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Complete heart block associated with lupus in a dog
1University Veterinary Centre Sydney, Faculty of Veterinary Science, The University of Sydney, New South Wales 2006. R.Malik@vetc.usyd.edu.au
Australian Veterinary Journal
|April 16, 2004
Summary
Systemic lupus erythematosus (SLE) in dogs can cause heart block and other autoimmune conditions. Early diagnosis and treatment are crucial for managing this multisystem disease.
Area of Science:
- Veterinary Medicine
- Immunology
- Cardiology
Background:
- Systemic lupus erythematosus (SLE) is a complex autoimmune disease affecting multiple organ systems.
- Heart block, particularly atrioventricular conduction block, can be a serious manifestation in affected animals.
- Multisystemic autoimmune disorders require comprehensive diagnostic approaches.
Observation:
- A 5-year-old Poodle-cross presented with exercise intolerance and chewing difficulties, later developing complete heart block.
- Investigations revealed Coombs-positive immune-mediated hemolytic anemia, masticatory myositis, and hypoadrenocorticism.
- A positive anti-nuclear antibody (ANA) titre supported the diagnosis of SLE.
Findings:
- Immune-mediated destruction of cardiac conduction tissues was implicated as the cause of heart block.
- Glucocorticoid deficiency was successfully managed with cortisone replacement therapy.
- Azathioprine monotherapy controlled SLE for 10 months, but the patient succumbed to subacute bacterial endocarditis.
Implications:
- This case highlights the importance of considering SLE in dogs presenting with heart block.
- Early recognition and management of autoimmune diseases can improve patient outcomes.
- Multisystemic involvement in SLE necessitates a thorough diagnostic workup and tailored treatment strategies.