Impact of Smoking and Smoking Cessation on Arterial Stiffness and Aortic Wave Reflection in Hypertension

Abstract

Cigarette smoking is an important modifiable cardiovascular risk factor and pathophysiological mechanisms may include a stiff vascular tree. Although smokers have stiffer arteries, whether smoking cessation is associated with reduced arterial stiffness is not known. We compared never-treated patients with essential hypertension (n=554) aged 18 to 80 years (56% females) classified as current smokers (n=150), ex-smokers (n=136), and nonsmokers (n=268). Ex-smokers were categorized into 1 and 10 years of smoking cessation. Measurements included aortic stiffness, assessed as pulse wave velocity (Complior), wave reflection (augmentation index [AIx]), and transit time (T _R ) (Sphygmocor). Current and ex-smokers had significantly higher pulse wave velocity and AIx compared with nonsmokers (pulse wave velocity for current smokers: 10.7±0.2; ex-smokers: 10.6±0.2; nonsmokers: 9.9±0.1 m/s; P P R was lower in current and ex-smokers compared with nonsmokers (T _R for current smokers: 131±1.0; ex-smokers: 135±1; nonsmokers: 137±0.8 m/s; P P P R ( P P P R ( P <0.001), with arterial stiffness parameters returning to nonsignificant levels after a decade of smoking cessation.