Multi-Ethnic Study of Atherosclerosis

Multi-Ethnic Study of Atherosclerosis is a landmark, ongoing prospective cohort study initiated in 2000 and sponsored by the National Heart, Lung, and Blood Institute. Its primary aim is to investigate the progression of subclinical atherosclerosis—the buildup of plaque in arteries—and its transition to overt cardiovascular disease in a diverse, community-based population. The research has been instrumental in identifying risk factors, refining predictive models, and understanding disparities in cardiovascular health across different racial and ethnic groups in the United States.

Background and Objectives

The study was launched against a backdrop of recognized limitations in prior cardiovascular research, such as the Framingham Heart Study, which historically involved predominantly White participants. A key objective was to address significant gaps in knowledge regarding the development of coronary artery disease, stroke, and heart failure in multi-ethnic populations. Investigators sought to utilize advanced imaging technologies, including computed tomography and magnetic resonance imaging, to detect early, subclinical disease. The overarching goal was to elucidate the roles of demographic, genetic, biochemical, and psychosocial factors in driving cardiovascular disparities among African Americans, Hispanic and Latino Americans, Chinese Americans, and White Americans.

Study Design and Population

The study employs a longitudinal, observational design, recruiting 6,814 men and women aged 45–84 who were free of clinical cardiovascular disease at baseline in 2000. Participants were enrolled from six field centers across the United States: Forsyth County, Baltimore City, Chicago, Los Angeles County, New York City, and St. Paul, Minnesota. Extensive baseline examinations included measurements of carotid intima-media thickness, coronary artery calcium scoring via electron-beam tomography, and assessment of left ventricular hypertrophy. Follow-up examinations have occurred in multiple waves, with continuous surveillance for clinical events like myocardial infarction and adjudication by committees at the Wake Forest University coordinating center.

Major Findings and Contributions

Research from the study has produced numerous high-impact findings published in journals like the New England Journal of Medicine and Journal of the American Medical Association. Key contributions include establishing the strong predictive value of coronary artery calcium for future cardiac events across all racial groups and highlighting significant ethnic differences in the prevalence and progression of subclinical atherosclerosis. The work has refined risk prediction models, such as the Pooled Cohort Equations, and identified novel risk markers like N-terminal pro b-type natriuretic peptide. Investigations have also linked factors such as air pollution exposure, neighborhood socioeconomic status, and sleep disorders to cardiovascular risk, providing a more holistic understanding of disease etiology.

Data and Biospecimen Access

To maximize its scientific utility, the study operates under a robust data sharing policy. De-identified data from examinations, interviews, and follow-up events are made available to qualified researchers through the National Heart, Lung, and Blood Institute's Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC). This repository also provides access to stored biospecimens, including DNA, serum, and plasma samples. The accessible data have supported hundreds of ancillary studies and collaborations with institutions like the Broad Institute, fueling discoveries in epidemiology, genetics, and public health.

Impact and Legacy

The study has had a profound impact on the field of cardiovascular epidemiology and preventive medicine. Its findings directly inform clinical guidelines from the American Heart Association and the American College of Cardiology on the use of imaging for risk assessment. By rigorously including diverse populations, it has set a new standard for equitable research and provided critical evidence to address health disparities. The extensive, deeply phenotyped cohort continues to serve as a vital resource for investigating aging, dementia, diabetes, and other conditions, ensuring its legacy as a cornerstone of population health science.

Category:Medical research studies Category:Epidemiology Category:Cardiology