter valve

*intermediate system

28
Q

Low pressure system

A

Distal to flowmeter valves

29
Q

Low pressure system components

A 
Ventilator power inlet 
Flowmeter tubes
Vaporizers
Check valves (if present)
Common fresh gas outlet** ENDS here
30
Q

How to check low pressure system

A

Attach bulb syringe to common gas outlet

31
Q

Safety relief valves dependent on cylinder pressure

A

Frangible disk

Spring-loaded

32
Q

Plum Bob

A

Read at the top of float

33
Q

Rotating ball

A

Read in the center of float

34
Q

Drager has what type of indicator float?

A

Rotating ball

35
Q

Dates-Ohmeda has what type of indicator float?

A

Plumb bob

36
Q

Hypoxic guard is also known as

A

Proportioning systems

37
Q

Purpose of proportioning systems

A

Link O2/N20 so that final breathing mix = 25%+/-4% O2

38
Q

Dated Ohmeda hypoxic guard

A

Link 25 system (chain/teeth)

39
Q

Bellows should be looked at during

A

Expiration

Ascending — better detects loss of pressure

40
Q

T/F safe to keep cylinder upright without support

A

False

41
Q

T/F may leave empty cylinder on machine

A

F

42
Q

T/F maintain plastic cover on port while installing cylinder

A

False - do not leave plastic on

43
Q

T/F cylinders are color coded for sole identification

A

False - they are color coded but ALWAYS read label

44
Q

T/F oiling valves will maintain use

A

False. - do not oil valves

45
Q

T/F once cylinder is removed, do not place yoke plug

A

False - yoke plug ALWAYS needs to be placed - backup for check valve

P&P Fall 2019 (17 decks)

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