CLINICAL RESEARCH: METABOLIC SYNDROME
Metabolic Syndrome and Early-Onset Coronary Artery Disease
Is the Whole Greater Than Its Parts?
Carlos Iribarren, MD, MPH, PhD*, ,*,
Alan S. Go, MD*,,
Gail Husson, MPH, Med*,
Stephen Sidney, MD, MPH*,
Joan M. Fair, ANP, PhD ,
Thomas Quertermous, MD ,
Mark A. Hlatky, MD,|| and
Stephen P. Fortmann, MD
* Kaiser Permanente Division of Research, Oakland, California
Departments of Epidemiology, Biostatistics, and Medicine, University of California, San Francisco, California
Stanford Prevention Research Center
Division of Cardiovascular Medicine
|| Department of Health Research and Policy, Stanford University School of Medicine, Stanford, California
Manuscript received December 19, 2005;
revised manuscript received February 10, 2006,
accepted March 16, 2006.
* Reprint requests and correspondence: Dr. Carlos Iribarren, Research Scientist, Kaiser Permanente, Division of Research, 2000 Broadway, Oakland, California 94612. (Email: cgi{at}dor.kaiser.org).
OBJECTIVES: We sought to examine the association between the metabolic syndrome (MetS) (defined both by the 2001 National Cholesterol Educational Program Adult Treatment Panel III [ATP-III] definition and the American Heart Association/National Heart, Lung and Blood Institute [AHA/NHLBI] revision incorporating the lower threshold for impaired fasting glucose [IFG]) and early-onset coronary artery disease (CAD).
BACKGROUND: The impact of MetS on premature CAD has not been studied extensively. Lowering the threshold to define the IFG component (from 110 to 100 mg/dl) and the value of the syndrome as a whole versus its individual components are subjects of intense debate.
METHODS: We performed a case-control study with 393 early-onset CAD subjects (acute myocardial infarction, angina with  50% stenosis, or coronary revascularization) in men under age 46 years or women under age 56 years and 393 control subjects individually matched for gender, age, and race/ethnicity.
RESULTS: By conditional logistic regression, presence of ATP-III MetS without diabetes (adjusted odds ratio [adj-OR] 4.9; 95% confidence interval [CI] 3.4 to 8.0) and with diabetes (adj-OR 8.0, 95% CI 4.39 to 14.6) was a strong independent determinant of early-onset CAD. Using the AHA/NHLBI revision, these ORs became slightly stronger. However, neither definition of MetS remained significantly associated with early-onset CAD in multivariate models adjusting for individual components.
CONCLUSIONS: The presence of MetS imparts a high risk of early-onset clinical CAD, but the prognostic information associated with the syndrome is not greater than the sum of its parts.
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Abbreviations and Acronyms
| | ADA = American Diabetes Association | | ADVANCE = Atherosclerotic Disease, Vascular Function, and Genetic Epidemiology | | AHA/NHLBI = American Heart Association/National Heart, Lung, and Blood Institute | | CAD = coronary artery disease | | CARDIA = Coronary Artery Risk Development in Young Adults | | HOMA-IR = homeostasis model assessment of insulin resistance | | IFG = impaired fasting glucose | | KPNC = Kaiser Permanente of Northern California | | MetS = metabolic syndrome | | NCEP-ATP-III = National Cholesterol Educational Program Adult Treatment Panel III |
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