ПАТОМОРФОЛОГІЧНІ ЗМІНИ ЛЕГЕНЕВОЇ ТКАНИНИ ЗА ІНФЕКЦІЙНОГО ПЕРИТОНІТУ КОТІВ

Abstract

The article presents the results of pathoanatomical, pathohistological and histochemical researches of the lung tissue for exudative form of the spontaneous infectious peritonitis of cats. The results of researches allow us to analyze pathoanatomical, microstructural changes in lung tissue of cats in various forms of peritonitis infectious and to define the mechanism of the pathological process that cause lethal consequence.The pathoanatomical research of dead bodies of 4 cats has been carried out: a 3 year–old cat and 1 year and 2 month–old cat and 1 year and 5 month–old with symptoms of exudative pleurisy; a 2 year–old cat with clear signs of exudative peritonitis and pleurisy. Peritoneal fluid and lung tissue fragments for cytological and pathohistological examination were selected. At pathoanatomical autopsy accumulation in the thoracal, abdominal cavities and pericardial space fluid with the flakes of fibrin were revealed, thickening of the serous membranes, layering them fibrin. At the pathohistological research in lung tissue noted the consequences of hemodynamic disturbances in the form of multiple perivascular hemorrhage, interstitial pneumonia, atelectasis and emphysematous cells and signs of fibrinous pleurisy in the state organization have been noted. The hardest changes were developed in the structures of the vascular system and are characterized by the damage of vascular endothelium, the development of productive meso– and periarteritis, syndrome of disseminated intravascular coagulation, stasis and hemolysis of erythrocytes in small vessels of interalveolar septum leading to the oppression of hemocirculation. In lungs, the mononuclear–macrophage infiltration prevailed, especially in periarteritis zone, indicating the presence of productively–necrotic vasculitis.The development of the syndrome disseminated intravascular coagulation led to the formation of multiple micro–blood clots, aggregated cells in vascular channel, the presence of which has led to the development of thrombi and then hemorrhages. The blockade microcirculation, in their turn, led to tissue hypoxia, acidosis and, as a result, distrophic changes in the past. The discovered processes in the vascular system of the lung tissue caused the insufficient flow of blood, irreversible changes of homeostasis and a sharp decline in adaptive capacity.