In general anesthesia, recovery and emergency resuscitation
procedures involve the use of a breathing system. The principle of
anesthetic systems is to efficienty eliminate exhaled carbon
dioxide, without greatly increasing dead space or resistance. In
1954 Mapleson classified breathing systems based on their
efficiency in eliminating carbon dioxide during spontaneous
respiration. The breathing systems are classified in order of fresh
gas flow (FGF) to prevent rebreathing during spontaneous
respiration. Further information on the Mapleson classification can
be found in our educational section.