Electrical Heterogeneity in Hispanic Background Subpopulations: The HCHS/SOL

Area of Science:

• Cardiology
• Public Health
• Genetics

Background:

• The Hispanic/Latino population exhibits variability in cardiac arrhythmia prevalence and outcomes.
• The underlying reasons for these disparities remain unclear.
• Vectorcardiographic Global Electrical Heterogeneity (GEH) is linked to adverse cardiovascular outcomes.

Purpose of the Study:

• To compare GEH across diverse Hispanic/Latino subpopulations.
• To investigate if ethnicity moderates the association between cardiovascular disease (CVD) and GEH.

Main Methods:

• Cross-sectional analysis of 15,684 participants from the Hispanic Community Health Study/Study of Latinos (HCHS/SOL).
• GEH measured using spatial QRS-T angle, SVG azimuth, elevation, magnitude, and sum absolute QRST integral.
• Linear regression models incorporated interaction terms of ethnic background by CVD, adjusted for numerous covariates.

Main Results:

• Significant differences in GEH measures were observed across ethnic backgrounds (e.g., Dominican, Puerto Rican, South American, Mexican).
• An association between coronary heart disease and GEH was particularly strong in the Cuban subpopulation.
• Specific GEH parameters like spatial QRS-T angle and SVG azimuth showed distinct patterns among subgroups.

Conclusions:

• GEH differences persist among Hispanic/Latino subpopulations even in the absence of CVD.
• Standard cardiovascular risk factors do not fully account for observed GEH variations.
• These findings suggest that unmeasured health disparities contribute to GEH differences across ethnic backgrounds.