<prompt> Diagnostic criteria for acute respiratory distress syndrome is: September 2008Pao2Fio2 ratio isPao2Fio2 ratio isPao2Fio2 ratio isPao2Fio2 ratio is  <response>: Ans. B: Pao2Fio2 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 Pao2Fio2 ratio is Acute respiratory distress syndrome is present if Pao2Fio2 ratio ARDS acute respiratory distress syndrome; Pao2 paial pressure of aerial oxygen; Fio2 percentage of inspired oxygen. 