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Trifascicular block in a cat infected with Cytauxzoon felis
Journal of Veterinary Cardiology  (IF1.701),  Pub Date : 2021-04-02, DOI: 10.1016/j.jvc.2021.03.008
H.W. Jeong, M. Borgarelli

A 3-year-old female spayed indoor/outdoor Siamese cat was diagnosed with cytauxzoonosis and irregular heart rhythm was appreciated during a physical examination. On electrocardiogram, the cat had an average ventricular rate of 144 beats/min with Wenckebach type (Mobitz type I) atrioventricular block. The QRS complexes of sinus conducted beats had left anterior fascicular block morphology, they were followed by two subsequent beats presented with a prolonged P-R interval and QRS conducted with a left bundle branch block. The finding of alternating left anterior fascicular block and left bundle branch block along with atrioventricular block is consistent with trifascicular block. No structural heart changes were noted on echocardiography. Approximately 48 h after presentation to the emergency service, the cat acutely decompensated and spontaneously died.