3 years ago

Longitudinal Associations of Pericardial and Intrathoracic Fat with Progression of Coronary Artery Calcium (From the Framingham Heart Study)

Cross-sectional studies have shown that pericardial fat is associated with atherosclerotic burden above and beyond generalized and central adiposity. Whether pericardial fat is longitudinally associated with coronary artery calcium (CAC) has not been firmly established. We examined the associations between cardiac ectopic fat including pericardial and intrathoracic fat with CAC progression and incidence in a community-based study setting. Study participants were from the Framingham Heart Study Offspring and Third Generation Cohorts who underwent multi-detector computed tomography at 2 consecutive examinations (2002-2005 and 2008-2011) for the assessment of CAC. Multivariable-adjusted regression models were used to evaluate the associations between cardiac ectopic fat with CAC. Non-linear associations were also examined. We included 1,732 participants (49.6% women, mean age 49.9 years). Of 1,024 participants with a CAC score=0 at baseline, 197 individuals developed a CAC score>0 (19.2%) during 6.1 years of follow-up. The remaining 708 participants with a CAC score>0 at baseline were eligible for CAC progression analysis. We identified non-linear association between pericardial fat and CAC progression. Higher pericardial fat was associated with higher CAC progression only for those participants with pericardial fat higher than the median value (β=56.0, p=0.04). Intrathoracic fat was linearly associated with CAC progression (β=23.0, p=0.02). However, all of these associations did not persist after additional adjustment for body mass index, abdominal visceral adipose tissue or waist circumference (all p≥0.14). Neither pericardial nor intrathoracic fat were associated with CAC incidence (all p≥0.34). Overall, both of the cardiac ectopic fat measures were longitudinally associated with CAC progression.

Publisher URL: www.sciencedirect.com/science

DOI: S0002914917316132

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