Abstract:
BACKGROUND AND PURPOSE:Elevated low density lipoprotein and reduced high density lipoprotein cholesterol may increase the risk of atherothrombotic brain infarction, but the metabolic mechanisms accounting for this relation are poorly understood. METHODS:The kinetic parameters of low density and high density lipoprotein were studied in nine subjects with atherothrombotic brain infarction or identifiable (by noninvasive testing) extracranial occlusive disease and in 12 control subjects. Autologous iodine-125-labeled lipoproteins were injected intravenously. Blood samples were drawn 10 minutes after injection and periodically thereafter for 10 days. Kinetic parameters were calculated from the decay curves. RESULTS:The stroke-risk group showed significantly higher triglyceride (p less than 0.05), total cholesterol (p less than 0.02), and low density lipoprotein cholesterol (p less than 0.01). The fractional catabolic rate of low density lipoprotein was significantly lower (p less than 0.001) and the high density lipoprotein rate higher (p less than 0.02) in the stroke-risk group than in the control group. Regression analysis (using all subjects) of serum lipoproteins and their respective fractional catabolic rates correlated significantly (for low density lipoprotein, r = 0.684, p less than 0.001; for high density lipoprotein, r = 0.595, p less than 0.002). Mean percent stenosis showed a significant relation with triglyceride level (r = 0.678, p less than 0.01) and low density lipoprotein cholesterol (r = 0.535, p less than 0.02) but not with high density lipoprotein cholesterol. Mean percent stenosis also showed correlation with both fractional catabolic rate of low density lipoprotein (r = 0.667, p less than 0.002) and with serum high density lipoprotein levels (r = 0.504, p less than 0.02). CONCLUSIONS:Our study provides insights into the role of altered low and high density lipoprotein metabolism in the pathogenesis of carotid stenosis. The statistically significant association of serum lipoprotein metabolic rates with carotid stenosis, rather than their respective serum concentrations, implies that metabolic parameters may be more important in predicting stroke risk.
journal_name
Strokejournal_title
Strokeauthors
Alam R,Yatsu FM,Kasturi R,Bui Gdoi
10.1161/01.str.23.9.1265subject
Has Abstractpub_date
1992-09-01 00:00:00pages
1265-70issue
9eissn
0039-2499issn
1524-4628journal_volume
23pub_type
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