(Hypertension. 1996;28:593-598.)
© 1996 American Heart Association, Inc.
Articles |
Insulin Resistance as an Independent Risk Factor for Carotid Wall Thickening
the Division of Atherosclerosis, Metabolism, and Clinical Nutrition, Department of Medicine, National Cardiovascular Center, Osaka, and Department of Applied Mathematics, Faculty of Science, Konan University (Y. Hattori), Kobe, Japan.
It has been reported that insulin resistance is associated with essential hypertension and that an aggregation of risk factors—hypertension, dyslipidemia, and glucose intolerance—together with insulin resistance leads to the more frequent appearance of coronary artery disease. We examined the relation between early asymptomatic atherosclerosis and these risk factors in 72 nondiabetic subjects with essential hypertension (41 men, 31 women) aged 50 to 59 years. Intima-media thickness and plaque formation of the carotid artery were assessed by B-mode ultrasonography, and insulin sensitivity was measured by the steady-state plasma glucose method. Lipoprotein profile was analyzed by ultracentrifugation. The intima-media thickness of the common carotid artery significantly correlated with systolic pressure; mean blood pressure; steady-state plasma glucose, indicating insulin resistance; fasting insulin; area under the curve of plasma insulin and glucose; body mass index; apolipoprotein B; apolipoprotein B in low-density lipoprotein; lower ratio of cholesterol to apolipoprotein B of low-density lipoprotein; and decreased high-density lipoprotein cholesterol. By multiple regression analysis, steady-state plasma glucose was the strongest risk, followed by lower high-density lipoprotein and systolic pressure. These three factors accounted for 54.9% of all the risk for increased intima-media thickness of the common carotid artery. In conclusion, insulin resistance was the strongest risk factor for carotid intima-media thickness, followed by lower high-density lipoprotein cholesterol and hypertension. An effort to maintain normal insulin sensitivity is essential for the prevention of early atheromatous lesions in essential hypertension.
Key Words: carotid arteries • hypertension, essential • insulin resistance • lipoproteins
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