(Circulation. 2005;111:e124-e133.)
© 2005 American Heart Association, Inc.
AHA Conference Proceedings |
Key Words: AHA Conference Proceedings cardiovascular diseases risk factors epidemiology follow-up studies
| Introduction |
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The present report highlights important findings from several of the key observational studies of CVD, which have examined CVD risk in racial/ethnic minority populations. These key studies include the National Health and Nutrition Examination Survey (NHANES), a US populationbased study; the Honolulu Heart Program (HHP), a study of Japanese-American men; the Strong Heart Study (SHS), a study of American Indians; and the Multi-Ethnic Study of Atherosclerosis (MESA). The studies were selected to represent a variety of racial/ethnic groups and study designs. It should be emphasized that informative data from many other epidemiological observational studies are included; Internet links to additional cohort studies are available in the Appendix. Key references and Internet resources for the lay public and health professionals also are included in the text and the Appendix. Recommendations for future directions and efforts conclude this article.
| Observational Studies |
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The higher incidence of CVD risk factors in racial/ethnic minorities extended to children and young adults 6 to 24 years of age.9 BMI levels were significantly higher for black and Mexican American girls and young women than they were for white girls and young women, with ethnic differences evident by the age of 6 to 9 years (a difference of
0.5 kg/m2 BMI). The differences widened at older ages, with a difference of >2 kg/m2 BMI among 18- to 24-year-olds. Blood pressure levels were higher for black girls than they were for white girls in every age group, and glycosylated hemoglobin levels were highest for black and Mexican American girls and boys in every age group.
The most recent analyses of NHANES data confirm persistent racial/ethnic disparities in CVD risk factors. Flegal et al10 reported alarming increases in the prevalence of obesity from 1999 to 2000 as compared with 1988 to 1994 for all racial/ethnic groups. The racial/ethnic group with the highest risk for obesity was black women
40 years old, among whom >80% were overweight. Although Ford et al11 reported significant decreases in age-adjusted mean total cholesterol concentrations for black men and for Mexican American women, they concluded that serum cholesterol concentrations showed little or no improvement for the overall US adult population.
The data from the NHANES underscore the clustering of CVD risk factors and unhealthful lifestyle factors among racial/ethnic minority populations. Nevertheless, the reasons for the increased burden of risk factors in ethnic/racial minority communities are complex and incompletely understood.12 Moreover, only a few comprehensive studies about how to effectively change risk factor patterns have been conducted in these ethnic minority communities.13,14 Recent work has described how neighborhoods may shape daily experiences, CVD risk factors, and outcomes.15 Both US and international studies have shown that living in a socioeconomically disadvantaged neighborhood is associated with an increased incidence of coronary heart disease (CHD), after adjustment for individual income, education, and occupation.16,17 Other studies have shown that the neighborhood socioeconomic environment is associated with multiple CVD risk factors, including hypertension, cholesterol, dietary habits, smoking, physical inactivity, diabetes, and BMI.1820 The high CVD rates and risk factors among people living in socioeconomically disadvantaged residential environments has a direct bearing on observed disparities in CVD because racial/ethnic minority populations are much more likely than are whites to live in such environments.5,18
Honolulu Heart Program
The HHP was initiated in 1965 to investigate the reasons for reported differences in rates of heart disease and stroke among Japanese men living in Japan, Hawaii, and the US mainland. It had been observed that men of Japanese ancestry residing in the United States appeared to have higher rates of CHD and lower rates of stroke than did their counterparts living in Japan. The HHP studied 8006 men of Japanese ancestry who were 45 to 68 years old in 1965 and lived on the Hawaiian island of Oahu.
