In this study investigators will study the association between the use of an hemodynamic monitoring system and the anesthetic consumption in patients following major abdominal surgery. Investigators will randomise patients for a control group and an intervention group. Patients belonging to intervention group will be monitored with a non-invasively continue system (Acumen IQ cuff sensor), while the control group will be monitored with a non-invasive intermittent pressure system. The total amount of mL of Sevoflurane will be registered in both groups and the difference will be considered as the aim of our study
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Reduction in Anesthetic consumption
Timeframe: During surgery