Table 1: Diagnostic Criteria for ALI and ARDS [6].

ALI CriteriaARDS Criteria

Acute OnsetAcute Onset
PaO2/FiO2 ≤ 300 mmHg PaO2/FiO2 ≤ 200 mmHg
Chest Radiograph: Bilateral infiltratesChest Radiograph: Bilateral infiltrates
No evidence of left atrial hypertensionNo evidence of left atrial hypertension