© 1999 American Heart Association, Inc.
Atherosclerosis and Lipoproteins |
LDL Size and Risk of Coronary Heart Disease in Elderly Men and Women
From the Division of Clinical Epidemiology (L.M., S.M.H.), Department of Medicine, University of Texas Health Science Center at San Antonio; the Department of Medicine (L.M., J.K., M.L.), University of Kuopio, Kuopio, Finland; and the Department of Epidemiology (M.A.A.), School of Public Health and Community Medicine, University of Washington, Seattle.
Abstract—A predominance of small, dense, low density lipoprotein (LDL) particles has consistently been associated with coronary heart disease (CHD) in young and middle-aged subjects in cross-sectional studies. Recently, 3 prospective, case-control studies showed that decreased LDL size is a predictor of CHD in middle-aged subjects. However, it is not known whether decreased LDL size is mainly associated with premature CHD or whether it continues to play a role in CHD risk at older ages also. We performed a prospective, nested case-control study in 86 subjects (58 nondiabetic and 28 type 2 diabetic) aged 65 to 74 years who were free of myocardial infarction at baseline and who then had a myocardial infarction or CHD death during a 3.5-year follow-up (cases) and in 172 controls matched for sex and diabetes status but who remained free of CHD during follow-up. LDL particle size determined by gradient gel electrophoresis (268.2±0.9 versus 268.5±0.7 Å, P=0.782) and the proportion of subjects with LDL subclass phenotype B (20.9 versus 21.5, P=0.914) were similar among cases and controls. Furthermore, diastolic blood pressure, total cholesterol, high density lipoprotein cholesterol, triglycerides, apolipoprotein A1, fasting glucose, fasting insulin, waist-to-hip ratio, and body mass index were not associated with CHD risk. However, smoking and increased systolic blood pressure, apolipoprotein B levels, and the total cholesterol–high density lipoprotein cholesterol ratio were significant predictors of CHD events both in univariate and multivariate analyses. Our findings indicate that LDL size is not a predictor of CHD events in elderly white subjects after controlling for diabetes status.
Key Words: lipoproteins • LDL • coronary heart disease • epidemiology • prospective study
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