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The role of plasma lipids in carotid bifurcation atherosclerosis
Insights
The study found that a higher ratio of total cholesterol to high-density lipoprotein cholesterol (HDL-C) and lower HDL-C levels are linked to carotid atherosclerosis. Other lipid levels showed weaker or no correlation with this condition.
Area of Science:
- Cardiovascular Science
- Neuroscience
- Lipid Metabolism
Background:
- Coronary artery atherosclerosis severity correlates with lipid profiles, including total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), triglycerides, and high-density lipoprotein cholesterol (HDL-C).
- The relationship between plasma lipoproteins and cerebral atherosclerosis, specifically carotid bifurcation atherosclerosis, is less understood.
- Previous research suggests an inverse correlation between lipoprotein abnormalities and cerebral infarction incidence.
Purpose of the Study:
- To investigate the association between plasma lipoprotein concentrations and the extent of carotid bifurcation atherosclerosis.
- To identify specific lipid risk factors contributing to the development of carotid atherosclerosis.
Main Methods:
- Analysis of risk factors for carotid bifurcation atherosclerosis in 121 consecutive patients undergoing cerebral angiography.
- Correlation analysis between plasma lipid levels (TC, LDL-C, HDL-C, triglycerides, TC/HDL-C ratio) and the measured extent of atherosclerosis.
Main Results:
- A significant positive correlation was found between the plasma TC/HDL-C ratio and the extent of carotid bifurcation atherosclerosis (p = 0.01).
- The extent of atherosclerosis showed a significant inverse correlation with plasma HDL-C concentrations (p = 0.02).
- Triglyceride concentration showed a positive correlation with atherosclerosis extent (p = 0.07), while LDL-C and TC did not correlate significantly (p > 0.1).
- Plasma lipoprotein concentrations explained only 4% of the variation in carotid bifurcation atherosclerosis extent.
Conclusions:
- The TC/HDL-C ratio and HDL-C levels are significant indicators of carotid bifurcation atherosclerosis severity.
- While other lipids like triglycerides may play a role, their association is less pronounced.
- Lipoprotein concentrations have a limited role in explaining the overall variation in carotid atherosclerosis.
Abstract:
The severity of coronary artery atherosclerosis correlates with increased plasma concentrations of total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), and triglycerides and with decreased plasma concentrations of high-density lipoprotein cholesterol (HDL-C). The role of plasma lipoproteins in the pathogenesis of cerebral atherosclerosis, however, is less clear. Several investigators report that lipoprotein abnormalities correlate inversely with the incidence of cerebral infarction. We analyzed risk factors for carotid bifurcation atherosclerosis in 121 consecutive patients who underwent cerebral angiography. This analysis revealed a significant positive correlation between the plasma TC/HDL-C ratio and the extent of carotid bifurcation atherosclerosis (p = 0.01). The extent of atherosclerosis correlated inversely with plasma concentrations of HDL-C (p = 0.02). Triglyceride concentration correlated positively with the extent of atherosclerosis with marginal significance (p = 0.07). LDL-C and TC concentrations did not correlate with bifurcation atherosclerosis (p greater than 0.1). Only 4% of the variation in the extent of bifurcation atherosclerosis was explicable on the basis of plasma lipoprotein concentrations.