In this study investigators explore the effects of a dynamic elastance guided protocol compared to a stroke volume variation fluid therapy on lactate levels during major abdominal surgery. Hence investigators created two groups: in the intervention group fluids are given in fluid-responders (SVV \> 13%) based on high value of dynamic elastance (ie. Eadyn \> 0.9). In the standard group fluids are administered when SVV \> 13%.
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lactate levels
Timeframe: at the end of surgery