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)
