Diastolic abnormalities in normal phenotype hypertrophic cardiomyopathy gene carriers: a study using speckle tracking

Floris Kauer1, Bas M van Dalen, Michelle Michels

  • 1Department of Cardiology, The Thoraxcenter, Erasmus University Medical Center, Rotterdam, The Netherlands.

Insights

Speckle tracking echocardiography (STE) reveals increased late diastolic mitral annular velocities in genetically affected hypertrophic cardiomyopathy (HCM) subjects without left ventricular hypertrophy. Early diastolic velocities did not differentiate these individuals from controls.

Area of Science:

  • Cardiology
  • Echocardiography
  • Genetics

Background:

  • Tissue Doppler imaging (TDI) for hypertrophic cardiomyopathy (HCM) identification has limitations due to angle-dependency.
  • Speckle tracking echocardiography (STE) offers an alternative for assessing mitral annular velocities.

Purpose of the Study:

  • To evaluate mitral annular velocity abnormalities in genotype-positive, left ventricular hypertrophy-negative (G+/LVH-) HCM subjects using STE.
  • To determine if STE can differentiate G+/LVH- individuals from healthy controls.

Main Methods:

  • Prospective study involving 23 G+/LVH- subjects and 23 healthy controls.
  • All participants underwent STE to assess mitral annular velocities.

Main Results:

  • No significant differences in global peak systolic or early diastolic annular velocities between G+/LVH- and control groups.
  • Global peak late diastolic annular velocity was significantly higher in G+/LVH- subjects compared to controls (P < 0.001).
  • This increase in late diastolic velocity was observed across all six left ventricular walls.

Conclusions:

  • STE confirms increased peak late diastolic annular velocities in G+/LVH- subjects, consistent with prior TDI findings.
  • Early diastolic annular velocities lack the discriminatory power to differentiate G+/LVH- individuals from controls in this cohort.
Abstract

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