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Respiratory distress syndrome

The respiratory distress syndrome is a condition where there is more fluid than usual in the lungs, so that the normal passage of oxygen into the blood is hindered and the lungs become stiffer.

The fluid in the lungs comes from the blood and may contain the clotting protein fibrinogen, which encourages the lungs’ air sacs (where the oxygen passes from the air into the blood) to collapse, further slowing the flow of oxygen.

The condition is best known in premature babies but can also affect adults.