The goal of this prospective study is to validate the superior vena cava collapsibility index (SVC-CI) as a predictor of fluid responsiveness during laparotomy and open aortic surgery. The SVC-CI and patients' response to fluid will be assessed based on transesophageal echocardiography. The study has three arms, in order to validate SVC-CI under the conditions of laparotomy, aortic cross clamping and high PEEP levels. One of the study arms will be an active comparator arm. The data obtained from this study may help physicians guide intraoperative fluid therapy in a more efficient manner, in order to decrease perioperative mortality.
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Fluid responsiveness
Timeframe: Directly after infusing fluid bolus.