The Enteral Resuscitation In Intensive Care Pilot- Study

* Inclusion criteria: * Patient intubated within the last 72h * Age \>18 years * Expected required fluid volume may not exceed 4 mL/kg/h (permanently, during at least 24 hours). * Negative pregnancy test in female patients of childbearing potential * Informed consent. For patients that are temporarily unable to consent a * subsequent informed consent must be provided. * Exclusion criteria: * Evidence of severe gastrointestinal disease defined as * Gastrointestinal Failure with \> 3 symptoms (see below) or * Lactate \>3mmol/L when mesenterial ischemia is a probable cause * Clinical signs of intra-abdominal hypertension and an increase of intra-abdominal pressure of \>20 mmHg. * Patients who cannot receive early enteral nutrition due to conditions such as prone positioning in consequence of conditions such as acute respiratory distress syndrome * Pregnancy * Abdominal surgery in the last 3 months (unless all involved physicians, study investigators and caretaking doctors agree that the surgical event does not constitute a limitation for enteral fluid administration) * Postoperative patients with consecutive admission to ICU * Extracorporeal Kidney-Replacement Therapy before intubation * At the discretion of the Investigator Symptoms of Gastrointestinal Failure: * Absent bowel sounds * Bowel distension * Vomiting/regurgitation volume \>500 ml * GI bleeding * Diarrhoea (liquid stool \>3 times a day) * Distended stomach on ultrasound exam…