Breathing Circuits 6.2 Flashcards
Match each breathing system with its classification.
1. Semi-open
2. Semi-closed
3. Open
4. Closed
a. no rebreathing and no reservoir
b. no rebreathing with a reservoir
c. partial rebreathing with a reservoir
d. complete rebreathing with a reservoir
breathing circuits
1b
2c
3a
4d
pre-lesson Q1
While providing an anesthetic with a circle system, you observe the EtCO2 waveform not returning to baseline. What is the best course of action at this time? (Select 2).
a. replace the carbon dioxide absorbent
b. increase the patient’s minute ventilation
c. replace the water trap on the EtCO2 monitor
d. increase the fresh gas flow in excess of the patient’s minute ventilation
breathing circuits
A
D
pre-lesson Q2
What is the best Mapleson circuit for a spontaneously ventilating patient?
A
B
C
D
breathing circuits
A
pre-lesson Q3
The Bain circuit: (Select 2)
a. is tested with the Pethick test
b. is a modified Mapleson A
c. delivers fresh gas through the inner tube
d. is best for spontaneous but not controlled ventilation
breathing circuits
a. is tested with the Pethick test
c. delivers fresh gas through the inner tube
pre-lesson Q4
Which component in the circle system protects the patient from excessive airway pressure during spontaneous ventilation?
a. ventilator spill valve
b. carbon dioxide absorber
c. reservoir bag
d. expiratory valve
breathing circuits
c. reservoir bag
most distensible component
post lesson quiz
Benefits of using a low fresh gas flow in a circle system include a/an: (Select 2)
a. increased humidity in the system
b. reduced risk of barotrauma
c. slower reduction in body temperature
d. faster FA/FI equilibration
breathing circuits
a. increased humidity in the system
c. slower reduction in body temperature
post lesson quiz
Which factors affect the extent of rebreathing exhaled gas in the circle system? (Select 2)
a. fresh gas flow
b. length of the inspiratory and expiratory limbs
c. arrangement of the components in the circuit
d. physiologic dead space
breathing circuits
a. fresh gas flow
c. arrangement of the components in the circuit
also: functioning of the unidirectional valves
post lesson quiz
Which components are excluded from the Mapleson circuit design? (Select 2)
a. carbon dioxide absorber
b. APL valve
c. reservoir bag
d. unidirectional valves
breathing circuits
a. carbon dioxide absorber
d. unidirectional valves
post lesson quiz
What are the benefits of the Mapleson breathing circuits? (Select 2)
a. minimal fresh gas requirement
b. allows rebreathing of exhaled gas
c. simplicity of design
d. low airway resistance
breathing circuits
c. simplicity of design
d. low airway resistance
post lesson quiz
Identify the components that are absent in a Mapleson D. (Select 2)
a. reservoir bag
b. unidirectional valves
c. APL valve
d. CO2 absorbent
breathing circuits
b. unidirectional valves
d. CO2 absorbent
review exam
A patient is receiving controlled ventilation with a fresh gas flow of 5 L/min. Which circuit is most likely to cause hypercarbia?
a. Mapleson A
b. Mapleson B
c. Mapleson D
d. Mapleson F
breathing circuits
a. Mapleson A
needs FGF of 20 L/min d/t FGF far from pt; worst for controlled vent
review exam
Which circuit does not contain dead space?
a. semiopen
b. closed
c. semiclosed
d. open
breathing circuits
d. open
open to atmosphere, no deadspace
review exam
Which Mapleson circuits are most likely to be encountered in modern anesthetic practice? (Select 3)
A
B
C
D
E
F
breathing circuits
DEF
“T piece” group
review exam
The Mapleson D is an example of a/an:
a. open circuit
b. semiopen circuit
c. semiclosed circuit
d. closed circuit
breathing circuits
b. semiopen circuit
includes Mapleson A-F
bag reservoir, no rebreathing
review exam
Which circuit contains a reservoir bag but does not allow rebreathing of exhaled gases?
a. semi-closed
b. open
c. semi-open
d. closed
breathing circuits
c. semi-open
review exam
A circle system with a FGF of 3 L/min is an example of a/an:
a. semi-open circuit
b. semi-closed circuit
c. closed circuit
d. open circuit
breathing circuits
b. semi-closed circuit
FGF < Ve
review exam
All of the following allow fresh gas to escape into the atmosphere except a:
a. T-piece
b. simple face mask
c. nasal cannula
d. Bain system
breathing circuits
d. Bain system
semiopen circuit
all others are open circuits
review exam
How do you perform the Pethick test during the pre-anesthetic checkout with a Bain circuit?
1. 1st
2. 2nd
3. 3rd
4. 4th
a. use the oxygen fush valve to fill the circuit
b. close the APL valve
c. remove the occlusion at the elbow while flushing the circuit
d. occlude the elbow at the patient end of the circuit
breathing circuits
1d
2b
3a
4c
review exam
Identify each breathing circuit as:
rebreathing Y/N
reservoir Y/N
1. open
2. semi-open
3. semi-closed
4. closed
breathing circuits
- NN
- NY
- Y(partial)Y
- YY
section 1 flashcard
Relate FGF to each circuit.
1. open
2. semi-open
3. semi-closed
4. closed
breathing circuits
- FGF is non applicable
- FGF must exceed minute ventilation
- FGF can be less than minute ventilation
- FGF is just enough to support the patient’s gas consumption
section 2 flashcard
List 4 synonyms for the adjustable pressure-limiting valve.
breathing circuits
- pressure relief valve
- relief valve
- overspill valve
- pop-off valve
many others as well
section 2 flashcard
Where is the most common site for a disconnect in a breathing circuit?
breathing circuits
the y-piece
section 2 flashcard
The ASTM requires the pressure inside an adult-sized (3L) reservoir bag does not exceed an internal pressure of:
breathing circuits
60 cm H2O
section 2 flashcard
What are the 2 causes of inspired CO2?
breathing circuits
- incompetent unidirectional valve
- carbon dioxide absorbent exhaustion
section 2 flashcard
