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Relation of the number of metabolic syndrome risk factors with all-cause and cardiovascular mortality

Am J Cardiol. 2008 Sep 15;102(6):689-92. Ho JS, Cannaday JJ, Barlow CE, Mitchell TL, Cooper KH, FitzGerald SJ. Cooper Clinic, Dallas, Texas, USA

The metabolic syndrome (MS) is a constellation of risk factors associated with diabetes and cardiovascular disease. This syndrome consists of at least 3 parameters assessing central obesity, hypertension, high-density lipoprotein cholesterol, triglycerides, and impaired glucose metabolism. Whether persons with 4 or 5 risk factors are at higher risk than those with 3 risk factors is unclear. Also unclear is whether those without the MS but with 1 or 2 risk factors warrant therapy. We assessed cardiovascular and all-cause mortality as a function of the number of these risk factors. We followed 30,365 men for a median follow-up of 13.6 years. During follow-up, 1,449 participants died, 527 from cardiovascular causes. All of the individual parameters defining the MS were significantly associated with both all-cause and cardiovascular mortality (p <0.001). After adjustment for age and the other MS variables, hypertension was the most potent risk factor whereas central obesity and hypertriglyceridemia remained associated with both all-cause and cardiovascular mortality. A highly significant trend was also noted between both all-cause or cardiovascular mortality and the number of risk factors (p <0.001 for trend). Risk increased incrementally, beginning at 1 risk factor for cardiovascular mortality and at 2 risk factors for all-cause mortality.

In conclusion, there is a continuum of risk as the number of metabolic syndrome risk factors increases. These findings add to the growing evidence that central obesity can independently and adversely affect health.

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