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Minimum fresh gas flow requirements of anaesthetic breathing systems during spontaneous ventilation: a graphical approach
Author(s) -
DORRINGTON K. L.,
LEHANE J. R.
Publication year - 1987
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/j.1365-2044.1987.tb05318.x
Subject(s) - medicine , fresh gas flow , breathing , anesthesia , ventilation (architecture) , flow (mathematics) , mechanics , sevoflurane , thermodynamics , physics
Summary A general solution is presented to the problem of finding the minimum fresh gas flow requirements, during spontaneous ventilation, of anaesthetic breathing systems in the Mapleson classification. The solution is applicable to any pattern of breathing, dead space volume and tidal volume. The method is graphical and its use and understanding require no mathematical skills. However, if an analytical form of the respiratory waveform is known, the method is easily extended by use of calculus to obtain a precise analytical solution.