Prone Position and Renal Resistive Index

Patients suffering from Acute Respiratory Distress Syndrome (ARDS) with a prone position (PP) indication will benefit from measurements of renal resistive index, intra-abdominal pressure (IAP), urinary oxygen tension (uPO2) and ventilatory mechanics in supine position (baseline IAP), after 2 hours in PP at the current IAP value, thirty minutes after patients' abdomen suspension in order to resume baseline IAP and after patients' are turned back to supine position.