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(Hypertension. 2001;37:6.)
© 2001 American Heart Association, Inc.

Scientific Contributions

Effects of Blood Pressure, Smoking, and Their Interaction on Carotid Artery Structure and Function

Yu-Lu Liang; Louise M. Shiel; Helena Teede; Dimitra Kotsopoulos; John McNeil; James D. Cameron; Barry P. McGrath

From the Vascular Research Group (Y.-L.L., L.M.S., H.T., D.K., B.P.M.), Department of Medicine, and Department of Epidemiology and Preventive Medicine (J.M.), Monash University, Melbourne, Australia; and Department of Electronic Engineering (J.D.C.), La Trobe University, Melbourne, Australia.

Correspondence to Prof Barry McGrath, Monash University Department of Vascular Sciences and Medicine, Dandenong Hospital, David Street, Dandenong 3175, Victoria, Australia.

Abstract—In the present study, we examined the relationships among carotid blood pressure, arterial geometry, and wall stress and determined the impact of hypertension, smoking status, and their interaction on these relationships. The study involved 679 subjects aged 49 to 82 years: 372 smokers (190 men and 182 women) and 307 nonsmokers (110 men and 197 women). Blood samples were taken to determine total cholesterol levels. Central pulse pressure was derived from measured brachial artery pressure with a linear regression equation from data obtained in a subgroup of 276 subjects that related brachial and carotid pulse pressures; the latter was measured with applanation tonometry. Carotid intima-media thickness (IMT), lumen diameter (D), and stiffness index (SI) were determined with high-resolution B-mode ultrasound. Mean and pulsatile circumferential stress (_C) was calculated according to the Laplace relationship. Indexes of arterial geometry and function were adjusted for age, height, and heart rate. Hypertension (treated and/or screening blood pressure of >140/90 mm Hg) was present in 71 nonsmokers and 186 smokers. Nonsmokers and smokers did not differ in blood pressure and cholesterol levels. Hypertension and smoking individually and interactively significantly increased adjusted IMT, D, and SI. The radius-to–wall thickness ratio (R/IMT) (where R=D/2) and _C were increased in hypertensives. SI was correlated with IMT (r=0.56, P<0.001); radius-to–wall thickness ratio was inversely correlated with central pulse pressure (r=-0.38, P<0.001). Smoking did not influence these relationships. In conclusion, carotid artery wall remodeling appears to follow Laplace’s law but is insufficient to prevent an increase in circumferential stress in hypertensive subjects. Unlike hypertension, smoking does not influence the lumen-to-wall ratio but has a significant effect on wall stiffness.

Key Words: aging • carotid arteries • pulse • blood pressure • smoking

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