The new 2012 definition for Acute Respiratory Distress Syndrome (ARDS) (published in JAMA June 2012)
According to the previous definition published in 1994 by the American-European Consensus Conference (AECC), ARDS must have the following 4 criteria:
the onset must be acute
there must be hypoxemia with PaO2/FIO2 ratio ≤ 200
there must be bilateral infiltrates on CXR
these findings cannot be