Published online before print December 19, 2002, doi: 10.1161/01.ATV.0000053385.64132.2D
© 2003 American Heart Association, Inc.
Atherosclerosis and Lipoproteins |
Smallest LDL Particles Are Most Strongly Related to Coronary Disease Progression in Men
From the Life Sciences Division (P.T.W., P.J.B., L.G.H., R.M.K.), E.O. Lawrence Berkeley National Laboratory, University of California, Berkeley; Berkeley HeartLab (H.R.S.), Burlingame; and Stanford University School of Medicine (W.L.H., E.L.A.), Palo Alto, Calif.
Reprint requests to Ronald M Krauss, MD, Children’s Hospital Oakland Research Institute, 5700 Martin Luther King Jr Way, Oakland, CA 94609. E-mail rmkrauss{at}lbl.gov
Objective— LDLs include particle subclasses that have different mobilities on polyacrylamide gradient gels: LDL-I (27.2 to 28.5 nm), LDL-IIa (26.5 to 27.2 nm), LDL-IIb (25.6 to 26.5 nm), LDL-IIIa (24.7 to 25.6 nm), LDL-IIIb (24.2 to 24.7 nm), LDL-IVa (23.3 to 24.2 nm), and LDL-IVb (22.0 to 23.3 nm in diameter). We hypothesized that the association between smaller LDL particles and coronary artery disease (CAD) risk might involve specific LDL subclasses.
Methods and Results— Average 4-year onstudy lipoprotein measurements were compared with annualized rates of stenosis change from baseline to 4 years in 117 men with CAD. The percentages of total LDL and HDL occurring within individual subclasses were measured by gradient gel electrophoresis. Annual rate of stenosis change was related concordantly to onstudy averages of total cholesterol (P=0.04), triglycerides (P=0.05), VLDL mass (P=0.03), total/HDL cholesterol ratio (P=0.04), LDL-IVb (P=0.01), and HDL3a (P=0.02) and inversely to HDL2-mass (P=0.02) and HDL2b (P=0.03). The average annual rate in stenosis change was 6-fold more rapid in the fourth quartile of LDL-IVb (
5.2%) than in the first quartile (<2.5%, P=0.03). Stepwise multiple regression analysis showed that LDL-IVb was the single best predictor of stenosis change.
Conclusions— LDL-IVb was the single best lipoprotein predictor of increased stenosis, an unexpected result, given that LDL-IVb represents only a minor fraction of total LDL.
Key Words: lipoproteins • coronary disease • risk factors • LDL • HDL
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