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Clinical and electrocardiographic presentations of transient trifascicular block in three cats
Authors:Eva M Oxford  Flavia B Giacomazzi  N Sydney Moïse  Roberto A Santilli
Institution:Cornell University College of Veterinary Medicine, 930 Campus Road, 14853, Ithaca, NY, USA
Abstract:This report describes transient trifascicular block in three cats presented with lethargy and inappetence, and elevated cardiac troponin I concentrations.The electrocardiogram (ECG) of cat 1 showed a sinus rhythm with pronounced first-degree atrioventricular (AV) block, right bundle branch block, and left anterior fascicular block. The ECG of cat 2 showed truncular left bundle branch block alternating with left anterior fascicular block coupled with prolonged PR intervals, second-degree heart block, and paroxysmal third-degree AV block. The ECG of cat 3 showed first-degree AV block with concomitant right bundle branch block. The diagnosis of trifascicular block was made when paroxysmal third-degree AV block was documented.All cats recovered with medical management within weeks. Each cat resumed a sinus rhythm. Elevated cardiac troponin I concentrations suggested myocarditis that improved.
Keywords:Bundle branch block  Atrioventricular block  Myocarditis  Troponin I
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