Close anatomical and physiological relationships between cardiovascular and respiratory systems and the similarity of clinical symptoms in pathological conditions makes a differential diagnosis very difficult. The doctor's task is establisching which of these two were primary diseases because the way and the effects of therapy are depend on this diagnosis. The aim of the research was the selection of tests which allows us to provide possibly complex diagnostic of cardiovascular and respiratory system in the field. The kind of tests has made following target possible: short time of examination of one horse, relatively small size of piece of equipment, possibly meticulous visualization of the status of cardio-respiratory system, little cost of procedure, prompt available findings, diagnosis and suggestion of therapy. 25 horses of different breeds, sex and age (2-17 years old) have taken as research material. 20 of them were clinically healthy, while 8 had chronic cough. The group of sick horses has been divided into two groups: a group of middle and severe respiratory disorders. Clinical examination has included: temperature, pulse, breath, mucous membrane, lymph nodes, inspection, palpation and auscultation of chest (lungs and heart). Additionally ECG (leads I, II, III, aVR, aVL, aVF, CV1, CV2, CN4), the endoscopic examination of the respiratory tracts, the measurement of gradient of pleural pressure, a volume and respiratory flow have been provided. Each horse in which had been recognized respiratory disorders had respiratory diseases without cardiac failure. Processed algorithm of examination of chronic respiratory disorders of horses consisting of anamnesis, clinical examination, ECG, endiscopic examination and spirometry allow to get complex differential diagnosis of respiratory and cardiological diseases in the field and at the same time it makes to makes diagnosis confident and quick. [References: 7]
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