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Changes from the 1994 AECC definition. the term acute lung injury was abandoned. measurement of the PaO2/FIO2 ratio was changed to require a specific minimum amount of PEEP. 3 categories of ARDS were proposed (mild, moderate, and severe) based on the PaO2/FIO2 ratio. Radiographic criteria were changed to improve interrater reliability.
1 ARDS, or acute respiratory distress syndrome, is a lung condition that leads to low oxygen levels in the blood. 2  ARDS can be life threatening. 3  This is because your body's organs, such as the kidneys and brain, need oxygen-rich blood to work properly.