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Flashcards in Mapleson Circuits Deck (53)
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1
Q

Click on the BEST configuration for spontaneous ventilation.

A

Study on!!!!

2
Q

There are — different configurations of the Mapleson circuit

A

6

(A-F)

3
Q

All Mapleson Circuits are classified as —– or non-rebreathing circuits

A

“semi-open”

4
Q

All Mapleson Circuits are classified as semi-open or non-rebreathing circuits. Since inhaled and exhaled gases travel through the same tubing, there is a risk of

A

rebreathing

5
Q

Mapleson Circuits - How Do They Work?

During expiration, gas containing —– enters the corrugated tubing and travels away from the patient

A

Carbon dioxide

6
Q

After expiration but before the next inspiration, the —– continues to washout exhaled gas left inside the corrugated tubing.

A

FGF

7
Q

During inhalation, the patient breathes in fresh gas. If the FGF is —–, the patient will also breathe in exhaled gas leftover in the corrugated tubing.

A

“inadequate”

8
Q

Rebreathing is —– with a higher FGF, a smaller tidal volume, and a longer expiratory time

A

“minimized”

9
Q

—– monitoring is the best method of determining the amount of fresh gas flow required to prevent rebreathing (look at the baseline of the capnograph).

A

End-tidal CO2

10
Q

Mapleson Circuits have a Reservoir bag

A

True

11
Q

Mapleson Circuits have a Fresh gas inlet

A

True

12
Q

Mapleson Circuits have a Corrugated circuit tubing

A

True

13
Q

Mapleson Circuits have an APL valve

A

True

(Except Maplesson E)

14
Q

A Mapleson Circuit a Mask

A

True

15
Q

Mapleson –=- does not contain an APL valve or reservoir bag

A

Mapleson E

16
Q

Mapleson Circuits do Not have Unidirectional valves

A

True

17
Q

Mapleson Circuits do Not have CO2 absorber

A

True

18
Q

Which is the Best Mapleson Circuit?

Well, that depends if the circuit will be used for —– or —– ventilation. You should know which are the best and worst for each mode of ventilation.​

A

Spontaneous or Controlled

19
Q

Mapleson — is the best for Spontaneous Ventilation

A

Mapleson A

(A > DFE > CB)

20
Q

Mapleson — is the worst for Spontaneous Ventilation

A

“Mapleson B”

21
Q

Mapleson — is the best for Controlled Ventilation

A

Mapleson D

(DFE >BC> A)

22
Q

Mapleson — is the worst for Controlled Ventilation

A

“Mapleson A”

23
Q

If you really want to get picky, the amount of rebreathing is a function of many things. These include:

A

Fresh gas flow

Minute ventilation

Mode of ventilation

Respiratory rate

Tidal volume

Inspiratory flow rate

l: E ratio

Volume of the reservoir bag

Volume of corrugated tubing

Use of a mask, LMA, or endotracheal tube.

24
Q

Fresh gas flow affects the amount of rebreathing

True

A

True

25
Q

Minute ventilation affects the amount of rebreathing

A

True

26
Q

Mode of ventilation affects the amount of rebreathing

A

True

27
Q

Respiratory rate affects the amount of rebreathing

A

True

28
Q

Tidal volume affects the amount of rebreathing

A

True

29
Q

Inspiratory flow rate affects the amount of rebreathing

A

True

30
Q

l: E ratio affects the amount of rebreathing

A

True

31
Q

The volume of the reservoir bag affects the amount of rebreathing

A

True

32
Q

The volume of corrugated tubing affects the amount of rebreathing

A

True

33
Q

The use of a mask, LMA, or endotracheal tube affects the amount of rebreathing

A

True

34
Q

It’s impossible to predict exactly how much FGF is required to prevent rebreathing. As a general rule ~ — times the patient’s minute ventilation should be enough in most cases

A

~ 2.5 times

35
Q

It’s impossible to predict exactly how much FGF is required to prevent rebreathing. As a general rule ~ 2.5 times the patient’s minute ventilation should be enough in most cases. There are exceptions, however. A Mapleson A requires a FGF of ~ — L/min during controlled ventilation!

A

~ 20 L/min

36
Q

When to Use a Mapleson Circuit? By knowing the —– and —– of the Mapleson designs, you can easily determine when to use them.

A

“advantages and disadvantages”

37
Q

Mapleson Circuits have —– airway resistance (good for peds)

A

“Less”

38
Q

Mapleson Circuits are Convenient

A

True

39
Q

Mapleson Circuits are —– scavenged

A

“Easily”

40
Q

Which Mapleson Circuit prevents heat loss

A

Bain circuit

41
Q

Mapleson Circuits —– apparatus dead space

A

“increase”

42
Q

Mapleson Circuits require —– FGF to prevent rebreathing

A

high FGF

43
Q

Mapleson Circuits are associated with Loss of heat and humidity

A

True

(Bain circuit prevents heat loss)

44
Q

Mapleson Circuits are an —– use of inhaled anesthetics

A

“inefficient”

45
Q

Mapleson Circuits are associated with the Risk of environmental pollution

A

True

46
Q

Unrecognized kinking of fresh gas hose is possible in —– circuit

A

Bain circuit

47
Q

Unrecognized kinking of fresh gas hose is possible in Bain circuit. Use —– test

A

Pethick test

48
Q

Click on the BEST configuration for spontaneous ventilation.

A

Mapleson A

49
Q

The first circuit is the Mapleson —.

A

Mapleson E

50
Q

The second circuit is the Mapleson —. This is the best configuration for controlled ventilation

A

Mapleson D

51
Q

The third circuit is the Mapleson — or —–.

A

Mapleson F or Jackson-Rees

52
Q

The fourth circuit in the image is the Mapleson —–. This is the best configuration for spontaneous ventilation

A

Mapleson A

53
Q

References:

A

Barash. Clinical Anesthesia. 8th ed. 20 17 . p. 679-680. Nagelhout. Nurse Anesthesia. 6th ed. 2018. p. 249-250.