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A B S T R A C THeart disease in the dog is first described on the basis of the varying clininical syndromes which can occur as a result of cardiac and other lesions. The diagnostic features of the arrhythmias and lesions causing these syndromes are then elaborated with regard to their specific clinical appreciation. Mention is made of the diagnostic information which can be obtained by simple electrocardiography and simple radiology.* This paper formed the basis of a BSAVA contribution at the BVA Congress, Exeter 1972. 553

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<p>The role of epicardial adipose tissue (EAT) in the pathogenesis and prognosis of cardiovascular diseases has been actively discussed. This review provides information regarding the main mechanisms by which EAT influences the pathophysiology of rhythm disturbances, such as atrial fibrillation and ventricular arrhythmias, as well as their relationship with chronic heart failure. The pathogenesis of cardiac arrhythmias is exceedingly complex. As such, the mechanism by which EAT influences arrhythmias and heart failure can vary according to the anatomy and type of arrhythmia, one of which involves the autonomic nervous system (ANS). Some studies have shown a good treatment effects by targeting EAT in atrial fibrillation, whereas others have found that EAT volume can be used to predict the efficacy of radiofrequency ablation, a method for treating atrial fibrillation and ventricular arrhythmias. However, no standards have yet been established for the use of EAT visualisation. Fundamental, translational and clinical research are needed to study the role of EAT and ANS in the pathogenesis of cardiovascular diseases.</p><p>Received 15 March 2021. Revised 25 April 2021. Accepted 26 April 2021.</p><p><strong>Funding:</strong> The work is supported by a grant of the Russian Science Foundation (project No. 17-75-20118).</p><p><strong>Conflict of interest:</strong> The authors declare no conflicts of interests.</p><p><strong>Contribution of the authors</strong><br />Conception and study design: D.V. Losik, N.A. Nikitin, S.M. Minin, A.B. Romanov, A.M. Chernyavskiy<br />Drafting the article: D.V. Losik, I.L. Mikheenko, E.V. Fisher, N.A. Nikitin<br />Critical revision of the article: D.V. Losik, I.L. Mikheenko, E.V. Fisher, N.A. Nikitin<br />Final approval of the version to be published: D.V. Losik, N.A. Nikitin, S.M. Minin, E.V. Fisher, I.L. Mikheenko, A.M. Chernyavskiy, A.B. Romanov</p>