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Table 2 Clinical definition of acute respiratory distress syndrome and acute lung injury [76]

From: Science review: Mechanisms of ventilator-induced injury

Clinical feature

Acute respiratory distress syndrome

Acute lung injury

Timing

Acute onset

Same

Chest radiograph

Bilateral infiltrates

Same

Exclusion of alternative diagnosis

Pulmonary artery wedge pressure ≤ 18 mmHg OR absence of clinical evidence for left atrial hypertension

Same

Oxygenation

PaO2 : FiO2 ratio ≤ 200

PaO2 : FiO2 ratio ≤ 300

  1. PaO2 : FiO2, ratio of arterial partial pressure for oxygen to the fraction of oxygen in the inspired air.