acute respiratory distress syndrome: a literature review and current updates

acute respiratory distress syndrome (ards) is a complex disorder of heterogeneous etiologies characterized by a consistent, recognizable pattern of lung injury and a potentially devastating form of acute inflammatory lung injury with a high short-term mortality rate and significant long-term consequences among survivors. recently, the new definition of ards has been published, and this definition suggested severity-oriented respiratory treatment by introducing three levels of severity according to pao2/fio2 and positive end-expiratory pressure. supportive care, principally with mechanical ventilation, remains the cornerstone of therapy from maintaining normal physiological parameters to avoiding ventilator-induced lung injury while providing adequate gas exchange. basic elements of this strategy consist of avoiding lung overdistension by limiting tidal volumes and airway pressures, use of peep with or without lung recruitment maneuvers in patients with severe ards. this review focuses on changes in ards definition, epidemiology, clinical and basic research, and current and future directions in treatment.