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(Circulation. 2006;113:2943-2946.)
© 2006 American Heart Association, Inc.
ADA/AHA Scientific Statement |
| Introduction |
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Overweight or obesity results in a wide range of elevated risk factors and many fatal and nonfatal conditions.4 Paradoxically, although we have witnessed decades in which heart disease and stroke have steadily declined and cancer mortality has at worse remained stable,5 the prevalence of diabetes has soared.6 The increase in diabetes can largely be attributed to weight gain,7,8 and it threatens the enormous advances in disease prevention we have seen.3,9,10
Among individuals with diabetes, cardiovascular disease (CVD) is the leading cause of morbidity and mortality9,11; adults with diabetes have a two- to fourfold higher risk of CVD compared with those without diabetes.12,13 Diabetes is also accompanied by a significantly increased prevalence of hypertension and dyslipidemia.14
It is reasonable to postulate that in many individuals, excess weight gives rise to diabetes, hypertension, and dyslipidemia, thereby leading to frank CVD.1517 This seemingly simple algorithm is undoubtedly more complex because (1) many studies show that hyperglycemia at pre-diabetic levels is an independent risk factor for CVD,1822 (2) central obesity (i.e., intra-abdominal or visceral fat) may have a greater detrimental effect than overall weight/BMI,8,23,24 and (3) there is a complex relationship between lipid metabolism and hyperglycemia.25,26 Moreover, obesity in the absence of glucose intolerance is associated with CVD, including coronary heart disease, stroke, and heart failure.27
The association among diabetes, hypertension, and dyslipidemia has been known for many decades, but the seminal paper by Reaven28 ascribing much of the etiology of these risk factors to insulin resistance ushered in a new era of research and awareness29 and the call for a better appreciation of the impact of obesity on CVD. Also, the concept that these "metabolic" abnormalities can cluster in many individuals gave rise to the term "metabolic syndrome," and this construct has been the subject of many thousands of publications and extensive reviews. Although the metabolic syndrome has been embraced by many individuals and organizations,2933 others have questioned its clinical utility.3438
Unfortunately, some of the medical press have positioned the scientific issues related to the metabolic syndrome as a "battle"39,40 between the American Diabetes Association and the American Heart Association, implicitly suggesting that CVD risk factor identification and treatment is now questionable. We are concerned that the presumed dispute will lead to a reduction in the favorable trend of many aspects of CVD risk factor reduction.41
The intent of this article is to clarify and reinforce the notion that our organizations remain unified and committed to reducing the burden of diabetes and CVD. The importance of identifying and treating a core set of risk factors (pre-diabetes, hypertension, dyslipidemia, and obesity) cannot be overstated, and our commitment is evidenced by other previous joint publications.42,43 While unrelated to an underlying metabolic abnormality, tobacco use also deserves special attention. Moreover, since recent evidence suggests that risk assessment and adherence to national guidelines remains woefully suboptimal,4446 we call for a renewed effort to prevent and treat these conditions.
| Risk Assessment |
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Conversely, emerging evidence suggests that simply ascertaining a persons blood glucose level, blood pressure, LDL cholesterol level, and tobacco use and noting the presence of obesity may be sufficient to initiate the appropriate interventions to prevent or identify diabetes and emerging CVD.22,24,50,51 Even borderline abnormalities, especially if they are multiple, may well presage future problems and should be addressed. Certainly, a number of intriguing scientific questions remain regarding the relative impact of each risk factor, the hierarchy of risk factors, the inclusion of other risk factors, and the relationships among all of them; however, at the very least, we encourage providers to be cognizant of these key parameters.
| Risk Factor Management |
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| Summary |
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It must be remembered that obesity is far more than an unattractive appearance but can be prevented. Moreover, it is often a visible marker of other underlying risk factors that can be addressed. Thus, the overweight or obese patient deserves major clinical attention. The growing prevalence of this condition threatens to undermine all of our recent gains to prevent and control chronic disease.
| Acknowledgments |
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| Footnotes |
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This statement was approved by the American Heart Association Science Advisory and Coordinating Committee on April 24, 2006. A single reprint is available by calling 800-242-8721 (US only) or writing the American Heart Association, Public Information, 7272 Greenville Ave, Dallas, TX 75231-4596. Ask for reprint No. 71-0366. 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 kelle.ramsay@wolterskluwer.com. To make photocopies for personal or educational use, call the Copyright Clearance Center, 978-750-8400.
Expert peer review of AHA Scientific Statements is conducted at the AHA National Center. For more on AHA statements and guidelines development, visit http://www.americanheart.org/presenter.jhtml?identifier=3023366.
Simultaneous publication: This article is being simultaneously published in 2006 in Diabetes Care and Circulation by the American Diabetes Association and American Heart Association.
| References |
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