Mechanical ventilation
ARDS
ARDS
Patients were ventilated in the volume assist-control mode (Evita 4 or V500, Dräger, Lübeck, Germany). By default, the tidal volume was set at 6 mL/kg of predicted body weight. PEEP was set by the clinicians in charge, with the goal of keeping the plateau pressure ≤ 30 cmHIn patients with ARDS, at the same day as the PEEP-test, we collected the recruitment-to-inflation (R/I) ratio, an estimate of lung recruitability [