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Clinical correlates and heritability of cardiac mechanics: The HyperGEN study. Int J Cardiol 2019 Jan 01;274:208-213

Date

07/27/2018

Pubmed ID

30045819

Pubmed Central ID

PMC6242726

DOI

10.1016/j.ijcard.2018.07.057

Scopus ID

2-s2.0-85050121734 (requires institutional sign-in at Scopus site)   4 Citations

Abstract

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.

Author List

Khan SS, Kim KA, Peng J, Aguilar FG, Selvaraj S, Martinez EE, Baldridge AS, Sha J, Irvin MR, Broeckel U, Arnett DK, Rasmussen-Torvik LJ, Shah SJ

Author

Ulrich Broeckel MD Chief, Center Associate Director, Professor in the Pediatrics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Blood Pressure
Cross-Sectional Studies
Echocardiography, Doppler
Female
Genetic Predisposition to Disease
Heart Ventricles
Humans
Hypertension
Male
Middle Aged
Prevalence
Prognosis
Reproducibility of Results
Signal Processing, Computer-Assisted
Stroke Volume
United States
Ventricular Function, Left