Diagnostic criteria for acute respiratory distress syndrome is: September 2008

Ans. B: Pao2/Fio2 ratio is Acute Respiratory Distress Syndrome (ARDS) is a syndrome of inflammation and increased permeability associated with a constellation of clinical, radiologic, and physiologic abnormalities unexplained by elevations in left atrial or pulmonary capillary pressure. All definitions of this syndrome include patients who meet the following criteria: Identifiable associated condition Acute onset Pulmonary aery wedge pressure Bilateral infiltrates on chest radiography Acute lung injury (ALI) is present if Pao2/Fio2 ratio is Acute respiratory distress syndrome is present if Pao2/Fio2 ratio ARDS = acute respiratory distress syndrome; Pao2 = paial pressure of aerial oxygen; Fio2 = percentage of inspired oxygen.