Obi Veterinary Education
Obi Veterinary Education
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Acquired Heart Disease

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  1. Dog Breed Predilictions
  2. Myxomatous Mitral Valve Degeneration
    5 Topics
  3. Cardiomyopathies
  4. Canine Dilated Cardiomyopathy
    5 Topics
  5. Feline Dilated Cardiomyopathy
    5 Topics
  6. Feline Thromboembolic Disease
  7. Feline Hypertrophic Cardiomyopathy
    5 Topics
  8. Feline Restrictive Cardiomyopathy
  9. Other Feline Cardiomyopathies
  10. Feline Hyperthyroidism
    5 Topics
  11. Boxer Cardiomyopathy
  12. Canine Hypertrophic Cardiomyopathy
  13. Pericardial Disorders
  14. Pericardial Effusion
    6 Topics
  15. Constrictive Pericardial Disease
  16. Feline Pericardial Disease
  17. Bacterial Endocarditis
    5 Topics
  18. Canine Heartworm Disease
    6 Topics
  19. Feline Heartworm Disease
  20. Occult Heartworm Disease
    5 Topics

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Acquired Heart Disease Occult Heartworm Disease Diagnosis
Lesson 20, Topic 3
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Diagnosis

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  • Definitive Diagnosis:
    • absence of circulating microfilariae
    • positive immunodiagnostic test
  • Presumptive Diagnosis:
    • absence of circulating microfilariae
    • radiographs supportive of pulmonary artery and pulmonary parenchymal changes due to heartworm
  • Radiography:
    • right ventricular enlargement
    • dilation of the main pulmonary artery
    • enlargement, tortuosity and/or pruning of the pulmonary arteries
    • pulmonary parenchymal changes of an alveolar pattern (coalescent fluffy [patchy] regions adjacent to pulmonary arteries)
    • may see consolidation of lung lobes (so-called pulmonary eosinophilic granulomatosis)
  • Electrocardiography:
    • usually signs of right heart enlargement as described for microfilaremic heartworm disease
  • Blood Work:
    • Hematology: eosinophilia – common; basophilia – common
    • Immunodiagnostics: IFA, ELISA, Agglutination Test

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