Breathing systems

Question 1

What should always be done to the expiratory/APL valve before attaching a patient?

Answer 1

OPEN

Closed = high pressure, lung damage!

Question 2

When doing a leak test, what should be done to expiratory/APL valve?

Answer 2

Closed

RE-OPEN BEFORE ATTACHING PATIENT

Question 3

Re-breathing circuits can be used in patients over what size?

Answer 3

25kg

Question 4

What is the flow rate for rebreathing circuits?

Answer 4

10-50mls/kg/min
(Or
2.5-3L/min until anaesthetic stable
Then 0.5-1L/min)

Question 5

What is the flow rate for non-rebreathing circuits?

Answer 5

200ml/kg/min

Consider circuit factor

Question 6

What is the circuit factor for Mapleson A (Magill)? What weight must be the animal be?

Answer 6

Circuit factor 1

Weight >10kg

Question 7

What is the circuit factor for Mapleson D? What weight must be the animal be?

Answer 7

Circuit factor 2-2.5

Weight <10kg

Question 8

What is the circuit factor for Mapleson E (Ayre’s T-piece)? What weight must be the animal be?

Answer 8

Circuit factor 2.5-3

Weight <10kg

Question 9

What is the circuit factor for Mapleson F (Jackson-Rees)? What weight must be the animal be?

Answer 9

Circuit factor 2.5-3

Weight <10kg

Question 10

What is the circuit factor for parallel lack? What weight must be the animal be?

Answer 10

Circuit factor 1-1.5

Weight >10kg

Question 11

What is the circuit factor for Coaxial Bain (modification of Mapleson D)? What weight must be the animal be?

Answer 11

Circuit factor 2-2.5

Weight >10kg