Patient data and characteristics before ECMO initiation.

Data are median (interquartile range).SOFA, Sequential Organ Failure Assessment; LIS, Murray lung injury score; apH, arterial pH value; PaCO2, partial pressure of arterial carbon dioxide; PaO2/FiO2, ratio of partial pressure of arterial oxygen and fraction of inspired oxygen; PIP, peak inspiratory pressure; PEEP, positive end-expiratory pressure; TV, tidal volume; BMI, body mass index; ARF, acute renal failure.a bacterial, viral, fungal, aspiration pneumonia and H1N1 infection.b other pathologies (eg. pulmonary fibrosis, near drowning, extensive bronchiectasis, pulmonary hemorrhage, tracheal laceration).Patient data and characteristics before ECMO initiation.