Table 1.

The Berlin Criteria defining ARDS9

TimingWithin 1 week of either 1) clinical insult or 2) deterioration in respiratory symptoms
ImagingChest imaging reveals bilateral opacities not fully explained by effusions, lung collapse, nodules
OedemaRespiratory failure not fully explained by pulmonary oedema secondary to cardiac failure
OxygenationMildPaO2/FiO2 ≤39.9 kPa (≤300 mmHg) with PEEP or CPAP ≥5 cmH2O
ModeratePaO2/FiO2 ≤26.6 kPa (≤200 mmHg) with PEEP ≥5 cmH2O
SeverePaO2/FiO2 ≤13.3 kPa (≤100 mmHg) with PEEP ≥5 cmH2O
  • CPAP = continuous positive airway pressure; FiO2 = action of inspired oxygen; PaO2 = partial pressure of arterial oxygen; PEEP = positive end expiratory pressure.