Volume expansion is the cornerstone of perioperative hemodynamic optimization. The main objective of volume expansion is to increase and to maximize stroke volume. Despite national and international recommendations, stroke volume monitoring is clearly not widely adopted. This is mostly due to the cost and the invasiveness of the devices allowing stroke volume monitoring. End tidal carbon dioxide is monitored in all patients undergoing general anaesthesia and is totally non-invasive. A strong relationship between stroke volume and end tidal carbon dioxide have been already demonstrated. The aim of the present study is to determine if change in End Tidal Carbon Dioxide can assess the stroke volume effects of a volume expansion of 250ml of crystalloid in the operating room
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End Tidal Carbon Dioxide measure
Timeframe: Beggining time of volume expansion of 250ml of crystalloid during surgery
End Tidal Carbon Dioxide measure
Timeframe: 1 minute after the end of volume expansion of 250ml of crystalloid during surgery