martes, 13 de septiembre de 2011

Million Hearts: Strategies to Reduce the Prevalence of Leading Cardiovascular Disease Risk Factors --- United States, 2011

Early Release
September 13, 2011 / 60(Early Release);1-4

Cardiovascular disease (CVD) causes one in three (approximately 800,000) deaths reported each year in the United States (1). Annual direct and overall costs resulting from CVD are estimated at $273 billion and $444 billion, respectively (2). Strategies that address leading CVD risk factors, such as hypertension, high cholesterol levels, and smoking, can greatly reduce the burden of CVD (3). To estimate the U.S. prevalence of these three risk factors, CDC analyzed data from the National Health and Nutrition Examination Survey (NHANES) on uncontrolled hypertension, uncontrolled high levels of low-density lipoprotein cholesterol (LDL-C), and current smoking. This report summarizes the results of that analysis, which found that 49.7% of U.S. adults aged ≥20 years (an estimated 107.3 million persons) have at least one of the three risk factors. To reduce the prevalence of CVD risk factors among persons in the United States, the U.S. Department of Health and Human Services, in collaboration with nonprofit and private organizations, is launching Million Hearts, a multifaceted combination of evidence-based interventions and strategies aimed at preventing 1 million heart attacks and strokes over the next 5 years.
NHANES is a complex, multistage probability sample of the civilian, noninstitutionalized U.S. population that combines interviews and physical examinations.* Data from 2007--2008, the most recent NHANES survey data available, were used to estimate the current U.S. prevalence of uncontrolled hypertension, uncontrolled high levels of LDL-C, and current smoking among adults aged ≥20 years; five NHANES survey cycles (1999--2000, 2001--2002, 2003--2004, 2005--2006, and 2007--2008) were analyzed to examine changes in prevalence over time. Examination participation rates for the five cycles ranged from 75% to 80%. During 1999--2008, a total of 24,693 persons aged ≥20 years were interviewed and examined for NHANES. From that total, 1,154 pregnant women were excluded. Of the 23,539 remaining adults, 9,891 had been randomly assigned to a morning examination and had fasted for 8--24 hours. Of the 9,891 examined, 790 with missing blood pressure or LDL-C measurements were excluded (none were missing smoking status), yielding a final sample of 9,101.
Uncontrolled hypertension was defined as a systolic blood pressure ≥140 mm Hg or a diastolic blood pressure ≥90 mm Hg, based on the average of up to three measurements.† Uncontrolled high levels of LDL-C were defined as levels above the treatment goals established by the National Cholesterol Education Program (NCEP) Adult Treatment Panel-III (ATP-III) guidelines: <160 mg/dL, <130 mg/dL, and <100 mg/dL for low-, intermediate-, and high-risk groups, respectively.§ LDL-C was used because it is identified by NCEP as the primary target for lipid-lowering therapy. Current cigarette smoking was defined in persons who 1) reported having smoked ≥100 cigarettes in their lifetime and who currently smoke every day or some days, or 2) had a measured serum cotinine (the primary nicotine metabolite) level >10 ng/mL.
All analyses were conducted using statistical software to account for the complex sampling design and to calculate prevalence estimates and 95% confidence intervals (CIs). The estimated number of persons with at least one of the three CVD risk factors was derived from Current Population Surveys, based on weighted, unstandardized prevalence estimates.
In 2007--2008, among U.S. adults aged ≥20 years, an estimated 49.7% (CI = 46.4%--53.0%) had at least one of the following CVD risk factors: uncontrolled hypertension, uncontrolled high levels of LDL-C, or current smoking. That prevalence represented an estimated 107.3 million (CI = 99.9--114.8) persons aged ≥20 years. Of the 107.3 million persons, an estimated 21.3% had two of the three risk factors, and 2.4% had all three. After adjusting for sex, age group, race/ethnicity, and poverty-income ratio, a significant decline in prevalence, from 57.8% (CI = 52.9%--62.5%) to 49.7%, was observed from 1999--2000 to 2007--2008 (p<0.01 for linear trend). However, because of U.S. population growth, the number of persons represented by thosee prevalences did not change significantly (109 million versus 107 million) (Figure).

Reported by

Amy L. Valderrama, PhD, Fleetwood Loustalot, PhD, Cathleen Gillespie, MS, Mary G. George, MD, Michael Schooley, MPH, Div for Heart Disease and Stroke Prevention, Peter Briss, MD, Office of the Director, Shanta Dube, PhD, Ahmed Jamal, MBBS, MPH, Office on Smoking and Health, National Center for Chronic Disease Prevention and Health Promotion; Paula W. Yoon, ScD, Epidemiology and Analysis Program Office, Office of Surveillance, Epidemiology, and Laboratory Svcs, CDC. Corresponding contributor: Amy L. Valderrama, avalderrama@cdc.gov, 770-488-8218.

