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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 The strict definition of relative atomic mass (Ar) is that it equals the average mass of all the isotopic atoms present in the element compared to 1/12th the mass of a carbon-12 atom (relative isotopic mass of 12.0000).