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(Arteriosclerosis, Thrombosis, and Vascular Biology. 1999;19:436-441.)
© 1999 American Heart Association, Inc.

Original Contributions

Large-Artery Elastic Properties in Young Men

Relationships to Serum Lipoproteins and Oxidized Low-Density Lipoproteins

Jyri O. Toikka; Pekka Niemi; Markku Ahotupa; Harri Niinikoski; Jorma S. A. Viikari; Tapani Rönnemaa; Jaakko J. Hartiala; Olli T. Raitakari

From the Departments of Clinical Physiology (J.O.T., J.J.H., O.T.R.), Radiology (P.N.), and Medicine (J.S.A.V.), Turku University Central Hospital, Finland; and the MCA Research Laboratory, Department of Physiology (M.A.), and the Cardiorespiratory Research Unit (H.N.), University of Turku, Finland.

Correspondence to Jyri O. Toikka, Department of Clinical Physiology, Turku University Hospital, Kiinamyllynkatu 4-8, FIN-20520 Turku, Finland. E-mail jyri.toikka{at}utu.fi

Abstract—Measures of arterial elasticity have been proposed as surrogate markers for asymptomatic atherosclerosis. We investigated the relations of serum lipoproteins, oxidized low-density lipoprotein (ox-LDL), and familial hypercholesterolemia (FH) to arterial elasticity among young men. As a marker of arterial elasticity we measured compliance in the thoracic aorta by using magnetic resonance imaging and in the common carotid artery by using ultrasound. LDL diene conjugation was used as a marker of ox-LDL. In study I, 25 healthy men (aged 29 to 39) were classified into 2 extreme groups according to previously measured high-density lipoprotein cholesterol to total cholesterol ratio (HDL-C/TC ratio). In study II, the healthy men were used as controls for 10 age matched asymptomatic patients with FH. In healthy men, the group with low HDL-C/TC ratio had decreased carotid artery compliance (2.3±0.4% versus 1.9±0.5%/10 mm Hg, P=0.034). In univariate analysis, the compliance of the carotid artery associated with ox-LDL (r =-0.49, P=0.016) and HDL-C/TC ratio (r=0.41, P=0.040). In multivariate regression analyses, ox-LDL was the only independent determinant for compliance of the carotid artery (P=0.016). Aortic elasticity was not related to standard lipid variables, but the compliance of the ascending aorta associated with ox-LDL (r=-0.44, P=0.030). In FH patients, arterial elasticity was similar to that in controls. We conclude that elasticity of the common carotid artery is affected by serum lipid profile in young men. The current study demonstrates for the first time an in vivo association between ox-LDL and arterial elasticity suggesting that oxidative modification of LDL may play a role in the alteration of arterial wall elastic properties.

Key Words: arteries • lipoproteins, LDL • hypercholesterolemia, familial

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