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CVSOH BVSc3 > Breathing systems > Flashcards

Breathing systems Flashcards

1
Q

What is dead space?

A

Volume of gas that does not eliminate CO2

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2
Q

What is tidal volume?

A

Volume of gas entering the lung with each inspiration

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3
Q

What is the minute volume?

A

Volume of gas entering the lungs in each minute

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4
Q

What is rebreathing?

A

When the inspired gases reaching the alveoli contain more CO2 than can be accounted for by mere re-inhalation from the patients dead space gas

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5
Q

What are metabolic oxygen requirements?

A

Amount of oxygen required each minute for metabolic processes

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6
Q

How big should the reservoir bag be?

A

3-6 x tidal volume

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7
Q

What are the two types of breathing system tubing?

A

Coaxial vs parallel

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8
Q

What is coaxial tubing?

A

One tube inside the other

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9
Q

What are the pros and cons of parallel tubing in breathing systems?

A

Increased drag

Less resistance

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10
Q

What is a problem with coaxial tubing in breathing systems?

A

Inner hose can disconnect

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11
Q

What type of breathing system is circle?

A

Rebreathing

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12
Q

What type of breathing system are T-piece, bain and lack?

A

Non rebreathing

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13
Q

What features does a rebreathing system have that are different to a non-rebreathing system?

A

Has a soda lime canister on it to remove CO2

Has unidirectional valves - so gas flow is in one direction

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14
Q

What happens when soda line absorbs CO2?

A

Water and heat are produced

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15
Q

What does a non-rebreathing system use to remove CO2?

A

Fresh gas flow

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16
Q

When are rebreathing systems not used?

A

For smaller animals - has a higher resistance

17
Q

What are the disadvantages of a non-rebreathing system?

A

Higher fresh gas flow - more expensive

18
Q

What is the equation for minute volume?

A

Tidal volume x resp rate

19
Q

How do you work out tidal volume?

A

10mL/kg

20
Q

How do you work out the fresh gas flow in non-rebreathing systems?

A

Minute volume x circuit factor

21
Q

What is the circuit factor in T-piece and bain?

A

2-3

22
Q

What is the circuit factor in lack?

A

1

23
Q

How do you work out the fresh gas flow in rebreathing systems?

A

Large animals - 5mL/kg

Small animals - 10mL/kg then reduce to 1L/min

24
Q

Which system is not suitable for prolonged ventilation (IPPV)?

A

Lack

25
Q

What breathing system is the best for very small animals (<10kg)?

A

Ayres T-piece - low resistance

26
Q

What size animals are bain and lack suitable for?

A

> 10kg

27
Q

What size animals is the circle breathing system suitable for?

A

Variety

28
Q

Which breathing system has a mini version for animals >1kg?

A

Lack - mini lack

29
Q

What part of the breathing system most commonly causes incidents if left closed?

A

APL valve - adjustable pressure limiting valve

CVSOH BVSc3 (60 decks)

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