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Table 1 Definition of ARDS

From: Therapeutic iloprost for the treatment of acute respiratory distress syndrome (ARDS) (the ThIlo trial): a prospective, randomized, multicenter phase II study

Mild ARDSModerate ARDSSevere ARDS
200 mmHg < PaO2/FiO2 ≤ 300 mmHg
PEEP ≥5 cmH2O
100 mmHg < PaO2/FiO2 ≤ 200 mmHg
PEEP ≥5 cmH2O
PaO2/FiO2 ≤ 100 mmHg
PEEP ≥5 cmH2O