As 2010 draws to a close, it is evident that despite great strides toward the Healthy People 2010 objective to eliminate racial disparities in health, we have fallen short of achieving our goal for coronary heart disease (CHD). In part, progress has been hampered by the need to rely on the Atherosclerosis Risk in Communities (ARIC) study for incidence rates, a study which recruited participants >20 years ago. These data may not be helpful in answering why Black-White disparities for coronary heart disease (CHD) mortality may be widening. Furthermore, Blacks enrolled in ARIC were recruited primarily from a single community in a high CHD mortality region. Similar to the more widely recognized Stroke Belt, US county level CHD mortality varies as much as 10 fold;the ARIC study cannot examine regional differences. As a result, we still do not know why Blacks have lower myocardial infarction (MI) incidence yet higher CHD mortality than Whites. The REasons for Geographic And Racial Differences in Stroke Study is generating data needed to study racial and regional differences in acute CHD. This prospective cohort, recruited from 2003-7, includes 30,239 community dwellers age >45 years at baseline residing in the 48 contiguous US states, with 42% Blacks (n=12,490) and 55% women (n=16,612). Rich baseline data include medical history, functional status, health behaviors, psychosocial measures, physiologic measures (BP, height and weight), blood and urine biomarkers (e.g., cholesterol, albuminuria, CRP) and ECGs. Our preliminary data from REGARDS-MI-1 reveal smaller Black-White CHD incidence differences for participants age <65 years compared with those age >65 years. Furthermore, in follow-up conducted to date, nonfatal acute MI incidence rates are highest in high CHD mortality regions for Whites, but not for Blacks. Together, these findings suggest that racial differences in incidence in the ARIC study may not be generalizable. The number of CHD events currently available (352 definite/probable MI, 187 CHD deaths) is insufficient to examine the reasons underlying these provocative early findings. We now seek funding to extend follow-up, aiming to: 1. To estimate region and race-specific rates of definite or probable MI, acute CHD mortality, including in- and out-of-hospital deaths, and sudden death. H1. Acute nonfatal MI incidence for Blacks and Whites is similar for those age <65 years, but lower for Blacks versus Whites age >65 years. H2. Acute nonfatal MI incidence varies by region and is highest in high CHD mortality regions for Whites, but not Blacks. H3. Acute CHD mortality is higher for Blacks than Whites overall, and across all CHD mortality regions. 2. To identify potential explanatory factors for racial difference in nonfatal and fatal CHD. H1. Traditional Framingham Heart Study (FHS) CHD risk factors, non-FHS CHD risk factors, CHD preventive practices (AHA's "Life's Simple 7") and CHD preventive services differ between Whites and Blacks, in part explaining higher CHD mortality in Blacks. Exploratory H2. Susceptibility to some CHD risk factors differs for Blacks and Whites in part explaining higher White CHD incidence and higher Black CHD mortality.

Public Health Relevance

We will extend the REGARDS-MI study for another 5 years to answer important questions about racial and regional differences in heart attack. This ancillary study to a much larger study following over 30,000 Blacks and Whites over time seeks to understand why Blacks have higher death from coronary heart disease than Whites do, and why residents of some areas of the country have higher coronary heart disease death rates than residents of other areas.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL080477-08
Application #
8511778
Study Section
Cardiovascular and Sleep Epidemiology (CASE)
Program Officer
Aviles-Santa, Larissa
Project Start
2005-04-01
Project End
2016-07-31
Budget Start
2013-08-01
Budget End
2014-07-31
Support Year
8
Fiscal Year
2013
Total Cost
$835,279
Indirect Cost
$265,123
Name
University of Alabama Birmingham
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
063690705
City
Birmingham
State
AL
Country
United States
Zip Code
35294
Colantonio, Lisandro D; Gamboa, Christopher M; Kleindorfer, Dawn O et al. (2016) Stroke symptoms and risk for incident coronary heart disease in the REasons for Geographic And Racial Differences in Stroke (REGARDS) study. Int J Cardiol 220:122-8
Thacker, Evan L; Soliman, Elsayed Z; Pulley, LeaVonne et al. (2016) Investigation of selection bias in the association of race with prevalent atrial fibrillation in a national cohort study: REasons for Geographic And Racial Differences in Stroke (REGARDS). Ann Epidemiol 26:534-9
Mondesir, Favel L; Brown, Todd M; Muntner, Paul et al. (2016) Diabetes, diabetes severity, and coronary heart disease risk equivalence: REasons for Geographic and Racial Differences in Stroke (REGARDS). Am Heart J 181:43-51
Booth 3rd, John N; Muntner, Paul; Diaz, Keith M et al. (2016) Evaluation of Criteria to Detect Masked Hypertension. J Clin Hypertens (Greenwich) 18:1086-1094
Ghazi, Lama; Safford, Monika M; Khodneva, Yulia et al. (2016) Gender, race, age, and regional differences in the association of pulse pressure with atrial fibrillation: the Reasons for Geographic and Racial Differences in Stroke study. J Am Soc Hypertens 10:625-632.e1
Bhatt, Hemal; Gamboa, Christopher M; Safford, Monika M et al. (2016) Prevalence of electrocardiographic abnormalities based on hypertension severity and blood pressure levels: the Reasons for Geographic and Racial Differences in Stroke study. J Am Soc Hypertens 10:702-713.e4
Xie, Fenglong; Colantonio, Lisandro D; Curtis, Jeffrey R et al. (2016) Linkage of a Population-Based Cohort With Primary Data Collection to Medicare Claims: The Reasons for Geographic and Racial Differences in Stroke Study. Am J Epidemiol 184:532-544
Moise, Nathalie; Khodneva, Yulia; Richman, Joshua et al. (2016) Elucidating the Association Between Depressive Symptoms, Coronary Heart Disease, and Stroke in Black and White Adults: The REasons for Geographic And Racial Differences in Stroke (REGARDS) Study. J Am Heart Assoc 5:
Hansen, Richard A; Khodneva, Yulia; Glasser, Stephen P et al. (2016) Antidepressant Medication Use and Its Association With Cardiovascular Disease and All-Cause Mortality in the Reasons for Geographic and Racial Differences in Stroke (REGARDS) Study. Ann Pharmacother 50:253-61
Colantonio, Lisandro D; Kent, Shia T; Kilgore, Meredith L et al. (2016) Agreement between Medicare pharmacy claims, self-report, and medication inventory for assessing lipid-lowering medication use. Pharmacoepidemiol Drug Saf 25:827-35

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