The HHP has highlighted the importance of glucose intolerance and diabetes as risk factors for CVD in the Japanese American community. The study investigators observed a continuum of risk by glucose tolerance status, with increasingly unfavorable CVD risk factors as individuals progressed from normal to impaired glucose tolerance to overt diabetes (Table 1).21,22 In addition, glucose intolerance and overt diabetes were risk factors for thromboembolic and hemorrhagic stroke,23 CHD,24 sudden death,25 and all-cause mortality, independent of coexistent risk factors.24
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The HHP cohort study also has drawn attention to the impact of different diabetes criteria on the estimates of the number of people with diabetes in a population. In 1997, the American Diabetes Association (ADA) lowered the cutoff point for fasting glucose from 140 to >126 mg/dL to arrive at the diagnosis of diabetes mellitus and suggested that the oral glucose tolerance test was not needed in epidemiological studies. The World Health Organization (WHO) also lowered the threshold for fasting glucose in 1998, but it maintained the use of the 2-hour postload glucose. When the WHO and ADA criteria for diabetes were applied to the HHP older adult cohort, the investigators observed that 66% of the individuals who had diabetes according to the WHO criteria were missed by the ADA criteria.21 It is anticipated that a substantial increase in diabetes prevalence in the HHP will occur once the new ADA definition is applied.26 Regardless, in HHP data, the relative risks for total and CVD mortality for people with and without diabetes were similar for both definitions of diabetes (Table 2); however, the absolute number of people identified as being at risk was vastly different. When the fasting and postload glucose measures were analyzed as continuous variables, the 2-hour measurement was a superior predictor of total mortality and was independent of fasting glucose. In contrast, fasting glucose was not an independent predictor in the presence of the 2-hour measurement.21
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In addition to underscoring the importance of linking outcome to appropriate definitions of disease, the HHP detected another pathophysiological association in this ethnic population. The investigators reported that the mean BMI of older Japanese men with diabetes, 24 kg/m2, was in the range that is considered normal by anthropometric standards for whites (Table 1).22 The observation that diabetes frequently occurs in the normal weight range (18.5 to 25 kg/m2) in older Japanese men suggests that the BMI thresholds for elevated diabetes risk may be different and need to be revised for different ethnicities, as recommended by the WHO.
Strong Heart Study
Vital event information for CVD among American Indians has traditionally relied on data that were highly flawed because of racial16,17 and event misclassification. For example, people who died from alcohol or ill-defined causes were more likely to be correctly identified as American Indian on their death certificates than were people who died from other causes. Both forms of misclassification led to an underestimation of CVD mortality rates (Figure 3),27 and the inadequate data collection contributed to the erroneous appearance of a CVD mortality advantage for American Indians, despite a well-documented high prevalence of CVD risk factors.28 Moreover, US epidemiological studies rarely included adequate representation of American Indians because of numerous logistic barriers such as a population comprising >500 tribes, a marked heterogeneity of culture and linguistics, and widely dispersed geography.
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The SHS was designed to address the deficiency in data on CVD and its associated risk factors in American Indians.29 Supported since 1988 by the National Heart, Lung, and Blood Institute (NHLBI), the SHS is the largest epidemiological study of American Indians ever undertaken. The SHS includes 13 tribes and communities in 3 culturally and geographically diverse areas of Arizona, North and South Dakota, and Oklahoma, and uses standardized methodology to assess risk factors in longitudinal analyses. The problem of racial misclassification was essentially eliminated by this study.30 The SHS data have demonstrated that American Indian CHD mortality rates either exceed or closely approximate rates in comparable regional populations as well as in the general US and white populations.30 The SHS also provided further evidence of a widening ethnic disparity in CVD burden: Incidence rates of fatal CHD are rising in American Indians31 in contrast to declining rates in the US population overall. The SHS also allows comparisons among the 3 geographic regions, as well as the ability to observe trends through time. For example, incidence rates of nonfatal CHD and stroke were shown to be lower among the male Arizona participants, but the rates of fatal events were similar.
Analysis of SHS data through time reveals that CVD risk factors change in a complex pattern. SHS participants have gradually decreased their total cholesterol levels, improved hypertension treatment rates, and decreased smoking rates; however, hypertension and dyslipidemia, which were once less common among older American Indians, increased in prevalence in the cohort. Furthermore, the cohort experienced increases in an already markedly disproportionate burden of diabetes (Figure 4).32 Although the general US population also is experiencing an increase in diabetes, the diabetes prevalence in the SHS cohort is dramatically higher than it is in the general population.33 Information on the interacting influences of risk factors, especially diabetes, on CVD continues to be gathered,30,31 but overall findings from the SHS portend a continued widening in disparities in CVD.34
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Other important lessons from the SHS include the early involvement of tribal and community members at all stages of the study.35 For example, rumors that DNA samples would be used to prove or disprove an individuals degree of Indian blood, a sensitive and politically charged subject, were allayed by regularly scheduled community meetings. The meetings served to provide and elicit feedback from tribal members, including the manner in which blood samples would be handled according to the tribes beliefs. In addition, all publications relating to the SHS are reviewed not only by the Indian Health Service Institutional Review Boards and the NHLBI but also by the tribes.
