Metabolic syndrome: Difference between revisions
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==Diagnostic criteria== | ==Diagnostic criteria== | ||
There | There are different clinical definitions of the metabolic syndrome; because of disagreement about the relative importance of insulin resistance in the cluster of risk factors, two definitions do not involve this risk factor.<ref name="pmid17259468">{{cite journal |author=Meigs JB ''et al.'' |title=Impact of insulin resistance on risk of type 2 diabetes and cardiovascular disease in people with metabolic syndrome |journal=Diabetes Care |volume=30 |pages=1219–25 |year=2007 |pmid=17259468 |doi=10.2337/dc06-2484 |issn=}}</ref> | ||
It is defined by the World Health Organisation using the following criteria: | It is defined by the World Health Organisation using the following criteria: | ||
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** Plasma triglycerides ≥150mg/dL (≥1.7mmol/L) | ** Plasma triglycerides ≥150mg/dL (≥1.7mmol/L) | ||
** HDL cholesterol <35mg/dL (0.9mmol/L) in men or <39mg/dL (1.0mmol/L) in women | ** HDL cholesterol <35mg/dL (0.9mmol/L) in men or <39mg/dL (1.0mmol/L) in women | ||
** BMI (Body Mass Index) >30kg/m² and/or waist:hip ratio >0.9 in men, >0.85 in women | ** BMI ([[Body Mass Index]]) >30kg/m² and/or waist:hip ratio >0.9 in men, >0.85 in women | ||
** Urinary albumin excretion rate ≥20μmg/g or albumin: creatinine ratio ≥30 mg/g.<ref name="pmid14766739">{{cite journal |author=Grundy SM | ** Urinary albumin excretion rate ≥20μmg/g or albumin: creatinine ratio ≥30 mg/g.<ref name="pmid14766739">{{cite journal |author=Grundy SM ''et al.'' |title=Definition of metabolic syndrome: report of the National Heart, Lung, and Blood Institute/American Heart Association conference on scientific issues related to definition |journal=Arterioscler Thromb Vasc Biol|volume=24 |pages=e13–8 |year=2004 |pmid=14766739 |doi=10.1161/01.ATV.0000111245.75752.C6}}</ref> | ||
==Risk factors for developing metabolic syndrome== | ==Risk factors for developing metabolic syndrome== | ||
Revision as of 10:44, 26 December 2012
| Metabolic syndrome | |
|---|---|
| OMIM | 605552 |
| MedlinePlus | 0072903 |
| MeSH | D024821 |
The metabolic syndrome, also known as the dysmetabolic syndrome, metabolic syndrome X, or insulin resistance syndrome, is defined as "a cluster of metabolic risk factors for cardiovascular diseases and type 2 diabetes mellitus. The main components of metabolic syndrome X include excess abdominal fat; atherogenic dyslipidemia; hypertension; hyperglycemia; insulin resistance; a proinflammatory state; and a prothrombotic (thrombosis) state."[1]
The metabolic syndrome is a major public health concern worldwide as a particularly serious consequence of the global obesity epidemic [2], but the metabolic syndrome can be present in the absence of frank obesity. Almost one fourth of Americans have metabolic syndrome, and the proportion keeps raising.[3]
The metabolic syndrome is a serious disturbance of body metabolism and physiology, consisting of resistance of certain cell types of the body to the ability of the hormone insulin to promote the entry into cells of the energy-rich molecule, glucose, and two or more of the following abnormalities: high blood pressure (or use of drugs to control hypertension); high levels of serum triglycerides; low levels of high-density lipoprotein (HDL) cholesterol; overweight; detectable levels of the protein albumin in the urine (microalbuminuria). The abnormalities of triglyceride levels typically associate with other blood fat disturbances (dyslipidemia) that foster atherosclerosis (the buildup of plaques in artery walls that can lead to reduced blood flow to vital organs, including the heart) and to formation of blood clots that can break off and clog vital vessels to the brain, causing stroke. The biochemical factors that promote clot formation are also stimulated in the metabolic syndrome, and the syndrome appears to be one of a chronic state of inflammation, the typical body response to tissue injury.
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Metabolic syndrome (MS) is a constellation of metabolic derangements associated with vascular endothelial dysfunction and oxidative stress and is widely regarded as an inflammatory condition, accompanied by an increased risk for cardiovascular disease.[4] Diagnostic criteriaThere are different clinical definitions of the metabolic syndrome; because of disagreement about the relative importance of insulin resistance in the cluster of risk factors, two definitions do not involve this risk factor.[5] It is defined by the World Health Organisation using the following criteria:
Risk factors for developing metabolic syndromeSuboptimal dietary potassiumIn a cros-sectional study of a representative sample of the U.S. population (>25,000 participants analyzed), Sharma and colleagues[7] concluded: "Low dietary potassium intake is associated with an increased risk of metabolic syndrome in US adults." The study merely identifies an association of low dietary potassium in adults meeting the diagnostic criteria of metabolic syndrome. The association analysis suggested an increased risk of metabolic syndrome of 35% for those with metabolic syndrome consuming 44 mmol/day [1701 mg/day] or less, when compared to those consuming 84 mmol/day [3290 mg/day] or more. The recommended intake of potassium for adult Americans: 120 mmol/day [4700 mg/day]. Accordingly, we do not know what the relative risk of metabolic syndrome when the lower potassium intakes compare with intakes greater than 120 mmol/day, nor from the associational study, whether some type of interventional study that raised potassium intake to >120 mmol/day could prevent or mitigate the metabolic syndrome. Psychological componentsAn interesting but yet underdevelopped aspect of research on the metabolic syndrome relates to the syndrome's psychological components. Cynical hostility appears to predict the metabolic syndrome, which in turn predicts cardiovascular disease.[8] Worthy of note, in a study, only high hostility and low HDL cholesterol predicted coronary heart disease.[9] At present, there is no agreement on the nature of the relationship between hostility and the metabolic syndrome. Consequences of the metabolic syndromeDiabetic complications and cardiovascular diseasesThe metabolic syndrome is thus a cluster of risk factors for diabetes complications and cardiovascular diseases. The syndrome includes proinflammatory and prothrombotic features.[6] Other consequencesThe metabolic syndrome could also promote the development of cancer, polycystic ovary syndrome (PCOS), and nonalcoholic fatty liver disease".[10] CancerA number of components of the metabolic syndrome (MS) are likely to contribute, especially in combination, to cause cancer. While the MS-colon cancer is the most convincing link, other epidemiologic studies investigating the link of MS with other cancers are awaited.[11] References
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