<prompt> ARDS true?Type 2 respiratory failureLung compliance decreasedIncrease in diffusion capacitynone  <response>: ARDS is a clinical syndrome of severe dyspnoea of rapid onset, hypoxaemia and diffuse pulmonary infiltrates leading to respiratory failure.ARDS is characterised by Po2Fio2inspiratory O2 fraction200 mmHg.There will be no hypercapnia, so the patient will have type 1 respiratory failure. There will be a stiff-lung syndrome with collapse and decreased compliance of the lungs due to loss of surfactant. 