On the issue of ECG features in heart pathologies in dogs

The aim of the work is to study the ECG features in dilated cardiomyopathy and mitral valve endocardiosis in dogs. The studies were carried out at the Department of Anatomy and Physiology of the State Agrarian University of the Northern Trans-Urals and in the conditions of veterinary clinics in the city of Tyumen. The subjects of the study were 48 dogs diagnosed with mitral valve endocardiosis and 34 dogs diagnosed with dilated cardiomyopathy. All studied animals underwent electrocardiography with data interpretation using a Cardiomaq veterinary electrocardiograph. In mitral valve endocardiosis, P-mitral was often detected, which was characterized by an increase in the length of the P-wave in the caudal and frontal leads. All this indicates an increase in the left atrium, which often occurs in 2-3 stages of mitral valve endocardiosis. Arrhythmias were also identified, which complicate the course of mitral valve endocardiosis. In dilated cardiomyopathy, the following ECG signs were found: ventricular extrasystoles, premature ventricular contractions with left bundle block morphology, criteria for left ventricular or atrial enlargement. Features of the electrocardiogram in mitral valve endocardiosis were revealed: mitral P, supraventricular tachyarrhythmia, atrial premature complexes, paroxysmal atrial tachycardia, atrial fibrillation, ventricular arrhythmia, P-pulmonary. In dilated cardiomyopathy: ventricular or supraventricular premature beats, ventricular tachycardia (ventricular tachyarrhythmia), criteria for left ventricular or atrial enlargement, left bundle branch block, atrial fibrillation.