Background: Indices of cardiac mechanics are sensitive markers of subclinical myocardial dysfunction. Improved understanding of the clinical correlates and heritability of cardiac mechanics could result in novel insight into the acquired and genetic risk factors for myocardial dysfunction. Therefore, we sought to determine the clinical correlates and heritability of indices of cardiac mechanics in whites and African Americans (AAs). Methods: We examined 2058 participants stratified by race (1104 whites, 954 AA) in the Hypertension Genetic Epidemiology Network (HyperGEN), a population- and family-based study, and performed digitization of analog echocardiograms with subsequent speckle-tracking analysis. We used linear mixed effects models to determine the clinical correlates of indices of cardiac mechanics (longitudinal, circumferential, radial strain; early diastolic strain rate; and early diastolic tissue velocities). Heritability estimates for cardiac mechanics were calculated using maximum-likelihood variance component analyses in Sequential Oligogenic Linkage Analysis Routine (SOLAR), with adjustment for clinical and echocardiographic covariates. Results: Several clinical characteristics and conventional echocardiographic parameters were found to be associated with speckle-tracking traits of cardiac mechanics. Male sex, blood pressure, and fasting glucose were associated with worse longitudinal strain (LS) (P < 0.05 for all) after multivariable adjustment. After adjustment for covariates, LS, e′ velocity, and early diastolic strain rate were found to be heritable; LS and e′ velocity had higher heritability estimates in AAs compared to whites. Conclusions: Indices of cardiac mechanics are heritable traits even after adjustment for clinical and conventional echocardiographic correlates. These findings provide the basis for future studies of genetic determinants of these traits that may elucidate race-based differences in heart failure development.
|Number of pages||6|
|Journal||International Journal of Cardiology|
|State||Published - Jan 1 2019|
Bibliographical noteFunding Information:
No relationships or disclosures with industry. This study was funded by the National Institutes of Health (NIH) R01 HL107577 and HL127028 (to SJS); HL55673 (to DKA); and HL54471 , HL54472 , HL54473 , HL54495 , HL54496 , HL54497 , HL54509 , and HL54515 (HyperGEN parent study). SJS is also supported by American Heart Association grants 16SFRN28780016 and 15CVGPSD27260148 . SSK is supported by NIH F32 HL129695 and KL2TR001424 .
Research reported in this publication was supported, in part, by the National Institutes of Health's National Center for Advancing Translational Sciences , Grant Number KL2TR001424 (SSK). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
© 2018 Elsevier B.V.
- Cardiac mechanics
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine