From Big Medical Encyclopedia

TRANSUDATE (Latin of trans through, through + sudare to exude, filter) — the liquid accumulating in fabric cracks and in perigastriums; on the structure reminds a lymph.

Formation of T. it is most often caused by disturbances of blood circulation, napr, a chronic venous plethora at cardiovascular insufficiency, portal hypertensia (see) various origins with over - inside - or subhepatic blockade of a portal blood-groove, etc. T., accumulating in an abdominal cavity, call ascites (see), in pleural cavities — a hydrothorax (see) 4 in a cavity of a pericardium — a hydrocardia (see).

T. usually happens colourless or pale yellowish and transparent, is more rare slightly rather turbid, e.g. because of impurity from a shelled epithelium, lymphocytes, fat, etc. Specific weight of T. fluctuates within 1,006 — 1,012 while the specific weight of exudate (see) makes 1,018 — 1,020. Protein content in T. usually does not exceed 3%, but can fluctuate over a wide range — from 0,5 to 3%. At nephritic hypostases, e.g., transudate contains a squirrel more than 3% and approaches in this respect exudate. With other things being equal a squirrel in T. the it is more, than term is more from the moment of its education. Proteins T. seralbumin and globulin are, fibrin is more rare. Composition of salts in T. almost same, as in blood serum (see) though considerable fluctuations can be observed. Unlike the exudate containing the enzymes inherent to plasma in T. enzymes ots at tstvo a cosiness. To about l of l oi dn au wasps the spendthrift and che-sky pressure in T. low, therefore a difference between the colloid osmotic pressure of blood and colloid osmotic pressure of T. very big.

To distinguish T. from exudate usually easily, but sometimes distinctions between these two types patol. liquids are erased: T. happens rather turbid, the amount of protein in it increases up to 4 — 5% etc. In such cases studying of all complex clinical, anatomic and bacterial is important. changes (pain, temperature reaction, peristatic hyperemia, hemorrhages, existence of microorganisms in liquid, etc.). On the other hand, often those factors, to-rye have pathogenetic value at hypostases (disturbances of osmotic, oncotic pressure, toxic, developments of stagnation in fabrics), are observed in various degree and at exudation. Besides, T. it is easily infected therefore turns into exudate (transudate-exudate), napr, a hydrothorax pleurisy, ascites peritonitis, etc.

For difference of T. from exudate nek-ry reactions, napr, Rivalta's test (see Rivaljta test) based that weak solution acetic to - you at addition in T are offered. does not lead to its opacification. I. V. Davydovsky.