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Feline cardiomyopathy
Insights
Feline cardiomyopathy, a common heart disease in cats, presents in three pathological forms. This study highlights its similarities to human heart disease, suggesting cats as a valuable animal model for research.
Area of Science:
- Veterinary Cardiology
- Comparative Pathology
- Animal Models in Research
Background:
- Cardiology diagnosis in cats involves multiple methods, including clinical, radiographic, and pathological findings.
- A study analyzed 271 cats with diagnosed heart disease from a larger necropsy population (3,745 cats).
Purpose of the Study:
- To classify feline heart disease based on pathological lesions.
- To investigate the occurrence of thromboembolism in affected cats.
- To postulate a pathogenesis for feline cardiomyopathy and its clinical signs.
Main Methods:
- Diagnosis of cardiology conditions using clinical, radiographic, electrocardiographic, phonocardiographic, angiocardiographic, and pathological assessments.
- Classification of 271 affected cats into three groups based on gross and microscopic pathological lesions.
- Examination of 271 affected cats for the presence of thromboemboli in major arteries.
Main Results:
- Three pathological groups identified: endocarditis/myocarditis (20 cats), endomyocardial fibrosis/left ventricular hypertrophy (182 cats), and myocardial degeneration/biventricular dilatation (69 cats).
- Thromboembolism was observed in 104 of the 271 affected cats across various arteries.
- Reduced diastolic compliance of the left ventricle, leading to poor filling and compensatory left atrial enlargement, is a key aspect of feline cardiomyopathy.
Conclusions:
- Feline cardiomyopathy shares similarities with human cardiomyopathy, making cats a potential animal model for research.
- Stress-induced tachycardia and poor left ventricular filling are postulated as triggers for clinical signs and acute left-sided heart failure.
- Coordinated research programs are needed to further investigate feline cardiomyopathy using diverse approaches.
Abstract:
Cardiology was diagnosed by means of clinical, radiographic, electrocardiographic phonocardiographic, angiocardiographic, and pathological findings in 271 or 3,745 cats necropsied from January 1962 to April 1974. The affected cats can be divided into three groups on the basis of the gross and microscopic pathological lesions: 1)endocarditis and myocarditis in 20 young cats; 2)endomyocardial fibrosis and left ventricular hypertrophy in 182 cats; and 3)myocardial degeneration and biventricular dilatation in 69 cats. Of 271 affected cats, thromboembolus was observed in the aorta, and in the carotid, femoral, iliac, renal, pulmonary, and hepatic arteries in 104 instances. The important aspects of cardiomyopathy in cats appears to be the reduced diastolic compliance of the thick left ventricle, resulting in poor fillin. Resistance to ventricular inflow raises the diastolic pressure and causes compensatory left atrial enlargement. A pathogenesis for the onset of clinical signs at any stages as the cause of the heart disease is postulated on the basis of stress causing tachycardia and poor left ventricular filling. Acute left-sided failure with pulmonary edema may be precipitated. Approximately one-fourth of the cats have enlargement of all cardiac chambers, typical of congestive cardiomyopathy. On the basis of the close similarily to cardiomyopathy in man, the cat could serve as a suitable animal model for a conservation of time and effort in the attack against this disorder. There is a need for coordinated research programs for utilizing the multiple avenues of approach such as: epidemiological, clinical, biochemical, pathological, ultrastructural, virological, and immunological.