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Hypertrophic cardiomyopathy secondary to severe right and left ventricular outflow tract obstruction in a Maltese dog

  • Yoon, Won-Kyoung (Guardian Angel Animal Hospital) ;
  • Suh, Sang-Il (Section of Small Animal Internal Medicine, College of Veterinary Medicine, Kangwon National University) ;
  • Oh, Yeon-Su (Department of Veterinary Pathology, College of Veterinary Medicine, Kangwon National University) ;
  • Hyun, Changbaig (Section of Small Animal Internal Medicine, College of Veterinary Medicine, Kangwon National University)
  • Received : 2015.06.01
  • Accepted : 2015.08.12
  • Published : 2015.09.30

Abstract

An 8-year-old spayed female Maltese (2.5 kg of body weight) presented with the primary complaint of loud heart murmur and exercise intolerance. Diagnostic imaging revealed severe pulmonic stenosis (peak velocity 5.2 m/s) with right ventricular hypertrophy. The dog revisited after 2 years, at which time, diagnostic imaging revealed severe biventricular hypertrophy, dynamic left ventricular outflow tract obstruction, left atrial dilation and pulmonary hypertension with worsened pre-existing pulmonic stenosis. Postmortem investigation revealed hypertrophic cardiomyopathy and regional myocardial infarction. The case was diagnosed as hypertrophic cardiomyopathy secondary to severe right and left ventricular outflow tract obstruction.

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