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Anterior mitral valve leaflet length in cats with hypertrophic cardiomyopathy

J Seo1, J Novo Matos2, J R Payne3

  • 1Animal Referral Centre, Auckland, New Zealand; School of Veterinary Science, Massey University, Palmerston North, New Zealand; Clinical Science and Services, Royal Veterinary College, Hertfordshire, United Kingdom.

Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology
|October 5, 2021
PubMed

Insights

Elongated anterior mitral valve leaflets (AMVL) in cats predict the development of hypertrophic cardiomyopathy (HCM). This finding suggests AMVL length is a valuable early indicator for feline HCM risk assessment.

Area of Science:

  • Cardiology
  • Veterinary Medicine
  • Genetics

Background:

  • Anterior mitral valve leaflet (AMVL) elongation is a known characteristic of hypertrophic cardiomyopathy (HCM).
  • The predictive value of AMVL elongation for the development of left ventricular hypertrophy in cats remains unclear.
  • This study investigated whether AMVL elongation precedes the onset of HCM in feline populations.

Purpose of the Study:

  • To determine if elongated AMVL in cats is a risk factor for developing HCM.
  • To explore the relationship between baseline AMVL length and the subsequent development of HCM phenotype.
  • To identify potential early diagnostic markers for feline hypertrophic cardiomyopathy.

Main Methods:

  • A retrospective longitudinal study involving 55 apparently healthy cats.
  • Baseline echocardiograms were compared with follow-up echocardiograms obtained over one year.
  • Measurements included AMVL length and left atrial/ventricular dimensions.

Main Results:

  • 17 out of 55 cats (30.9%) developed an HCM phenotype during a median follow-up of 5.4 years.
  • Cats that developed HCM had significantly greater baseline AMVL length (P < 0.0001) and left ventricular wall thickness (P = 0.007).
  • Baseline AMVL length and left ventricular wall thickness were independent predictors of HCM development.

Conclusions:

  • Increased AMVL length at baseline is associated with the subsequent development of left ventricular hypertrophy in cats.
  • AMVL length may serve as a crucial indicator in the natural history of feline HCM.
  • Further research is warranted to explore the clinical utility of AMVL measurements in feline HCM.
Abstract

Keywords:
Dynamic obstructionObstructive cardiomyopathySystolic anterior motion of the mitral valve

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