Keywords: APACHE-II, acute physiology and chronic health evaluation II; ARDS, acute respiratory distress syndrome; CT, computed tomography; CXRs, chest X-rays; DAD, diffuse alveolar damage; ETI, endotracheal intubation; FiO2, fraction of inspired oxygen; ICU, intensive care unit; PaO2, oxygen pressure; SOFA, sequential organ failure assessment; VA-LRTI, ventilator-associated lower respiratory tract infection; VAP, ventilator-associated pneumonia; VAT, ventilator-associated tracheobronchitis; VILI, ventilator-induced lung injury.