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Related Experiment Videos

Partial atrioventricular canal defect in a dog.

G Santamarina1, L Espino, M Vila

  • 1Departamento de Patologia Animal, Facultad de Veterinaria, Universidad de Santiago de Compostela, Lugo, Spain.

The Journal of Small Animal Practice
|February 9, 2002
PubMed
Summary
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A partial atrioventricular canal defect in a young English setter showed no clinical signs despite significant heart enlargement and pulmonary overcirculation. This suggests dogs may tolerate this condition and mild mitral regurgitation for years without symptoms.

Area of Science:

  • Veterinary Cardiology
  • Congenital Heart Defects
  • Canine Cardiovascular Research

Background:

  • Partial atrioventricular canal defects are rare congenital heart anomalies.
  • Ostium primum atrial septal defects combined with mitral valve malformations present diagnostic challenges.
  • Assessing hemodynamic consequences in canine congenital heart disease is crucial for prognosis.

Observation:

  • A nine-month-old English setter presented with a large ostium primum atrial septal defect and mitral valve malformation.
  • Electrocardiography and radiography indicated right heart enlargement and pulmonary overcirculation.
  • Echocardiography provided definitive diagnosis and hemodynamic assessment.

Findings:

  • Echocardiography revealed a significant left-to-right intracardiac shunt, quantified by a pulmonary to systemic flow ratio (Qp/Qs) greater than 2.

Related Experiment Videos

  • Despite the large shunt and cardiac enlargement, the dog exhibited no clinical signs.
  • Concurrent mild mitral regurgitation was noted alongside the primary defect.

    • Implications:

    • Canine patients with partial atrioventricular canal defects and mild mitral regurgitation may remain asymptomatic in early life.
    • Early diagnosis via echocardiography is vital for understanding hemodynamic impact.
    • This case highlights the potential for prolonged asymptomatic periods in dogs with specific congenital heart defects, influencing monitoring and treatment strategies.