In this study investigators will explore the association between intraoperative arterial hypotension and cerebral oxygen saturation in patients scheduled for major abdominal surgery. Investigators will assign patients to control or interventional group. In this last group arterial hypotension will be avoided based on a HPI (Hypotension Predictive Index) protocol. In the control group arterial hypotension will be promptly treated according to hemodynamic variables.
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Cerebral tissue oximetry
Timeframe: immediately after surgery