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Transthoracic Speckle Tracking Echocardiography for the Quantitative Assessment of Left Ventricular Myocardial Deformation
Published on: October 20, 2016
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.
Background:
Tissue Doppler imaging (TDI) of the mitral annulus has been proposed as an alternative for the identification of hypertrophic cardiomyopathy (HCM) genetically affected subjects without left ventricular hypertrophy (G+/LVH-). Unfortunately, conflicting results have been described in the literature, potentially caused by the angle-dependency of TDI. This study sought to assess abnormalities in mitral annular velocities in G+/LVH- subjects as detected by speckle tracking echocardiography (STE).
Methods:
The study population consisted of 23 consecutive genotyped family members without major or minor criteria for the diagnosis of HCM (mean age 37 ± 13 years, 9 men) and 23 healthy volunteers (age 38 ± 12 years, 12 men) who prospectively underwent STE.
Results:
There were no significant differences in global peak systolic annular velocity (7.4 ± 1.2 vs. 7.1 ± 1.0 cm/sec) and early diastolic annular velocity (10.2 ± 2.5 vs. 11.3 ± 2.2 cm/sec) between G+/LVH- and control subjects. Global peak late diastolic annular velocity was higher in G+/LVH- subjects (8.1 ± 1.7 vs. 5.7 ± 1.1 cm/sec, P < 0.001). Regionally, this difference was seen in all 6 studied LV walls.
Conclusions:
This STE study confirms our previous TDI observations on increased peak late diastolic annular velocities in G+/LVH- subjects. Because of the complete overlap in early diastolic annular velocities this parameter cannot be used in the genotypes we studied to differentiate genotype (+) from genotype (-) individuals.
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