CXR of a patient with ARDS


ARDS is defined as the as the ratio of partial oxygen tension (PaO2) as
a fraction of inspired oxygen (FiO2) below 200 mmHg in the presence of bilateral alveolar infiltrates
on the CXR.  The infiltrates may appear similar to those of left ventricular failure, but the cardiac
silouette appears normal in ARDS.  Also, the pulmonary capillary wedge pressure is normal (less than
18 mmHg) in ARDS, but raised in left ventricular failure.  PaO2/FiO2 < 300 indicates acute lung injury,
which is considered a precursor to ARDS.

References:
Irwin RS, Rippe JM (2003). Irwin and Rippe's Intensive Care Medicine (5th ed.). Lippincott Williams & Wilkins.
Ashbaugh D, Bigelow D, Petty T, Levine B (1967). "Acute respiratory distress in adults". Lancet 2 (7511): 319–23.

Subpages (1): Ventilator History
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