Correction by ECCO2-R of Hypercapnia in Patients With DVP in Moderate to Severe ARDS Under Protective Ventilation.

This is a prospective, non-comparative, open-label, multicenter regional study, without random drawing or blindfolding. The primary objective of the study is the correction by ECCO2-R of hypercapnia in patients with DVP in moderate to severe ARDS under protective ventilation. The primary endpoint is the percentage of patients with hypercapnia correction (defined as a 20% decrease in PaCO2 at H2 of ECCO2-R initiation). The secondary objectives are: * Demonstrate that ECCO2-R allows in hypercapnic ARDS and DVP patients to correct hypercapnia with H6 and H24, improve DVP and hemodynamics, reduce alveolar dead space, improvement of respiratory mechanics * Assess the tolerance of the evaluated technique. The Secondary endpoints are: \- Relative change of capnia to H6 and H24 in relation to H0; proportion of patients with a decrease of at least 20% of PaCO2 to H6 and H24; changes in echocardiographic indices; hemodynamic parameters; alveolar deadspace and respiratory mechanics to H2, H6 and H24, compared to H0; Complications, Mortality at reanimation discharge (or on D28 if this date occurs before discharge of reanimation). The intervention is based on the use of ECCO2-R (PrismaLung®, Prismaflex ® Baxter) in eligible patients. ECCO2-R will be initiated as soon as possible after inclusion, for a duration of at least 24 H (possibly prolonged up to 72 H at the decision of reanimator), by jugular or femoral vein-venous. The size of the catheters, the machine settings, in particular the blood flow and sweep will be standardized according to the state of the art and the recommendations of the manufacturer The ECO2R venous technique uses devices consisting of a monitor, an exchanger and a pump. 1. The PrismaLung® Kit (Baxter): Single-use EC-marked extracorporeal circuit intended for use for at least 24 hours (maximum 72 hours). The PrismaLung® kit is intended for use with the Prismaflex® monitor with software version 8.10 or later and its support in conjunction with Prismaflex® single use treatment sets. 2. The Prismaflex HP-X Set (Baxter): blood line set for extracorporeal blood circulation, EC marked or the HF 1400® set (Baxter) (for extra-corporeal CO2 purification combined with purification). 3. The Prismaflex® monitor (Baxter), EC marked, is used routinely in intensive care (continuous extra-renal purification, therapeutic plasma exchange, haemoperfusion, hemopurification). So that each center has a dedicated monitor for research, this device will be provided by the Baxter laboratory. The monitor will be equipped with a holder for the Prismalung kit marked CE.