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J Clin Monit Comput · Dec 2004
Calculation of O2 consumption during low-flow anesthesia from tidal gas concentrations, flowmeter, and minute ventilation.
- Takafumi Azami, David Preiss, Ron Somogyi, Alex Vesely, Eitan Prisman, Steve Iscoe, Andre M De Wolf, and Joseph A Fisher.
- Department of Anesthesiology and Resuscitology, Nagoya City University Medical School, Nagoya, Japan.
- J Clin Monit Comput. 2004 Dec 1; 18 (5-6): 325-32.
AbstractWe present the principles of a new method to calculate O2 consumption (V*O2) during low-flow anesthesia with a circle circuit when the source gas flows, end-tidal O2 concentrations and patient inspired minute ventilation are known. This method was tested in a model with simulated O2 uptake and CO2 production. The difference between calculated V*O2 and simulated V*O2 was 0.01 +/- 0.02 L/min. A similar approach can be used to calculate uptake of inhaled anesthetics. At present, with this method, the limiting factor in precision of measurement of V*O2 and uptake of anesthetic is the precision of measurement of gas flow and gas concentration (especially O2 concentration in end-tidal gas, FETO2) available in clinical anesthetic units.
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