EXUDATE (exsudatum; lat. exsudare to come to light, to be allocated) — the liquid rich with protein and containing uniform elements of blood; it is formed at an inflammation. Process of movement of liquid rich with protein and emigrations of uniform elements of blood from small veins and capillaries in surrounding fabrics and cavities of an organism is called exudation (see). The last arises after damage of cells and fabrics in response to allocation of mediators (see the Inflammation).
Depending on quantitative contents in E. protein and structure of the emigrated cells distinguish serous, purulent, hemorrhagic, fibrinous and mucous exudate. Also mixed forms of exudate meet: mucous and hemorrhagic, serofibrinous and serous and hemorrhagic. Serous E. consists preferential of plasma and a small number of uniform elements of blood. Purulent E. contains the broken-up polymorphonuclear leukocytes, cells of the struck fabric and microorganisms. Hemorrhagic E. it is characterized by considerable impurity of erythrocytes, and fibrinous — the considerable content of fibrin. Mucous E. contains a significant amount of mucin and pseudomucin. Exudate can resolve or be exposed to the organization (see the Organization in pathology).
Bibliography: Davydovsky I. V. General pathology of the person, page 371, M., 1969; The General pathology of the person, under the editorship of A. I. Strukov, etc., page 307, M., 1982; Strukov A. I. and Serov V. V. Pathological anatomy, page 94, M., 1979; Chernukh A. M. Inflammation» M., 1979. See also bibliogr. to St. Inflammation.
G. M. Mogilevsky.