Hyperlipoproteinemia impairs endothelium-dependent vasodilation.
Atherogenic lipoproteins can cause endothelial dysfunction in the initial stage of atherogenesis. In our study we examined 134 patients with defined hyperlipoproteinemia (non-HDL cholesterol>4.1 mmol/l or triglycerides>2.5 mmol/l or taking any of lipid lowering drugs)--94 men and 40 women. The subgroup of controls of comparable age contained 54 normolipidemic individuals--30 men and 24 women. Patients with hyperlipoproteinemia revealed significantly lower ability of endothelium-dependent flow-mediated vasodilation (EDV) measured on brachial artery (4.13+/-3.07 vs. 5.41+/-3.82 %; p=0.032) and higher carotid intima media thickness than normolipidemic controls (0.68+/-0.22 vs. 0.58+/-0.15 mm; p=0.005). In regression analysis, EDV correlated significantly with plasma concentrations of oxLDL (p<0.05) HDL-cholesterol (p<0.05), Apo A1 (p<0.05), ATI (p<0.01) and non-HDL cholesterol (p<0.05). Patients with hyperlipoproteinemia showed higher plasma levels of oxLDL (65.77+/-9.54 vs. 56.49+/-7.80 U/l; p=0.015), malondialdehyde (0.89+/-0.09 vs. 0.73+/-0.08 micromol/l; p=0.010) and nitrites/nitrates (20.42+/-4.88 vs. 16.37+/-4.44 micromol/l; p=0.018) indicating possible higher long-term oxidative stress in these patients.
Second Department of Internal Medicine, Third Faculty of Medicine, Charles University, Srobárova 50, 100 00 Prague 10, Czech Republic. kraml@fnkv.cz
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Kraml
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Syrovátka
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Stípek
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Fialová
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Koprivová
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Potocková
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Andel
D017677:Age Distribution; D000368:Aged; D001161:Arteriosclerosis / Q000097:blood* / Q000453:epidemiology* / Q000473:pathology; D015984:Causality; D015331:Cohort Studies; D015897:Comorbidity; D018153:Czech Republic / Q000453:epidemiology; D004108:Dilatation, Pathologic / Q000097:blood / Q000453:epidemiology / Q000473:pathology; D004730:Endothelium, Vascular / Q000378:metabolism* / Q000473:pathology; D005260:Female; D006801:Humans; D006951:Hyperlipoproteinemias / Q000097:blood* / Q000453:epidemiology* / Q000473:pathology; D015994:Incidence; D008074:Lipoproteins / Q000097:blood*; D008297:Male; D008875:Middle Aged; D018570:Risk Assessment; D012307:Risk Factors; D017678:Sex Distribution; D014664:Vasodilation
D008074:Lipoproteins