Fall in inspired oxygen and anaesthetic agent concentrations during change of soda lime absorber
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Updated: Apr 23, 2026

Operation of a 25 KWth Calcium Looping Pilot-plant with High Oxygen Concentrations in the Calciner
Published on: October 25, 2017
Byrappa Vinay1, Kadarapura Nanjundaiah Gopalakrishna, Ganne S Umamaheswara Rao
1Department of Neuroanaesthesia, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, 560029, India.
Abstract:
Following an episode of reduction in inspired oxygen concentration (FiO(2)) and inhalational agent concentration (Fi agent) during the changing of a soda lime absorber, We conducted an in vitro experiment to understand the impact of disconnection of the absorber on inspired gas dilution at different fresh gas flows. We found that both in Dräger Fabius GS and Primus anaesthesia work stations, disconnection of the absorber caused progressive reduction in FiO(2) and Fi agent as the FGF was decreased. The operating principle of fresh gas decoupling (FGD) valve is a potential source of this complication, which must be kept in mind while changing the soda lime during the course of surgery where an anaesthetic work stations utilizing FGD valves are used.
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