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Long-Term Effect of Lipid-Lowering Therapy on Atherosclerosis of Abdominal Aorta in Patients with Hypercholesterolemia: Noninvasive Evaluation by a New Image Analysis Program

Recent clinical studies have demonstrated that 3-hydroxy-3-methylglutaryl coenzyme A (HMG- CoA) reductase inhibitors are effective in the prevention of cardiovascular events and regres sion of atherosclerotic lesions evaluated by angiography. In this study, the authors investigated how lipid-lowering therapy effects on the progression of aortic atherosclerosis by using plain and enhanced computed tomography (CT) of the lower abdominal aorta. Twenty-nine hyper lipidemic patients (mean age 61.4 ±7.2 yr) were enrolled in a prospective open-labeled study. All patients underwent baseline CT scanning of abdominal aorta, screening for serum lipid profile and coagulation-fibrinolysis measurement, then treatment with simvastatin was begun. After 2 years, a follow-up CT scan was done and atherosclerotic lesions were compared between baseline and on-treatment scan. In spite of significant improvement of lipid and fibri nolytic profiles by simvastatin administration, mean aortic wall thickening volume (AWV) was increased during observation period. When patients were divided into subgroups by the levels of on-treatment LDL cholesterol (LDL-C), development rate of AWV was more potently suppressed in patients whose on-treatment LDL-C were below 125 mg/dL (median LDL-C). We could not find any associations of coagulation-fibrinolysis measurements with atheroscle rotic lesions. In regard to aortic calcification volume (ACV), low levels of total and HDL choles terol and higher age were associated with aortic calcification at baseline. These results suggest that aggressive treatment with LDL-C below 125 mg/dL may suppress the progres sion of wall thickening and factors that promote arterial calcifications and those for wall thick ening may be different.