Contractile Dysfunction in Sarcomeric Hypertrophic Cardiomyopathy

David Maciver, Andrew L. Clark

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)

Abstract

The pathophysiological mechanisms underlying the clinical phenotype of sarcomeric hypertrophic cardiomyopathy are controversial. The development of cardiac hypertrophy in hypertension and aortic stenosis is usually described as a compensatory mechanism that normalizes wall stress. We suggest that an important abnormality in hypertrophic cardiomyopathy is reduced contractile stress (the force per unit area) generated by myocardial tissue secondary to abnormalities such as cardiomyocyte disarray. In turn, a progressive deterioration in contractile stress provokes worsening hypertrophy and disarray. A maintained or even exaggerated ejection fraction is explained by the increased end-diastolic wall thickness producing augmented thickening. We propose that the nature of the hemodynamic load in an individual with hypertrophic cardiomyopathy could determine its phenotype. Hypertensive patients with hypertrophic cardiomyopathy are more likely to develop exaggerated concentric hypertrophy; athletic individuals an asymmetric pattern; and inactive individuals a more apical hypertrophy. The development of a left ventricular outflow tract gradient and mitral regurgitation may be explained by differential regional strain resulting in mitral annular rotation.
Original languageEnglish
Pages (from-to)731-737
Number of pages7
JournalJournal of Cardiac Failure
Volume22
Issue number9
Early online date16 May 2016
DOIs
Publication statusPublished - Sep 2016

Keywords

  • Hypertrophic cardiomyopathy
  • left ventricular hypertrophy
  • myocardial strain
  • stress
  • contractility
  • diastolic dysfunction

Fingerprint Dive into the research topics of 'Contractile Dysfunction in Sarcomeric Hypertrophic Cardiomyopathy'. Together they form a unique fingerprint.

Cite this