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An Image Guided Transapical Mitral Valve Leaflet Puncture Model of Controlled Volume Overload from Mitral Regurgitation in the Rat
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An Image Guided Transapical Mitral Valve Leaflet Puncture Model of Controlled Volume Overload from Mitral Regurgitation in the Rat

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The mitral valve in hypertrophic cardiomyopathy: old versus new concepts

Albert A Hagège1, Patrick Bruneval, Robert A Levine

  • 1Assistance Publique-Hôpitaux de Paris, Hôpital Européen Georges Pompidou, Department of Cardiology, Paris, France. albert.hagege@egp.aphp.fr

Journal of Cardiovascular Translational Research
|September 13, 2011
PubMed

Insights

Mitral valve (MV) enlargement in hypertrophic cardiomyopathy (HCM) is poorly understood. Research suggests it may be an intrinsic aspect of HCM or a reactive process, impacting treatment strategies.

Area of Science:

  • Cardiology
  • Cardiovascular Research
  • Genetic Cardiology

Background:

  • Elongation and pathological thickening of the mitral valve (MV) are common in hypertrophic cardiomyopathy (HCM).
  • Associated features include papillary muscle malpositioning, systolic anterior motion (SAM) of MV leaflets, and worsening left ventricular outflow tract (LVOT) obstruction.
  • Impaired MV leaflet coaptation can lead to mitral regurgitation or exacerbated LVOT obstruction.

Purpose of the Study:

  • To investigate the poorly understood pathogenic basis of mitral valve enlargement in hypertrophic cardiomyopathy.
  • To explore potential intrinsic and reactive mechanisms contributing to MV abnormalities in HCM.
  • To identify adaptive mechanisms for targeted prevention and treatment of MV disease in HCM.

Main Methods:

  • Review of existing literature on mitral valve morphology and function in HCM.
  • Analysis of clinical observations linking MV changes to HCM severity and genetic factors.
  • Exploration of hypotheses including intrinsic genetic predisposition and reactive myocardial signaling pathways.

Main Results:

  • The precise cause of MV enlargement in HCM remains unclear.
  • Lack of correlation between MV size and left ventricular hypertrophy severity suggests an intrinsic HCM component.
  • Early findings in individuals with sarcomere mutations point towards a potential genetic basis.
  • Evidence also suggests a reactive process involving paracrine growth factors influencing valve overgrowth.

Conclusions:

  • Mitral valve enlargement in HCM may stem from intrinsic genetic factors or reactive myocardial processes.
  • Understanding these mechanisms is crucial for developing targeted therapies.
  • Further research into adaptive mechanisms is needed for effective prevention and treatment of MV disease in HCM.

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