In order to predict fluid responsiveness in the operating room and therefore benefit of performing fluid administration to improve patient's hemodynamic status, it will test two ventilation strategies : the Tidal Volume Challenge (VtC) and the Lung Recruitment Maneuver (LRM). The objective is to determine whether the variation of 2 parameters such as pulse pression variation (PPV) and stroke volume variation (SVV) during these 2 strategies, allows to predict fluid responsiveness in the operating room for any heavy surgery. All patients will benefit from the 2 ventilation strategies then a fluid administration, called " fluid challenge ", will be performed to discriminate the true responders and others. The order of the ventilation strategies will be determined by randomization.
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The area under the ROC curve (AUC) of the variation of the pulsed pressure (VPP) during the tidal volume challenge (VtC).
Timeframe: throughout surgery (mean length expected between 3 and 5 hours). Measurements performed during sequences of 30 minutes that can occur several times during surgery