Estimation of deliverd concentration from usual anesthetic monitoring

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Estimation of delivered concentration from usual anesthetic monitoringThe algorithm by which reversery estimate delivered anesthetic concentration (Fdelan) was investigated from information of inspired and expired anesthetic gas monitoring (Flan, Fetan) by the pharmacokinetic model.It was desired to use precise pharmacokinetic simulation model for anesthetic circuit, for predicting delivered anesthetic concentration using monitored Flan and Fetan.However, we found that there was no precise anesthetic circuit model to be used for the reverse estimation of Fdelan at a practical level.Besides the physical capacity of the anesthetic circuit, anesthetic absorbing circuit material affect anesthetic wash-out and wash-in process in the anesthetic circuit. A basic examination was added and focused on the model about the adsorption of anesthetic to the circuit material such as rubber.In our conclusion, the anesthetic circuit has 6.6 L physical circuit space and anesthetic absorbing compartments (0.8L fast compartment and 0.5 L slow compartment, in which diffusion rate of 0.01 L/min, and 0.001 L/min were observed respectively between anesthesia circuit. We found that CO2 absorbent was most large compartment (3L) absorbing anesthetic and diffusion rate (>3L/min) between physical circuit was also highest. And we found that the small elimination of anesthetic through circuit wall compartment (0.018 L/min)