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A low flow open circle system for anaesthesia Part 2: Clinical evaluation
Author(s) -
HOLDCROFT A.,
CHAKRABARTI M. K.,
WHITWAM J. G.
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.tb14742.x
Subject(s) - enflurane , nitrous oxide , anesthesia , medicine , fresh gas flow , oxygen , ventilation (architecture) , carbon dioxide , halothane , chemistry , sevoflurane , mechanical engineering , organic chemistry , engineering
Summary A prototype valveless ventilator was attached by open deadspace tubing to a circle system and used to ventilate the lungs of 12 patients with low flows of anaesthetic gases for periods between 60 and 120 minutes during intra‐abdominal surgery. Anaesthesia was induced with thiopentone and maintained with nitrous oxide 50% in oxygen and enflurane. This was reduced to 2 litres/minute after a 10‐minute period of nitrogen wash out and stabilisation of anaesthetic gas concentration, with an initial anaesthetic gas flow of 6 litres/minute. The concentration of oxygen, carbon dioxide, nitrous oxide and enflurane were measured in the outflow from both the anaesthetic machine and the inspiratory limb of the circle system. The measured mean inspired oxygen and nitrous oxide concentrations showed no significant variation throughout the low flow period of the study. This new low flow open circle ventilation system appears to offer some advantages in terms of safety and versatility over other systems which are discussed.