Pulmonary Edema »
What is pulmonary edema?
Edema, in general, means swelling. This typically occurs
when fluid from inside blood vessels seeps outside the blood vessel into the surrounding
tissues, causing swelling. This can happen either because of too much pressure
in the blood vessels or not enough proteins in the bloodstream to hold on to the
fluid in the plasma (the part of the blood that does not contain any blood
cells).
Pulmonary edema is the term used when edema happens in the lungs. The
immediate area outside of the small blood vessels in the lungs is occupied by
very tiny air sacs called the alveoli. This is where oxygen from the air is
picked up by the blood passing by, and carbon dioxide in the blood is passed
into the alveoli to be exhaled out. Alveoli normally have a thin wall that
allows for this air exchange, and fluids are usually kept out of the alveoli
unless these walls lose their integrity.
Picture of the alveoli and lung
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