Breathing Circuits

Question 1

Open breathing circuit contains

Answer 1

No rebreathing and no reservoir

Question 2

Semi-open circuit contains

Answer 2

No rebreathing with a reservoir

Question 3

Semi-closed circuit contains

Answer 3

Partial rebreathing with a reservoir

Question 4

Closed circuit contains

Answer 4

Complete rebreathing with a reservoir

Question 5

A mapleson circuit is what type of circuit?

Answer 5

Semi-open

Question 6

FGF and semi-open circuit

Answer 6

FGF must exceed minute ventilation

Question 7

FGF and semi-closed circuit

Answer 7

FGF can be less than minute ventilation

Question 8

FGF and closed circuit

Answer 8

FGF is just enough to support the patient’s gas consumption

Question 9

List 4 synonyms for the adjustable pressure-limiting valve.

Answer 9

Pressure relief valve
Relief valve
Overspill valve
Pop-off valve

Question 10

Where is the most common site for a disconnect in a breathing circuit?

Answer 10

The y-piece

Question 11

The ASTM requires that the pressure inside an adult-sized (3 L) reservoir bag does not exceed an internal pressure of:

Answer 11

60 cm H2O

Question 12

What are 2 causes of inspired carbon dioxide?

Answer 12

Incompetent unidirectional valve.
Carbon dioxide absorbent exhaustion.

Question 13

What is the BEST Mapleson circuit for a spontaneously ventilating patient?

Answer 13

A

Question 14

Answer 14

F

Question 15

Answer 15

D

Question 16

Answer 16

A

Question 17

Answer 17

E

Question 18

Answer 18

C

Question 19

Answer 19

B

Question 20

Which 4 components are present in a Mapleson D circuit?

Answer 20

Reservoir bag
Corrugated circuit tubing
Fresh gas inlet
APL valve

Question 21

Which 2 components are NOT present in a Mapleson D circuit?

Answer 21

Unidirectional valve
CO2 absorber

Question 22

Which Mapleson is the best choice for spontaneous ventilation?

Answer 22

A

Question 23

Which Mapleson is the worst choice for spontaneous ventilation?

Answer 23

B

Question 24

Which Mapleson is the best choice for controlled ventilation?

Answer 24

D

Question 25

Which Mapleson is the worst choice for controlled ventilation?

Answer 25

A

Question 26

Test used for Bain circuit

Answer 26

Pethick test.

Question 27

Bain circuit delivers fresh gas through

Answer 27

the inner tube

Question 28

Exhaled gas in Bain circuit travels through

Answer 28

outer tube (corrugated tubing)

Question 29

Bain circuit uses what kind of design?

Answer 29

Coaxial

Question 30

Why is the Pethick test used for Bain circuits?

Answer 30

The inner tube is at risk for kinking and disconnection

Question 31

Bain circuit is what type of Mapleson system?

Answer 31

Modified Mapleson D

Question 32

What is another name for a modified Mapleson D?

Answer 32

Bain System

Question 33

How is the incoming fresh gas flow warmed in the Bain circuit?

Answer 33

By the exhaled gas

Question 34

When using a Bain circuit, the FGF should be at least how many times higher than the minute ventilation?

Answer 34

2.5x

Question 35

What are 2 the benefits of the Mapleson breathing circuits?

Answer 35

Low airway resistance Simplicity of design

Question 36

What are 2 disadvantages of the Mapleson breathing circuits?

Answer 36

Risk of rebreathing exhaled CO2. Higher fresh gas requirement.

Question 37

2 benefits of using a low fresh gas flow in a circle system include

Answer 37

increased humidity in the system. slower reduction in body temperature.

Question 38

Which 3 factors affect the extent of rebreathing exhaled gas in the circle system?

Answer 38

Fresh gas flow. Arrangement of the components in the circuit. Proper functioning of the unidirectional valves.

Question 39

Dead space in a circuit occurs at

Answer 39

the y-piece

Question 40

Which component in the circle system protects the patient from excessive airway pressure during spontaneous ventilation?

Answer 40

Reservoir bag

Question 41

Which Mapleson circuit does not include an APL valve or reservoir bag?

Answer 41

Mapleson E

Question 42

Mapleson E is also called

Answer 42

Ayre's T-piece

Question 43

Which Mapleson circuit is MOST likely to cause hypercarbia during controlled ventilation.

Answer 43

A

Question 44

Which circuit does not contain dead space?

Answer 44

Open

Question 45

Which Mapleson circuits are MOST likely to be encountered in modern anesthetic practice?

Answer 45

D, F, E

Question 46

What 3 Mapleson systems are part of the "T-piece" group

Answer 46

D, F, E

Question 47

Which Mapleson system is the reverse set up of the Mapleson A?

Answer 47

Mapleson D

Question 48

Where does fresh gas enter for D, F, E systems

Answer 48

At the proximal end of the circuit

Question 49

Where is the APL valve located for D, F, E systems

Answer 49

Distally near the reservoir bag

Question 50

Which circuit contains a reservoir bag but does not allow rebreathing of exhaled gases?

Answer 50

Semiopen

Question 51

A circle system with a fresh gas flow of 3 L/min is an example of a/an:

Answer 51

semiclosed circuit.