Association of Estimated Sodium Intake With Adverse Cardiac Structure and Function: From the HyperGEN Study

Senthil Selvaraj*, Luc Djoussé, Frank G. Aguilar, Eva E. Martinez, Vincenzo B. Polsinelli, Marguerite R. Irvin, Donna K. Arnett, Sanjiv J. Shah

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Background The optimal level of sodium intake remains controversial. Objectives This study sought to determine whether examination of left ventricular longitudinal strain (LS), circumferential strain, and e′ velocity can provide insight into thresholds for the detrimental effects of estimated sodium intake (ESI) on subclinical cardiovascular disease. Methods We performed speckle-tracking analysis on HyperGEN (Hypertension Genetic Epidemiology Network) study echocardiograms with available urinary sodium data (N = 2,996). We evaluated the associations among ESI and LS, circumferential strain, and e′ velocity using multivariable-adjusted linear mixed-effects models (to account for relatedness among subjects) with linear splines (spline 1: ESI ≤3.7 g/day, spline 2: ESI >3.7 g/day based on visual inspection of fractional polynomial plots of the association between ESI and indices of strain and e′ velocity). We performed mediation analysis to understand the indirect effects of systolic blood pressure and serum aldosterone on the relationship between ESI and strain and e′ velocity. Results Mean age of participants was 49 ± 14 years, 57% were female, 50% were African American, and 54% had hypertension. The median ESI was 3.73 (interquartile range: 3.24, 4.25) g/day. ESI >3.7 g/day was associated with larger left atrial and left ventricular dimensions (p < 0.05). After adjusting for speckle-tracking analyst, image quality, study site, age, sex, smoking status, alcohol use, daily blocks walked, diuretic use, estimated glomerular filtration rate, left ventricular mass, ejection fraction, and wall motion score index, ESI >3.7 g/day was associated with both strain parameters and e′ velocity (p < 0.05 for all comparisons), but ESI ≤3.7 g/day was not (p > 0.05 for all comparisons). There were significant interactions by potassium excretion for circumferential strain. Mediation analysis suggested that systolic blood pressure explained 14% and 20% of the indirect effects between ESI and LS and e′ velocity, respectively, whereas serum aldosterone explained 19% of the indirect effects between ESI and LS. Conclusions ESI >3.7 g/day is associated with adverse cardiac remodeling and worse systolic strain and diastolic e′ velocity.

Original languageEnglish (US)
Pages (from-to)715-724
Number of pages10
JournalJournal of the American College of Cardiology
Volume70
Issue number6
DOIs
StatePublished - Aug 8 2017

Keywords

  • echocardiography
  • sodium intake
  • strain
  • urinary sodium

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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