Water and solute movement in the small intestine of patients with sprue

The Journal of Clinical Investigation
J S FordtranM F Ewton

Abstract

Water and electrolyte movement in the jejunum of normal subjects and patients with sprue was measured during perfusion with isotonic electrolyte solutions. Normal subjects absorbed water, sodium, and potassium. By contrast, in patients with sprue (seven with adult celiac sprue and one with tropical sprue) who had diarrhea and steatorrhea, these substances were secreted into the intestinal lumen. This indicates that the jejunal mucosa of these patients was in a secretory state with respect to water and electrolytes.A method is presented for detecting abnormalities in the effective pore size in disease states. The method is based on the principle of restrictive diffusion and involves measuring the simultaneous diffusion rates of solutes of different molecular size. Since the method does not depend on measurement of water flow in response to osmotic pressure gradients, it can be used in disease states in which absorption and secretory processes involving water may be abnormal.The ratio of urea to tritiated water diffusion in the jejunum of normal subjects averaged 0.8, compared to 0.2 in patients with sprue. This indicates a marked decrease in the effective pore size of the jejunal mucosa in sprue. This conclusion was strengthened...Continue Reading

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