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Brief Reviews |
From the Center for Human Nutrition, Departments of Clinical Nutrition and Internal Medicine, University of Texas Southwestern Medical Center at Dallas.
Correspondence to Scott M. Grundy, Center for Human Nutrition, Departments of Clinical Nutrition and Internal Medicine, University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Y3.206, Dallas, TX 75390-9052. E-mail scott.grundy{at}utsouthwestern.edu
Series Editor: Marja-Riitta Taskinen
Metabolic Syndrome and Atherosclerosis
ATVB In Focus
Preview Brief Reviews in this Series:
Barter PJ, Rye KA. Is There a Role For Fibrates in the Management of Dyslipidemia in the Metabolic Syndrome. Arterioscler Thromb Vasc Biol. 2008;28:39–46.
Gustafson B, Hammarstedt A, Andersson CX, and Smith U. Inflamed adipose tissue: a culprit underlying the metabolic syndrome and atherosclerosis. Arteroscler Thromb Vasc Biol. 2007;27:2276–2283.
Kotronen A, Yki-Järvinen. Fatty liver: a novel component of the metabolic syndrome. Arteroscler Thromb Vasc Biol. 2008;28:27–38.
| Abstract |
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The metabolic syndrome represents a clustering of metabolic risk factors for cardiovascular disease. The available evidence indicates that in most countries between 20% and 30% of the adult population has the metabolic syndrome. Because of this relatively high prevalence, the metabolic syndrome accounts for an increasing proportion of cardiovascular risk worldwide.
Key Words: obesity hypertension diabetes lipids acute coronary syndrome
| Introduction |
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The risk for ASCVD accompanying the MetS is approximately doubled compared with an absence of the syndrome.1 For example, a recent meta-analysis including 43 cohorts (172 573 individuals) reported that metabolic syndrome conveyed a relative risk (RR) for CVD events and death of 1.78.4 In women the risk was highest (RR 2.63). In addition, risk was still associated with the syndrome after adjusting for traditional CVD risk factors (RR 1.54); this finding indicates that risk accompanying the syndrome cannot be explained entirely by the latter. Other reports support this conclusion.5 In those without type 2 diabetes, the likelihood of developing diabetes is increased approximately 5-fold. The MetS appears to promote the development of ASCVD at multiple levels. Elevations of apo B-containing lipoproteins initiate atherogenesis and drive lesion development.6 Atherosclerotic plaque development is accelerated by low levels of HDL, by elevated BP, by inflammatory cytokines, and likely by elevated plasma glucose.7 More advanced plaques tend to become unstable, which in turn predisposes to plaque rupture.8 When rupture occurs, a prothrombotic state promotes propagation of thrombi that can worsen cardiovascular syndromes.
An important point to make about the metabolic syndrome is that it is not a substitute for global risk assessment in determining absolute risk of individuals for the purpose of initiating preventive drug therapy. Instead the metabolic syndrome represents that part of global risk that can be attributed to underlying metabolic causes such as obesity and abnormal body fat distribution. Although the presence of the metabolic syndrome may influence choice of drug therapies, its presence essentially denotes the need to emphasize lifestyle management in clinical practice.
| Criteria for MetS |
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Some investigators have questioned the clinical utility of the metabolic syndrome.11 The claim is made that the primary clinical focus should remain on the individual metabolic risk factors and that aggregating them into a syndrome adds little to clinical management. The counter argument is that identification of risk-factor clustering changes the clinical focus to underlying causes, which calls for greater emphasis on lifestyle therapies to reduce long-term risk for CVD.1 In spite of this disagreement over clinical strategy, most investigators agree that clustering of metabolic risk factors is a real and relatively common phenomenon. If the major purpose of the metabolic-syndrome concept is to shift emphasis to earlier intervention with lifestyle therapies, it is reasonable to extend the concept to obese children and adolescents where the syndrome already is beginning to take hold. Although pediatricians are showing increasing interest in the concept, there is at present no agreement on how best to define and approach the problem clinically.12
| Worldwide Prevalence of the MetS |
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| United States and Canada |
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30 kg/m2).14 Among the latter, about 5% of the population is extremely obese (BMI
40 kg/m2).14 Further and more alarming, approximately 16% of female children and adolescents are classified as overweight, and for males, about 18%.14 In Canada, 36% of adults are overweight and 23% are obese.15 Notable is the 10% lower prevalence in obese adults in Canada compared with the US. In 1988 to 1994, at least one-fourth of the population had the MetS by NCEP criteria. A similar prevalence was reported for Canada. The prevalence of the syndrome is strongly related to age. By age 60, the percentage affected in the USA was approximately 40%.16 Men and women are affected about equally. Each of the metabolic risk factors—abdominal obesity, elevated TG, low HDL-C, elevated blood pressure, and elevated plasma glucose—occurs in approximately one third of the US population. The original NCEP threshold for elevated glucose was 110 mg/dL; at this cut point, only about 15% of the US population had a high glucose. In 2005, the AHA/NHLBI lowered the glucose threshold to 100 mg/dL.1 This change led to an increase in elevated glucose to a level comparable to that of other risk factors. As a result of this change, the overall prevalence of the MetS was raised by about 6%.