Multi-Ethnic Study of Atherosclerosis
Results from epidemiological studies indicate that almost all people who die from CVD have
1 of the major established risk factors, including hypertension, high cholesterol, cigarette smoking, and diabetes36; however, a large proportion of people who do not have symptomatic CVD also have
1 of the CVD risk factors. Scientists have examined the role of noninvasive measures to identify people who have subclinical CVD (ie, people with cardiac or vascular structural abnormalities before the onset of clinical disease) and have studied risk factors associated with the progression of subclinical CVD to the symptomatic state.37 Researchers hypothesize that information on subclinical structural markers may improve the identification of high-risk subgroups for primary and secondary CVD prevention efforts.
Previous studies have demonstrated that measures of subclinical vascular abnormalities are predictive of adverse outcomes. For example, it has long been appreciated that both clinically and noninvasively detected peripheral arterial disease are predictors of CVD death38 and overall mortality.39 What is less well appreciated is that blacks have a high prevalence of peripheral arterial disease.40 In addition, the variation in treatment for peripheral arterial disease is marked. Black patients are more likely to undergo amputation and are less likely to undergo revascularization than are their white counterparts.41
Many questions are unanswered with regard to the epidemiology and prognosis of subclinical disease; data have been collected in many community-based cohorts. The single-site or single-race/ethnicity design of most previous studies limits comparisons across racial/ethnic groups; the observed disparities may be attributable to variation in the performance or measurement of the subclinical disease in different centers as opposed to being attributable to ethnic differences. To address this uncertainty, the current American Heart Association (AHA) guidelines state that more definitive data on the incremental predictive value of subclinical disease measures above that of established CVD risk factors are needed before routine screening can be advocated in asymptomatic individuals.42,43
The need for additional data on multiple measures of subclinical disease provided the motivation for MESA. MESA is the NHLBI-sponsored, multicenter study designed to investigate the prevalence, correlates, and progression of subclinical CVD in multiple ethnicities.37 Six field centers recruited a population-based sample of 6814 men (47%) and women free from symptomatic CVD. The sample was 45 to 84 years old at baseline (2000 to 2002) and from the following groups: white (38%), black (28%), Hispanic American (22%), and Chinese American (12%). The MESA study examines the extent to which ethnic differences exist in the prevalence, amount, and progression of subclinical atherosclerosis. Data have been collected at baseline, and repeat examinations of coronary calcium by electron-beam computed tomography, ultrasound carotid intimal-medial thickness, and ankle-brachial index and a noninvasive measure of endothelial function are scheduled. The study also investigates whether any observed ethnic differences can be correlated to established CVD risk factors or socioeconomic characteristics. Moreover, the MESA study will provide important data on the independent prognostic importance of various forms of subclinical CVD.
The first cycle of the MESA study was recently completed, and most of the published data are in abstract form. Findings to date reveal significant ethnic variation in the prevalence of CVD risk factors and age-adjusted prevalence of coronary artery calcification. One of the first publications on the MESA study revealed that blacks have higher mean maximal thoracic aortic wall thickness as compared with age-controlled whites (3.74 versus 3.42 mm, P=0.02).44
Conclusions From Observational Studies
By consensus, the conference attendees agreed to define a disparity in CVD as a difference that is associated with a disadvantageous or adverse outcome. Therefore, the role of observational studies to delineate risk factor profiles, patterns of care, and outcomes of various groups in our population is critical. Observational studies have the potential to provide a population-based perspective and a sense of the differences in and similarities among these groups. As we seek to achieve a truly equitable US healthcare system, it is imperative that we understand where the needs and results are uneven and what progress is being made. We need to continue making investments into studies of surveillance, with detailed information about patient characteristics that in the past have made some groups vulnerable to second-tier care and an increased risk for adverse outcomes. The summarized observational studies reveal that profound disparities exist in CVD and CVD risk factor prevalence and incidence in the many racial and ethnic minority groups in the United States. The genesis of the disparities in CVD, CVD risk factors, and CVD treatment is still incompletely understood. Such disparities are undoubtedly multifactorial, involving a complex interplay of behavioral, biological, and societal factors.
