Table 2.
The Berlin definition for clinical diagnosis of acute respiratory distress syndrome
| Variable | Criteria |
|---|---|
| Timing | Within 1 wk of clinical insult or worsening respiratory symptoms |
| Chest imaginga | Bilateral opacities not fully explained by effusion, collapse, or nodules |
| Origin of pulmonary edema | Respiratory failure not fully explained by a cardiac cause or fluid overload |
| Oxygenation | |
| Mild | 200 mm Hg < Pao2/Fio2 ≤ 300 mm Hg with PEEP or CPAP ≥ 5 cm H2O |
| Moderate | 100 mm Hg < Pao2/Fio2 ≤ 200 mm Hg with PEEP ≥ 5 cm H2O |
| Severe | Pao2/Fio2 ≤ 100 mm Hg with PEEP ≥ 5 cm H2O |
Abbreviations: PEEP, positive end-expiratory pressure; CPAP, continuous positive airway pressure.
a
Either chest radiograph or computed tomographic scans could be used for the imaging criteria.