In the present work the investigators will study the accuracy of the MAAS (Minimal-flow Autocontrol Anesthesia System) method to estimate the percentage of halogenated anesthetic (HA) to be supplied to the anesthetic circuit based on the estimation of HA uptake during the maintenance phase. The investigators will evaluate the accuracy of sevoflurane and desflurane vaporizers to guarantee the administration of that amount of estimated HA, thus guaranteeing the maintenance of the target concentration of HA at the end of expiration: end-tidal target HA% (ettHA%). To do this, the investigators will quantify the number of adjustments that need to be made to each vaporizer to maintain ettHA%. As secondary objectives, the investigators will analyze the time to reach the target concentration of HA, the deviations that occur from that concentration despite the correct application of the method, and the consumption of HA during the procedure. Through the entire procedure, all participants will be ventilated under a tailored open lung approach (tOLA) strategy.
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Changes made in the sevoflurane vaporizer
Timeframe: 60 minutes, starting from the end of Phase sevo 1 (once filled the HPO compartment)
Changes made in the desflurane vaporizer
Timeframe: 60 minutes, starting from the end of Phase desflu 1(once filled the HPO compartment)