We simulated the use of massive volumes of crystalloid fluids as a treatment of
acute plasma loss in a standardized experimental model and studied the factors determining
the retention or excretion of the resulting acute hypoproteinemic fluid overload, its distribution
within the body, and its treatment with concentrated albumin and diuretics. In accordance
with the classic Starling concept, the serum protein level, i.e. the serum colloid osmotic pressure,
determined the excretion/retention ratio of a given water and sodium load. Of the total fluid
retention, fat and muscle each accommodated 25%, whereas the skin, which contributes only
7% to the total body weight, accounted for 37% and increased its volume by roughly one
third. Concentrated albumin promoted fluid excretion in direct proportion to the achieved
increment of the serum protein level and abolished the edema of fat, muscle and skin. Furosemide
was virtually ineffective. The implications of these results for the ‘adult respiratory distress
syndrome’ and disturbed wound healing are discussed and related to the concept of a critical
threshold of the serum protein level.