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Related Experiment Videos

Supravalvular mitral stenosis in a cat.

Deborah M Fine1, Anthony H Tobias, Kristin A Jacob

  • 1Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul 55108, USA.

Journal of the American Animal Hospital Association
|September 11, 2002
PubMed
Summary

Supravalvular mitral stenosis (SMS) in cats is a rare congenital heart defect characterized by a membrane above the mitral valve. This condition causes respiratory distress and is distinguished from cor triatriatum sinister by the membrane

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Area of Science:

  • Veterinary Cardiology
  • Congenital Heart Disease in Cats
  • Comparative Cardiovascular Pathology

Background:

  • Congenital heart defects can cause significant morbidity in domestic animals.
  • Mitral valve abnormalities, though less common than other cardiac defects, present unique diagnostic challenges.
  • Distinguishing between similar cardiac malformations is crucial for accurate diagnosis and treatment.

Observation:

  • A 3-year-old domestic shorthair cat presented with progressive respiratory distress, pulmonary edema, and pleural effusion.
  • Echocardiography identified a perforate membrane immediately superior to the mitral valve, dividing the left atrium.
  • The left auricle was observed to be proximal to this membrane, connecting to an enlarged proximal left atrial chamber.

Findings:

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  • The echocardiographic findings were consistent with supravalvular mitral stenosis (SMS).
  • The anatomical position of the left auricle relative to the obstructing membrane is key to differentiating SMS from cor triatriatum sinister (CTS).
  • In this case, the proximal positioning of the left auricle confirmed SMS, not CTS.

    • Implications:

    • Accurate differentiation of SMS from CTS is vital for prognosis and potential management strategies.
    • This case highlights the importance of detailed echocardiographic assessment for diagnosing complex congenital heart anomalies.
    • Understanding the specific anatomical variations in feline congenital heart disease aids in veterinary clinical practice and research.