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Drawover anaesthetic systems
Author(s) -
MACKIE A. M.
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.tb03044.x
Subject(s) - medicine , oxygen delivery , oxygen , expiration , anesthesia , volume (thermodynamics) , ventilation (architecture) , volumetric flow rate , respiratory system , mechanics , thermodynamics , chemistry , physics , organic chemistry
Summary The factors that determine the inspired oxygen concentration delivered by drawover anaesthetic systems were studied in the laboratory and in anaesthetised patients. The inspired oxygen concentration is dependent upon oxygen flow, reservoir volume and total ventilation; respiratory rate and inspiration: expiration ratio have a small influence. A reservoir of at least of 1 m corrugated tube (internal volume 415 ml) makes optimal use of a 4 litres/minute oxygen flow. Delivery of a safe inspired oxygen concentration can be ensured with economical oxygen flows.