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Combined air and oxygen entrainment. Effect on the percentage output of fixed performance masks
Author(s) -
LYEW M. A.,
HOLLAND A. J.,
METCALF I. R.
Publication year - 1990
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.1365-2044.1990.tb14440.x
Subject(s) - medicine , entrainment (biomusicology) , oxygen , air entrainment , anesthesia , mechanics , physics , rhythm , chemistry , organic chemistry
Summary Secondary oxygen was added to air entrained by the primary jet of a fixed performance mask. Twenty such masks, in each of six groups rated at 24%, 28%, 31%, 35%, 40% and 50%, gave higher O 2 percentages equivalent to those calculated from an equation that related the O 2 concentration to the secondary flow. Actual values of both were closely correlated, with regression slopes and intercepts similar to those derived from this equation. This technique is simple and predictable in altering the composition of an air‐oxygen mixture delivered to the patient.