Evaluation of Gastric Echography for Early Diagnosis of Nutritional Intolerance.

5 mL blood sample taken at the same time as a blood sample scheduled in regular patient management before the introduction of enteral nutrition and 24H after

"In 3 steps:~* before initiation of enteral nutrition~* 4h after initiation of enteral nutrition~* After 24 hours of enteral nutrition"

"At inclusion:~Calculation of severity scores; collection of reason for admission and demographic data; main comorbidities and treatments administered; the time between admission and nutritional recovery; risk factors for gastroparesis; current organ failure and supplements. Presence of parenteral nutrition, ongoing carbohydrate intake. Caloric objective.~Within the first 24 hours, collection of:~* echographic parameters at H0, H4 and H24~* venous congestion parameters~* biological parameters within 24 hours Constitution of a biobank (at H0 and H24)~Within the first 7 days, collection of:~* the occurrence or not of the primary endpoint (and time to occurrence).~* symptoms of gastrointestinal dysfunction~Within 30 days, collection of:~* organ failure and replacement over the period, and mortality.~* the occurrence or not of ventilator-associated lung disease (VAPD). Each patient is followed for 30 days. Survival will be assessed at 30 days before discharge from the study."