Mapleson categorized these systems based on the arrangement of their components: the fresh gas inlet, the reservoir bag, the corrugated tubing, and the APL (Adjustable Pressure Limiting) valve. 1. Mapleson A (Magill Circuit)
Because the inner fresh gas tube in a Bain circuit can disconnect inside the outer tube, you must test it: mapleson circuit
Rarely used in modern practice. The Mapleson C is essentially a "Waters' circuit" without the CO2 absorber, often used for manual resuscitation or patient transport. 3. Mapleson D (Bain Circuit) Mapleson categorized these systems based on the arrangement
The primary clinical challenge with Mapleson circuits is avoiding —the inspiration of previously exhaled $CO_2$. Unlike circle systems that chemically absorb $CO_2$ via soda lime, Mapleson circuits flush $CO_2$ out through the APL valve using high fresh gas flows. The efficiency of a circuit is determined by how little fresh gas is required to prevent rebreathing. The Mapleson C is essentially a "Waters' circuit"