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Morphometry of bovine dilated cardiomyopathy
P Nart1, A Williams, H Thompson
1Department of Veterinary Pathology, Institute of Comparative Medicine, Glasgow University Veterinary School, Bearsden Road, Glasgow G61 1QH, UK.
Journal of Comparative Pathology
|April 1, 2004
Summary
Bovine dilated cardiomyopathy (BDCM) in Holstein-Friesian cattle shows increased heart fibrosis and cardiomyocyte size changes. Fibrosis percentage is the key indicator for diagnosing BDCM.
Area of Science:
- Veterinary Pathology
- Cardiovascular Science
- Animal Cardiology
Background:
- Bovine dilated cardiomyopathy (BDCM) is a primary myocardial disease affecting Holstein-Friesian cattle globally.
- Key pathological findings include interstitial fibrosis and variable cardiomyocyte size.
Purpose of the Study:
- To quantitatively assess myocardial changes in BDCM cases compared to controls.
- To identify reliable pathological markers for distinguishing BDCM.
Main Methods:
- Computer-assisted image analysis of heart muscle sections from nine BDCM cases and nine controls.
- Measurement of fibrosis, cardiomyocyte cellular and nuclear dimensions, and nuclear area.
Main Results:
- BDCM hearts exhibited a 6.7-fold increase in connective tissue (fibrosis).
- Cardiomyocyte nuclear and cellular dimensions increased significantly (1.9x and 1.6-1.7x).
- A 51% loss of cardiomyocytes was observed in affected animals, with fibrosis being the most consistent discriminator.
Conclusions:
- Increased myocardial fibrosis is a hallmark of BDCM in cattle.
- Fibrosis percentage serves as a reliable metric to differentiate BDCM from other cardiac conditions in cattle.