Left atrial size, atrial function and left ventricular diastolic function in cats with hypertrophic cardiomyopathy

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C J Linney1, J Dukes-McEwan, H M Stephenson

  • 1Department of Cardiology, Small Animal Teaching Hospital, School of Veterinary Science, University of Liverpool, Leahurst, Neston, CH64 7TE.

The Journal of Small Animal Practice
|February 11, 2014
PubMed

Insights

Left atrial volume and function measurements can help assess the severity of hypertrophic cardiomyopathy and congestive heart failure in cats. Reduced left atrial function indicates more severe diastolic dysfunction in cats with heart disease.

Area of Science:

  • Cardiology
  • Veterinary Medicine
  • Echocardiography

Background:

  • Hypertrophic cardiomyopathy (HCM) is a common cardiac disease in cats.
  • Left atrial abnormalities and diastolic dysfunction are often associated with HCM.
  • Assessing left atrial size, volume, and function is crucial for understanding disease severity.

Purpose of the Study:

  • To characterize left atrial size, volume, and function in healthy cats and those with HCM.
  • To evaluate left ventricular diastolic function in these groups.
  • To determine if echocardiographic parameters can differentiate between stages of HCM and heart failure.

Main Methods:

  • Retrospective analysis of echocardiographic data from 61 cats (21 healthy, 21 asymptomatic HCM, 19 HCM with congestive heart failure).
  • Measurements included left atrial diameter, volume, fractional shortening, and ejection fraction.
  • Conventional echocardiographic indices of left ventricular diastolic function were assessed.

Main Results:

  • Cats with HCM and congestive heart failure exhibited significantly larger left atrial dimensions and volumes compared to healthy and asymptomatic HCM cats.
  • Left atrial ejection fraction effectively distinguished between HCM with congestive heart failure and asymptomatic HCM.
  • Reduced mitral A wave velocity and atrial emptying were observed in cats with advanced HCM and heart failure.

Conclusions:

  • Left atrial volume can be reliably measured using echocardiography in cats.
  • Left atrial volume and function serve as indicators of diastolic dysfunction severity in HCM.
  • Reduced left atrial function is associated with more severe HCM and congestive heart failure.
Abstract

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