1994 consensus conference definition of acute lung injury (ALI) and the acute respiratory distress syndrome (ARDS)
| Onset | • Acute and persistent |
| Oxygenation criteria | • Pao2/Fio2 ≤300 for ALI |
| • Pao2/Fio2 ≤200 for ARDS | |
| Exclusion criteria | • PAOP ≥18 mm Hg |
| • Clinical evidence of left atrial hypertension | |
| Radiographic criteria | • Bilateral opacities consistent with pulmonary oedema |