Pathology of feline heart diseases.

CHAPTER 1 – The Cardiovascular System

Endomyocardial fibrosis and restrictive cardiomyopathy: pathologic and clinical features.

Indications for permanent pacing in dogs and cats.

The effect of 3rd-degree atrioventricular block on long-term outcome in cats is unknown. Clinical findings and long-term outcome of 21 cats with 3rd-degree atrioventricular block were studied retrospectively. Median age of cats studied was 14 years (range 7-19 years). Presenting signs included respiratory distress or collapse, but 6 cats had no clinical signs of disease. Eight cats had congestive heart failure (CHF) at the time that 3rd-degree atrioventricular block was detected. Heart rates ranged from 80 to 140 beats per minute (bpm; median 120 bpm) with no difference in heart rate between cats with and those without CHF. Eleven of 18 cats that had echocardiograms had structural cardiac disease, and 6 cats had cardiac changes consistent with concurrent systemic disease. No atrioventricular nodal lesions were detected by echocardiography. One cat had atrioventricular nodal lesions detected on histologic examination. Median survival of 14 cats that died or were euthanized was 386 days (range 1-2,013 days). Survival did not differ between cats with or without CHF or between cats with or without structural cardiac disease. Thirteen cats with 3rd-degree atrioventricular block survived > 1 year after diagnosis, regardless of presenting signs or underlying cardiac disease. Third-degree heart block in cats is often not immediately life threatening. Survival was not affected by the presence of underlying heart disease or congestive heart failure at the time of presentation. Even cats with collapse might survive > 1 year without pacemaker implantation.

https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1939-1676.2006.tb02828.x

Third‐Degree Atrioventricular Block in 21 Cats (1997–2004)

Degeneration and fibrosis of the atrioventricular nodal tissue and left bundle branch, associated with cartilage of bone in the central fibrous body and fibrosis of the interventricular septal crest, were observed in 63 cats with cardiomyopathy. The cardiac lesions consisted of endocardial and myocardial fibrosis or organized endomyocarditis. Electrocardiographic, radiographic, angiocardiography, and hemodynamic changes were also observed in the cats.

Lesions of the conduction system in the cat with cardiomyopathy.

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Lesions of the conduction system in the cat with cardiomyopathy.