Between NHANES 1988 to 94 and NHANES 1999 to 2000, the prevalence of the MetS increased. Ford et al17 estimated that
50 million Americans had the MetS in 1990 and
64 million had the syndrome in 2000. Two factors appear to account for this increase. One of these is obesity; in 1988 to 1994 the prevalence of obesity was 22.5%, and in 1999 to 2000, it had increased to 30.5%.18 A second factor is aging of the population.19 For any level of BMI, the prevalence of the MetS in the US population rises with increasing age. This effect can be explained largely by age-related rises of blood pressure and glucose.19
Black Americans
Ford et al16 reported that MetS is more common in Black women than in Black men. This contrasts with the similar gender prevalence for Whites. Black men in particular have a relatively low prevalence, using NCEP criteria, compared with other ethnic groups. Reasons for lower frequency in Black men are lower waist circumferences on average, lower triglycerides, and higher HDL-C levels.20,21 The latter appear to be related to a genetic/racial predisposition to reduced activities of hepatic lipase.22,23 Whether lower triglycerides and higher HDL-C protect against CVD in Black men is uncertain. On the other hand, Blacks in general are more insulin resistant than are Whites.24,25 They are also more prone to hypertension26 and to diabetes.27,28 Thus, any protective effect of less dyslipidemia among US Blacks probably is negated by a higher frequency of other metabolic risk factors, notably insulin resistance, hypertension, and diabetes. Particularly in the case of Black men, NCEP criteria for the MetS may not provide a full picture of the metabolic disturbance that is common in this population.
Hispanic Americans
In 1988 to 1994, the highest prevalence of MetS among any ethnic group in the USA was found in Hispanics (32% of the population).16 Hispanic women were especially prone to the syndrome with about 35% being affected. One reason for this relatively high prevalence of the MetS may be a greater insulin resistance.29 In the Hispanic population, insulin resistance seems to be out of proportion to the severity of obesity. Support for excessive insulin resistance among Hispanics comes from the fact that this population has the highest rates of T2DM in the USA.30,31 Although there is a trend for Hispanic Americans to be more obese than Whites, the difference is not great enough to account for the much higher prevalence of T2DM in the former.32,33 In contrast to Blacks, Hispanics are more likely to have hypertriglyceridemia than are Whites, although they do not have a higher prevalence of low HDL-C.16 The high frequency of hypertriglyceridemia in this population correlates with an increased prevalence of fatty liver.34 The frequency of hypertension is lower in middle-aged Hispanic men than in either White or Black counterparts; this difference compared with Whites however disappears with aging. Hispanic women in contrast have similar hypertension rates as White women.35 Thus the pattern of MetS in Hispanic American is one in which obesity appears to drive glucose intolerance and hyperglycemia.
Other Adult Populations
In the USA and Canada, several other ethnic groups have been examined to determine the prevalence of the MetS. Native Americans represent one population that is particularly susceptible to T2DM. This high susceptibility undoubtedly is related in part to a high prevalence of obesity; but like Hispanics, Native Americans appear to have insulin resistance out of proportion to the severity of obesity.36 This predisposition to insulin resistance may account for the 35% prevalence of MetS among adult Native Americans.37 A similar or even higher prevalence of MetS has been reported for aboriginal Ontario, Canada Oji-Cree.38 Up to 50% of this population in Western Canada carry the MetS.38 It is possible that there is a strong genetic component for MetS in this population because functional polymorphisms in 3 candidate genes for plasma lipoproteins and blood pressure—angiotensinogen (AGT T174 M), G protein beta3 (GNB3 825C>T), and apolipoprotein C3 (–455T>C)—were associated with MetS.39 Among Arab American adults in the Detroit area, age-adjusted prevalence of MetS was 23%40; rates were similar for men and women aged 20 to 49 years but were significantly higher for women aged
50 years.
Children and Adolescents
Of particular concern is a rising prevalence of the MetS in US youth. This rise undoubtedly results from an increasing obesity in younger people.41 According to Daniels et al42 approximately 1 million US adolescents meet the NCEP criteria for MetS. This corresponds to a prevalence of about 4% of all adolescents. Among overweight adolescents, MetS rates rise to 30% to 50%.42
| Metabolic Syndrome in Europe |
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| Metabolic Syndrome in Asia |
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| Metabolic Syndrome in Latin America |
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| Conclusions |
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| Acknowledgments |
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None.
| Footnotes |
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| References |
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