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THE CIRCLE SYSTEM
Although Mapleson circuits overcome some of the disadvantages of the insufflation and draw-over sys-tems, the high fresh gas flows required to prevent rebreathing of CO2 result in waste of anesthetic agent, pollution of the operating room environment, and loss of patient heat and humidity (Table 3–3). Inan attempt to avoid these problems, the circle system adds more components to the breathing system.
The components of a circle system include: (1) a CO2 absorber containing CO2 absorbent; (2) a fresh gas inlet; (3) an inspiratory unidirectional valve and inspiratory breathing tube; (4) a Y-connector; (5) an expiratory unidirectional valve and expiratory breathing tube; (6) an APL valve; and (7) a reservoir (Figure 3–8).
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