Ex2 Anesthesia Gas Machine

Question 1

Most fragile part of anesthesia gas machine

Answer 1

Flowtubes

Question 2

What are flowtubes susceptible to?

Answer 2

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

Question 3

Flowmeters - Shape

Answer 3

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

Question 4

Why is oxygen always added last in path of flow?

Answer 4

Chance of producing hypoxic mixture is lessened

Question 5

Only cylinder safety relief valve that melts at temperature

Answer 5

Fusible plug made of Woods metal

Melts at temperature 157-220 F

Question 6

Most fragile part of cylinder

Answer 6

Cylinder valve

Question 7

Only monitor to accurately detect hypoxic mixture

Answer 7

O2 analyzer

Question 8

O2 Flush valve

Answer 8

Average delivery 50L/min

35-75 L/min

Question 9

Fail safe is based on

Answer 9

Pressure (Oxygen)

Question 10

Fail-safe Datex-Ohmeda

Answer 10

Pressure sensor shutoff valve

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

Question 11

Drager - Fail safe

Answer 11

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

Question 12

Second stage regulators are which machine

Answer 12

Datex-Ohmeda

Question 13

Rod and diagram proportioning system

Answer 13

Drager - oxygen ratio monitor controller

Question 14

Drager maintains

Answer 14

25% O2

Question 15

Proportioning systems are based on

Answer 15

FLOW (not pressure)

• which also means concentration
• 25%

Question 16

Second stage regulators trigger

Answer 16

O2 14 psi

N2O 26 psi

Question 17

Most dangerous situation regarding hypoxic guard system

Answer 17

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

Question 18

Location of proportioning devices

Answer 18

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

Question 19

Fail safe devices rely on oxygen

Answer 19

Pressure

Question 20

Proportioning devices rely on oxygen

Answer 20

Flow

Question 21

Reasons for increased inspired CO2

Answer 21

1. Exhaustion of absorbent granules
   OR
2. Faulty unidirectional valves

Question 22

Inspiration occurs on ETCO2 waveform

Answer 22

EA
AB
DE
NOT just D

Question 23

Components of high pressure system

Answer 23

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

Question 24

Intermediate pressure system

Answer 24

Exposed to pipeline pressure

50 psi

Question 25

High pressure system

Answer 25

Exposed to cylinder pressure

Question 26

Components of intermediate pressure

Answer 26

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

Question 27

Dividing point between intermediate - low pressure systems

Answer 27

Flowmeter valve | *intermediate system

Question 28

Low pressure system

Answer 28

Distal to flowmeter valves

Question 29

Low pressure system components

Answer 29

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

Question 30

How to check low pressure system

Answer 30

Attach bulb syringe to common gas outlet

Question 31

Safety relief valves dependent on cylinder pressure

Answer 31

Frangible disk | Spring-loaded

Question 32

Plum Bob

Answer 32

Read at the top of float

Question 33

Rotating ball

Answer 33

Read in the center of float

Question 34

Drager has what type of indicator float?

Answer 34

Rotating ball

Question 35

Dates-Ohmeda has what type of indicator float?

Answer 35

Plumb bob

Question 36

Hypoxic guard is also known as

Answer 36

Proportioning systems

Question 37

Purpose of proportioning systems

Answer 37

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

Question 38

Dated Ohmeda hypoxic guard

Answer 38

Link 25 system (chain/teeth)

Question 39

Bellows should be looked at during

Answer 39

Expiration | Ascending — better detects loss of pressure

Question 40

T/F safe to keep cylinder upright without support

Answer 40

False

Question 41

T/F may leave empty cylinder on machine

Answer 41

F

Question 42

T/F maintain plastic cover on port while installing cylinder

Answer 42

False - do not leave plastic on

Question 43

T/F cylinders are color coded for sole identification

Answer 43

False - they are color coded but ALWAYS read label

Question 44

T/F oiling valves will maintain use

Answer 44

False. - do not oil valves

Question 45

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

Answer 45

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