Long-Term Treatment with Probucol Improves Endothelial Function in Patients with Coronary Artery Disease

Recent studies have shown that endothelial function is impaired in patients with coronary artery disease (CAD). Probucol has been recognized to have antioxidant properties as well as lipid-lowering effects, and may improve endothelial function. The aim of this study was to evaluate the effects of probucol on endothelial function in patients with CAD. We evaluated endothelial function, based on flow-mediated vasodilation during reactive hyperemia (FMD), and the intima-media thickness (IMT) of the common carotid artery using high resolution ultrasonography in patients either with (CAD group, n =26) or without CAD (Control group, n =12). We measured the serum cholesterol concentration, including the low-density lipoprotein cholesterol (LDL-cholesterol) concentration, and the plasma concentrations of homocyst(e)ine and asymmetric dimethylarginine (ADMA). Measurements of FMD and serum cholesterol were repeated after 3 months of probucol (500 mg/day, n =9) or placebo (n =9) treatment in patients with CAD. The IMT was significantly greater (p