Mapleson’s classification of anesthetic breathing system
The Mapleson D may be described as a co-axial modification of the basic T-piece system, developed to facilitate scavenging of waste anaesthetic gases.
Circuit
Describes four systems A, B, C, D
Classifies the Bain system as Mapleson
Describes the T-piece as M
Describes the T-piece system as requiring a fresh gas flow rate of 1.5 – 2 times the minute volume