© 1999 American Heart Association, Inc.
Original Contributions |
Structural, Functional, and Hemodynamic Changes of the Common Carotid Artery With Age in Male Subjects
From the Freiburg University Hospital, Center for Internal Medicine, Department of Rehabilitation, Preventative and Sports Medicine, Freiburg, Germany.
Correspondence to Arno Schmidt-Trucksäss, MD, Freiburg University Hospital, Center for Internal Medicine, Department of Rehabilitation, Preventative and Sports Medicine, Hugstetter Str 55, 79106 Freiburg, Germany. E-mail schmidt{at}msm1.ukl.uni-freiburg.de
Abstract—Aging of the common carotid artery (CCA) is associated with different principal structural, functional, and hemodynamic changes, which are often influenced by several atherosclerotic risk factors, so that it is difficult to estimate the exclusive effect of aging on this process. Studies dealing with vascular aging of the CCA usually assess only single, dimensional, or functional parameters, although it is likely that there are interactions and probably differences between them. Moreover, regional vascular blood flow characteristics are often not taken into consideration. Therefore, the aim of the study was to assess the age-related multiparametric changes of the CCA properties with ultrasound in 69 male subjects between the ages of 16 and 75 (42.4±16.5 years), who were screened for the absence of major atherosclerotic risk factors or existing vascular disease. As a result, the intima media thickness (0.052 mm/10 y) and diastolic diameter (0.17 mm/10 y) increased nearly linearly with age (r=0.60, P<0.001; and r=0.46, P<0.001, respectively). The absolute diastolic/systolic diameter change diminished by 0.10 mm/10 y (r=-0.73, P<0.001) and peak expansion velocity dropped by 0.12 cm/s per 10 years (r=-0.62, P<0.001) highly significantly with age. The peak blood flow velocity decreased continuously with age (r=-0.67, P<0.00) by 9.3 cm/s per 10 years. According to multiple regression analysis, peak blood flow velocity seems to reflect the changes of several structural and functional parameters in one; intima-media thickness was determined by diastolic arterial diameter and age as independent variables. The data indicate that a multiparametric assessment may contribute to a better understanding of vascular aging and might be the basis for further studies to evaluate the association of atherosclerotic risk factors and/or major vascular disease with local changes in the CCA.
Key Words: carotid artery • aging • arterial stiffness • ultrasound
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