The most common cause of ARDS is sepsis, a serious and widespread infection of the bloodstream.
Severe illness or injury, however, can cause damage to the membrane, leading to the fluid leakage of ARDS. Normally, a protective membrane keeps this fluid in the vessels. The mechanical cause of ARDS is fluid leaked from the smallest blood vessels in the lungs into the tiny air sacs where blood is oxygenated. The alveoli are surrounded by the alveolar-capillary membrane, which normally prevents liquid in the capillaries from entering the air sacs. Inhaled air passes through tiny ducts from the bronchioles into elastic air sacs (alveoli).
Your bronchioles are some of the smallest airways in your lungs.
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