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Plasma high density lipoproteins and coronary artery disease
Insights
High-density lipoprotein (HDL) cholesterol levels are crucial for preventing coronary artery disease (CAD). Lower HDL and reduced lecithin:cholesterol acyltransferase (LCAT) activity are linked to more severe CAD, especially in women.
Area of Science:
- Cardiovascular Medicine
- Lipid Metabolism
- Atherosclerosis Research
Background:
- Coronary artery disease (CAD) is a major health concern.
- Plasma lipid profiles are known risk factors for atherosclerosis.
- The role of high-density lipoprotein (HDL) cholesterol in CAD requires further elucidation.
Purpose of the Study:
- To investigate the relationship between plasma lipid levels and the presence and extent of coronary artery disease (CAD).
- To identify key atherosclerosis risk factors contributing to CAD development.
- To explore the association between lecithin:cholesterol acyltransferase (LCAT) activity and CAD.
Main Methods:
- Coronary angiography was performed on 102 patients.
- Plasma lipid profiles, including HDL, LDL, and total cholesterol, were analyzed.
- Atherosclerosis risk factors and LCAT enzymatic activity were assessed.
Main Results:
- Patients with CAD had lower HDL cholesterol and higher total and LDL cholesterol compared to those without CAD.
- HDL cholesterol levels were inversely correlated with the extent of CAD (number of obstructed vessels).
- Reduced LCAT activity was associated with the presence and extent of CAD.
Conclusions:
- Elevated HDL cholesterol demonstrates a protective effect against coronary obstructive disease.
- Decreased HDL cholesterol is a significant determinant of CAD, particularly in females.
- LCAT may play a role in mobilizing cholesterol from atherosclerotic lesions, contributing to HDL's protective function.
Abstract:
Plasma lipid samples and other atherosclerosis risk factors were related to presence of extent of coronary artery disease (CAD) in 102 consecutive patients undergoing coronary angiography. Thirty-six were without CAD and 66 had angiographically documented CAD. In CAD, high density lipoprotein (HDL) cholesterol was lower and total cholesterol and low density lipoprotein cholesterol were higher than in subjects without CAD. Further, HDL was inversely related to extent of CAD (number of major obstructed vessels). Moreover, decreased HDL was the single most important determinant of CAD among all atherosclerosis risk factors (more so in females than in males). In addition, reduced plasma enzymatic activity of lecithin:cholesterol acyltransferase (LCAT) correlated with the presence and extent of angiographically shown CAD. These findings document the protective effect of elevated plasma HDL against coronary obstructive disease and suggest this salutary action may be related to LCAT mobilization of cholesterol from atherosclerotic lesions.