Abstract
The study of cardiovascular diseases in small domestic animals is an urgent problem of modern veterinary medi-cine. The research goal is to develop a science-based ap-proach to the clinical picture and risk factors of the emer-genceand development of atrioventricular valve degenera-tion in dogs. The study was conducted in the Department of Biology and Pathology of Small Domestic, Laboratory and Exotic Animals of the Moscow State Academy of Vet-erinary Medicine and Biotechnology named after K.I. Skryabin. The research targets were 162 dogs with myx-omatous degeneration of atriovetricular valves. Myxoma-tous degeneration of the valvular heart apparatus was more often found in dogs of the age of 7 to 10 years -61.7%. The cases were most often diagnosed in dogs of the breeds Chihuahua -29.63%, and Yorkshire Terrier-21%. Of the total number of animals, the disease was more common in males -69.14%. Clinical signs of myxomatous degeneration of the valvular heart apparatus in dogs were diverse. The objective diagnostic clinical signs of myxoma-tous degeneration of the mitral valve of the heart in dogs were the following: cough (53%), sudden lethargy (48%), dyspnea (26%); less frequently -weight loss (12%), loss of consciousness (2.21%) and ascites (0.74%). The main clinical signs of tricuspid valve damage were the following ones: cough (57.14%) and ascites (42.86%). Dyspnea and loss of consciousness were less common (14.29%). With a combined damage of the mitral and tricuspid valves, the clinical picture was more pronounced. The most common symptoms were cough (84.21%), dyspnea (73.68%), and sudden lethargy (63.16%). The clinical substantiation for the development of myxomatous degeneration of the valvu-lar heart apparatus in dogs is the following factors: age, breed and sex of the animal. The clinical signs and differ-ential diagnostic criteria were characterized by polymor-phism and differed in cases of mitral and tricuspid valve lesions and their joint degeneration.
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