Anaesthetic Machine Flashcards Preview

Veterinary Nursing Anaesthesia and Analgesia > Anaesthetic Machine > Flashcards

Flashcards in Anaesthetic Machine Deck (28)
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1

What is the function of the anaesthetic machine

- deliver gaseous inhalational anaesthesia
- Provide steady flow of anaesthetic gases to patient
- Allows adjustments to be made to rate of flow according to needs

2

What is the anaesthetic machine composed of?

- Gas cylinders (or pipelines)
- Pressure gauge
- Pressure reducing valve
- Flowmeters
- Vaporisers
- Common gas outlet

3

Why was the PIN system designed for cylinders?

- Ensures correct cylinder is connected and to the correct port

4

What is 'Piped gas'

when gas is stored outisde of the building and pipelines carry the gases from exterior of the building to connect to anaesthetic machine

5

What is the function of an oxygen generator?

- May generate O2 from room air via pressure sieve

6

What is the function of the pressure gauge?

- Shows the pressure of gas in the cylinder and therefore indicates the remaining content

7

What is the pressure gauge unreliable for? Why? And how do you instead measure this cylinder?

- Unreliable for N2O
- Due to being stored part liquid and part gas
- Instead should be weighed

8

Name the two benefits of the pressure reducing valve?

- Safer
- Reduces pressure of gas coming from cylinder making it easier to control
- Avoids damage to patient respiratory tract

9

Where is the pressure reducing valve located?

between cylinder and other parts of machine

10

What kind of trauma can occur without the pressure reducing valve?

Barotrauma

11

What is the function of flowmeters?

- Show level of gas flow supplied to the patient
- Adjust level of gas flow to the patient

12

When might readings be inaccurate?

- Tube is tilted
- Tube is dirty
- Bobbin or ball read from wrong point

13

Where should the bobbin be read from?

the top

14

Where should the ball be read from

the middle

15

What are vaporisers?

- Liquid volatile agent to be mixed with carrier gas

16

What are the two types of vaporiser and which is more common?

- In-circuit
- Out-of-circuit (more common)

17

Name a circuit that uses in-circuit vaporisers?

- Circle circuit

18

How do out-of-circuit vaporisers work?

Fresh gas flow from the machine vaporises the inhalational agent

19

What are modern 'tec' vaporisers also known as?

- Compensated vaporisers

20

Why is the modern tec vaporisers used?

- Allow controlled amounts of volatile agent to be delivered
- Adpated to compensate for the variable factors e.g. temperature of agent

21

What is the common gas outlet?

Where gaseous anaesthetic connects to the patient supply (circuit)

22

Name 3 safety features of the anaesthetic machine?

- Pin-index cylinders
- Pipeline connectors
- Oxygen alarm
-Vaporiser key fillers
- Emergency o2 flush

23

What should you do before using the emergency o2 flush?

- Disconnect patient

24

What is the function of the water canister and when is it used?

- Absorbs carbon dioxide
- Used in re-breathing systems

25

Why is scavenging important? (name 2)

- protect personnel
- Minimises exposure to waste gases

26

What is long term exposure to vaporiser gasses linked to ?

- abortions
- kidney/liver failure
- congenital abonormalities

27

What is short term exposure to vaporiser linked to?

- Fatigue
- Headaches
- Nausea
- Irritability

28

How do you minimise the risk when using vaporisers and the anaesthetic machine? Name 5

- Adequate ventilation of workplace
- Effective scavenging system in place
- Sensible working practices
- Passive scavenging
- Active-passive scavenging
- Activated charcoal
- Active system
- Monitor pollution
- Ensure equipment is in order
- Minimise use of masks