Editorial Note

The decrease in the prevalence of U.S. adults aged ≥20 years with uncontrolled hypertension, uncontrolled high levels of LDL-C, or current smoking might, in part, reflect improved treatment and control of hypertension and high levels of LDL-C (4,5) and implementation of effective smoking interventions, such as smokefree policies for public places, increased cigarette excise taxes, and cessation treatments and services (6). Nevertheless, approximately half of the U.S. adult population still has one or more of these preventable risk factors for CVD.
Optimal prevention of CVD will require complementary clinical and community efforts and monitoring of interventions, risk factors, and disease at individual and population levels. Although safe, feasible, and effective clinical preventive services are available that can substantially reduce cardiovascular morbidity and mortality (e.g., the ABCS: aspirin therapy, blood pressure control, cholesterol management, and smoking cessation), these basic preventive and control measures are underprovided and underused (Table). Community interventions also could be enhanced. The prevention, treatment, and control of CVD are influenced by a wide range of diverse community and clinical factors (2,3). Approximately 90% of persons in the United States consume sodium at levels above those recommended in dietary guidelines (7), trans fat remains an avoidable hazard in restaurant and processed food, and approximately one in five adults currently smoke (8). In addition, funding of state tobacco control programs is significantly below levels recommended by CDC (6). Communitywide changes and policies addressing these issues have the potential to reduce CVD and have a substantial positive impact on the health of the public.
The findings in the report are subject to at least one limitation. NHANES only surveys the noninstitutionalized U.S. population and does not include military personnel and persons who reside in nursing homes and other institutions. The prevalence of the three CVD risk factors might be underestimated because older persons living in nursing homes and other institutions might be more likely to have age-related hypertension and high levels of LDL-C (1).
To reduce the burden of CVD risk factors, the U.S. Department of Health and Human Services, in collaboration with nonprofit and private organizations, is launching Million Hearts, with the goal of preventing 1 million heart attacks and strokes over the next 5 years. Million Hearts is expected to align policies, programs, and resources to improve access to care; focus attention on improved care through use of the ABCS and health information technology; increase public awareness about risk factors; improve medication adherence; promote healthier behaviors and environments; and enhance surveillance and monitoring.
Million Hearts incorporates technological advances occurring in the clinical setting (e.g., health information technology development and linkages with electronic medical records), modifications in health-care coverage and reimbursement (e.g., Physician Quality Reporting System and increased coverage of clinical preventive services), and comprehensive environmental and policy initiatives (e.g., Community Transformation Grants) that are under way at worksites and in communities.Million Hearts draws upon the extensive evidence base of established standards in clinical (e.g., U.S. Preventive Services Task Force) and community (e.g., Guide to Community Preventive Services) settings, complements Healthy People 2020 objectives,¶ and serves as the tactical implementation of the National Strategy for Quality Improvement in Health Care's focus on CVD prevention. Although Million Hearts has a 5-year goal, improvements in clinical and community prevention are intended to continue to produce benefits over a much longer period.

Acknowledgment

NHANES staff members, National Center for Health Statistics, CDC.

References

Roger VL, Go AS, Lloyd-Jones DM, et al. Heart disease and stroke statistics---2011 update: a report from the American Heart Association. Circulation 2011;123:e18--209.
Heidenreich PA, Trogdon JG, Khavjou OA, et al. Forecasting the future of cardiovascular disease in the United States: a policy statement from the American Heart Association. Circulation 2011;123:933--44.
Farley TA, Dalal MA, Mostashari F, Frieden TR. Deaths preventable in the U.S. by improvements in use of clinical preventive services. Am J Prev Med 2010;38:600--9.
CDC. Vital signs: prevalence, treatment, and control of hypertension---United States, 1999--2002 and 2005--2008. MMWR 2011;60:103--8.
CDC. Vital signs: prevalence, treatment, and control of high levels of low-density lipoprotein cholesterol---United States, 1999--2002 and 2005--2008. MMWR 2011;60:109--14.
CDC. Best practices for comprehensive tobacco control programs---2007. Atlanta, GA: US Department of Health and Human Services, CDC; 2007. Available at http://www.cdc.gov/tobacco/stateandcommunity/best_practices/index.htm. Accessed September 9, 2011.
CDC. Sodium intake among adults---United States, 2005--2006. MMWR 2010;59:746--9.
CDC. Vital signs: current cigarette smoking among adults aged ≥18 years---United States, 2005--2010. MMWR 2011;60:1207--12.

* Additional information available at http://www.cdc.gov/nchs/nhanes.htm.

† Among the participants, 92% had two or three blood pressure measurements during a single physical examination at the mobile examination center; for those with only one blood pressure measurement, that single measurement was used in place of an average.

§ Available at http://www.nhlbi.nih.gov/guidelines/cholesterol