Breathing Circuits Flashcards
What are examples of an open circuit?
NO rebreathing and NO reservoir:
Insufflation
Nasal Cannula
Open drop
Simple Mask
What are examples of a semi-open circuit?
NO rebreathing WITH a resevoir:
Mapleson Circuit
Circle Circuit (if FGF > Mv)
What are examples of a semi-closed circuit?
PARTIAL rebreathing WITH a resevoir:
Circle system with FGF < Mv)
What are examples of a closed circuit?
FULL rebreathing WITH a resevoir:
Circle system when FGF is very low and the APL is closed
What are two common system malfunctions that increase CO2 rebreathing?
- Exhausted scrubber
- Incompetent Unidirectional Valves
Which Mapleson circuit is best for spontaneous ventilation?
Mapleson A
Which Mapleson circuit is worst for spontaneous ventilation?
Mapleson B
Which Mapleson circuit is best for controlled ventilation?
Mapleson D
Which Mapleson circuit is worst for controlled ventilation?
Mapleson A
Unlike circle systems, Mapleson circuits do not have:
Unidirectional Valves
CO2 absorbers
ALL Mapleson circuits are ________
semi-open (non-rebreathing) circuits
Where is the APL valve located in Mapleson A and D circuits:
A: APL is by the Airway
D: APL is by the Drugs
Where is the fresh gas inlet in Mapleson A and D circuits?
A: Near the bag
D: Near the patient
Mapleson A circuits are the only circuits that:
have the FGF next to the bag
The Mapleson D is the only circuit with:
the APL valve away from the patient
What are the advantages of Mapleson circuits?
What are the disadvantages of Mapleson circuits?
What FGF is required to prevent rebreathing with a Mapleson circuit?
Generally 2.5x the Mv
What is the Bain system?
A modified Mapleson D
Mapleson A
Mapleson B
Mapleson C
Mapleson D
Mapleson E
(Ayre’s T Piece)
Mapleson F
(Jackson Reese)
The Jackson Reese is also known as the:
Mapleson F
The resistance to gas flow through the anesthesia circuit is:
Less than 1 cmH2o per liter per minute
Less than half what it is for normal breathing
what is the internal volume of the typical adult anesthesia circuit?
400-500ml
What is the max amount of CO2 that can be absorbed by 100g of absorbent?
26L for every 100g of absorbent
By weight, what is the primary component of soda lime?
Calcium hydroxide