Effects of Lowering Average or Below-Average Cholesterol Levels on the Progression of Carotid Atherosclerosis

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Abstract
Background—Cholesterol lowering in patients with above-average cholesterol levels has been shown to reduce the progression of atherosclerosis and lower the risk of coronary heart disease events. However, there has been uncertainty about the effects of cholesterol lowering in patients with average or below-average cholesterol levels. Methods and Results—In this study, 522 patients with a history of myocardial infarction or unstable angina and with baseline levels of total cholesterol between 4 and 7 mmol/L (mean, 5.7 mmol/L) were randomized to treatment with a low fat diet plus pravastatin (40 mg daily) or to a low fat diet plus placebo. Treatment with pravastatin reduced the levels of total cholesterol by 19%, LDL cholesterol by 27%, apolipoprotein B by 19%, and triglycerides by 13% (all 2P<.0001) and increased apolipoprotein A1 and HDL cholesterol levels by 4% (both 2P<.0005), in comparison with placebo. Carotid atherosclerosis was assessed from B-mode ultrasound measurements of the common carotid artery...

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