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Acquired mitral stenosis in a cat with hypertrophic cardiomyopathy

Naoyuki Takemura1, Kiyoshi Nakagawa, Noboru Machida

  • 1Department of Veterinary Internal Medicine, Nippon Veterinary and Animal Science University, Musashino City, Tokyo, Japan.

The Journal of Veterinary Medical Science
|December 11, 2003
PubMed

Insights

This case study reveals that acquired mitral stenosis (MS) can develop alongside hypertrophic cardiomyopathy (HCM) in cats. Post-mortem examination confirmed fibrous tissue fusion causing MS in a cat with HCM.

Area of Science:

  • Veterinary Cardiology
  • Comparative Pathology

Background:

  • Hypertrophic cardiomyopathy (HCM) is a common cardiac disease in cats.
  • Mitral stenosis (MS) is a less common valvular heart disease, often congenital or secondary to other conditions.

Observation:

  • A seven-year-old domestic shorthair cat presented with clinical signs suggestive of HCM and MS.
  • Diagnostic imaging, including echocardiography, supported the initial diagnosis.
  • Post-mortem examination revealed severe fibrous thickening and fusion of the chordae tendineae and mitral valve commissures.

Findings:

  • The cat exhibited morphological changes consistent with HCM.
  • Significant fibrous deposition led to complete chordal fusion, creating a restrictive inflow obstruction characteristic of acquired MS.
  • This case demonstrates a unique pathological progression of acquired MS in conjunction with feline HCM.

Implications:

  • This finding expands the understanding of potential complications associated with feline HCM.
  • It highlights the importance of considering acquired MS in cats diagnosed with or suspected of having HCM.
  • Further research into the mechanisms and prevalence of acquired MS in HCM cases is warranted.

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