Only two randomized controlled double-blinded trials assessed the use of corticosteroids for persistent ARDS. In 24 patients, Meduri et al. reported an improvement of lung function and survival (1). In 180 patients, Steinberg et al showed no effect of corticosteroids on survival (2). A lower risk of death was observed when corticosteroids were started before 14 days after the onset of ARDS (2).