Equipment

Question 1

What is the function of the anaesthetic machine?

Answer 1

deliver inhalation agent and oxygen

enable IPPV

Question 2

What is the anaesthetic machine made up of?

Answer 2

gas supply
regulators
needle valves
emergency flush valve
vaporiser
low oxygen alarm (sometimes)
bodok seal- ensures gas tight seal
pressure gauge- measured in kPa

Question 3

What does a calibrated vaporiser do?

Answer 3

produces an accurate known concentration of anaesthetic vapour
protects the agent from light
can only be used for the volatile agent it is designed for

Question 4

What does the emergency flush do?

Answer 4

gives a rapid flow of 100% o2 to patients, bypassing rotameters and vaporiser

Question 5

What does an active scavenge system consist of?

Answer 5

Transfer system- attached to expiry port
Receiving system- prevents excessive positive or negative pressure
Disposal system- delivers gas to external environment

Question 6

What does a passive scavenge system consist of?

Answer 6

relies on patients own respiratory efforts in order to void waste gases to outside system or charcoal absorber

Question 7

What does an active passive scavenge system do?

Answer 7

same tubing system as passive

tube is vented into a forced ventilation system and air must not be recirculated

Question 8

What are benefits of a feline V-Gel?

Answer 8

bowl envelopes whole larynx
high seal pressure- positive pressure ventilation
suitable for brachy breeds
no cuff inflation required

Question 9

Benefits of a rabbit V-Gel?

Answer 9

high seal
more mouth space and security for dentals
noisy breathing avoided

Question 10

How does a rebreathing circuit work?

Answer 10

soda lime canister, expired gas passes through canister and soda lime removes CO2, allowing same gas to be breathed again by the patient

Question 11

How does a non-rebreathing circuit work?

Answer 11

Uses high flow rates of gas to flush CO2 from the system into the atmosphere

Question 12

Which circuits are non-rebreathing?

Answer 12

Ayres T-Piece
Magill
Coaxial lack
Parallel lack
Mini lack
Bain

Question 13

Which circuits are rebreathing?

Answer 13

Circle

To and Fro

Question 14

What are the weight ranges for non-rebreathing circuits?

Answer 14

T-Piece: under 10kg
Bain: 10-30kgs
Lack: 10-40kgs
Mini lack: under 10kg

Question 15

What are advantages and disadvantages for non-rebreathing?

Answer 15

Advantages -
Low resistance
inexpensive
no soda lime required
more precise control over consciousness
Disadvantages-
high volatile consumption
different circuits require different flow rates
higher gas flow requirements

Question 16

What are advantages and disadvantages for rebreathing circuits?

Answer 16

Advantages- 
low FGF
low volatile rate
less pollution
ventilation controlled
Disadvantages-
Greater breathing resistance
expensive
slow to change anaesthetic level
cumbersome
regular absorbent replacement required