1. Understanding Mapleson Circuits
Dr Anderson

2. Anaesthesia breathing systems
An anaesthesia breathing system is a series of components that facilitates transport of gases from the anaesthesia machine to the patient

3. Components of an anaesthesia circuit
Ports
Machine to system
System to patient
Patient to atmosphere
Gas resevior
Corrugated tubing
CO2 absorber

4. Requirements of a breathing system
Quick and accurate delivery of gas
CO2 elimination
Minimal dead space
Low resistance

5. Desirable attributes of a breathing system
Gas economy
Conservation of heat
Humidification of inspired gas
Lightweight
Convenient
Adaptable
Control of pollution

6. Classification of circuits
Open
Semi Open
Semi Closed

7. Open Systems Ether mask Insufflation advantage Disadvantage
No rebreathing
No reservoir bag
No valves
Spontaneous ventilation only
FGF unrestricted
Poor depth control
simple
pollution

8. Differentiation between Mapleson systems
Component arrangement
FGF requirements
rebreathing
SV/CV performance

9. Mapleson classification
Reservoir bag on afferent limb
Mapleson A, B, C Lack circuit
Reservoir bag on efferent limb
Mapleson D, E, F Bain circuit

11. A look at the functioning of the circuits

12. Advantages of Mapleson systems
Simplicity
Less effect on EtCO2
Retention of heat and moisture
Less airway resistance
Lightweight
MRI compatable

13. How to test a Bain Circuit