Table 6.

The Berlin classification of acute respiratory distress syndrome⁽¹⁷³⁾

Criterion	Mild	Moderate	Severe
Timing	Acute onset within one week of a known clinical insult or new or worsening respiratory symptoms
Hypoxemia (PaO2/FlO2)	201-300 with PEEP/CPAP ≥5	101-200 with PEEP ≥5	≤100 with PEEP ≥5
Origin of edema	Respiratory failure not fully explained by cardiac failure orfluid overload
Chest imaging	Bilateral opacities	Bilateral opacities	Bilateral opacities

PaO₂/FIO₂ - relationship between oxygen partial pressure and fraction of inspired oxygen; PEEP - positive end-expiratory pressure; CPAP - continuous positive airway pressure.