Many methodological challenges remain in undertaking observational studies in different racial/ethnic groups. No uniform standards exist for identifying race/ethnicity in an increasingly multicultural US society. Many individuals identify with multiple racial/ethnic groups, and most studies have used participant-identified racial/ethnic categories. Whereas self-identification with multiple ethnicities is undoubtedly more accurate, definitions need to be standardized or tailored to the appropriate populations. The issue of analyzing subgroups highlights another challenge in observational study design. If studies aim for representative numbers of racial/ethnic groups, then most will be underpowered to make inferences about differences among various groups. Alternatively, because of the inherent variation in data collection across sites and studies, large studies of single racial/ethnic groups may compromise the ability to make cross-racial/ethnic comparisons. An additional methodological issue is that although epidemiological studies have effectively measured many biological risk factors, the techniques for assessing behavioral, psychosocial, SES, and community factors have been less thoroughly developed and standardized. The challenge remains to precisely measure and quantify the influences of social, economic, political, and other potentially substantive forces. Moreover, most epidemiological studies have not carefully analyzed and accounted for the influence of socioeconomic, neighborhood, and community factors. Hence, marked racial/ethnic disparities in CVD, health behaviors, and risk factors almost certainly are confounded by SES and community factors. Incomplete analysis of such factors may have the effect of overestimating risk for racial/ethnic minority populations and underestimating the risk of low SES white populations.
Future studies need to determine more precisely the contribution of SES to ethnic disparities in CVD. As in all studies of racial/ethnic disparities, residual confounding by SES is likely in the studies reviewed.45 Thus, it is possible that the racial/ethnic disparities would be reduced if more comprehensive measures of SES had been available (ie, accumulated assets, quality of schooling, occupational status, neighborhood factors). The existence of residual confounding by SES, however, does not render race/ethnicity any less important because certain ethnic/racial groups disproportionately bear the burden of low SES. Rather, the identification of the role of SES may inform interventions to diminish ethnic/racial disparities in CVD.
Future studies also need to expand the focus from the individual to include factors in communities that may influence health behaviors and risk factors related to CVD. Knowledge about the communities in which people live can provide health professionals with valuable insights about how residential environments can influence behaviors and health.5,16,46,47 For example, ethnic/racial minority populations may encounter significant barriers to adopting and maintaining healthy behaviors (eg, few or no grocery stores with affordable fresh produce, few or no pharmacies, few safe places to exercise, limited public transportation, poor access to health care, targeted tobacco advertising and promotions). In addition, ethnic/racial minority populations may be more likely than whites to be exposed to hazardous environments (eg, crime, poor air quality) that in turn influence health behaviors and risk factors. In response to such inequalities, health professionals can be important advocates in promoting healthy schools, neighborhoods, and communities. Two crucial strategies likely to reduce ethnic disparities in CVD are an approach tailored to a high-risk subgroup and an approach that is geared toward the population as a whole.48
| Recommendations |
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| Appendix |
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Clinical Trials
Observational Studies
Health Disparities Information
Genetics
Risk Factors
Risk Assessment
Organizations and Programs
| Footnotes |
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A single reprint is available by calling 800-242-8721 (US only) or by writing the American Heart Association, Public Information, 7272 Greenville Ave, Dallas, TX 75231-4596. Ask for reprint no. 71-0316. To purchase additional reprints: up to 999 copies, call 800-611-6083 (US only) or fax 413-665-2671; 1000 or more copies, call 410-528-4121, fax 410-528-4264, or e-mail kgray@lww.com. To make photocopies for personal or educational use, call the Copyright Clearance Center, 978-750-8400.
The Executive Summary and reports of the Basic Science, the Obesity, and the Advocacy Writing Groups are available online at http://www.circulationaha.org (Circulation. 2005;111:13391349; e120e123; e134e139; and e140e148).
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