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Respiratory feedback effects on vaporisers in circle systems
Author(s) -
White D.,
Royston B.
Publication year - 1998
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1046/j.1365-2044.1998.00367.x
Subject(s) - isoflurane , medicine , anesthesia , respiration , respiratory system , fresh gas flow , ventilation (architecture) , stimulus (psychology) , anatomy , sevoflurane , psychology , engineering , psychotherapist , mechanical engineering
We studied a group of spontaneously breathing patients anaesthetised for routine orthopaedic surgery using a circle system and isoflurane in a Komesaroff vaporiser within the circle. We observed and recorded: (1) the change in inspired isoflurane concentration caused by changing the fresh gas flow, (2) the increased respiration produced by surgical stimulus and the resulting increase in isoflurane concentration, (3) the respiratory depression produced by opioids and the consequent decrease in isoflurane concentration. We consider this regulation of anaesthetic uptake by the patient to be beneficial.