In 1954 Mapleson described and analyzed five different semiclosed anesthetic systems, and they are classically referred to as Mapleson systems
Type A - Magill's circuit
Best for Spontaneous Ventilation
Modified A - Lack's circuit
Type A - Magill's circuit
Best for Spontaneous Ventilation
Modified A - Lack's circuit
Mnemonic : SMAL
Type B & C - Obsolete
Type D - Bain's Circuit
Best for Controlled Ventilation
Modified D - Fenlon
Type B & C - Obsolete
Type D - Bain's Circuit
Best for Controlled Ventilation
Modified D - Fenlon
Mnemonic : BCDF
Type E - k/a Ayre's T piece
Used in neonates
Type F - Jackson-Rees' modification of the Ayre's T-piece
Used in child < 6 year or < 20 Kg
Type E - k/a Ayre's T piece
Used in neonates
Type F - Jackson-Rees' modification of the Ayre's T-piece
Used in child < 6 year or < 20 Kg
E & F are Valveless
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