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High density lipoprotein free cholesterol and other lipids in coronary heart disease
Insights
Free cholesterol in high-density lipoproteins (HDL-fc) is a key indicator for distinguishing coronary heart disease (CHD) risk. Measuring HDL-fc alongside HDL esterified cholesterol significantly improves CHD prediction accuracy.
Area of Science:
- Cardiovascular Medicine
- Lipid Metabolism
- Biochemistry
Background:
- High-density lipoproteins (HDL) play a crucial role in reverse cholesterol transport.
- Dyslipidemia is a significant risk factor for coronary heart disease (CHD).
- Understanding specific HDL components' association with CHD is vital for risk assessment.
Purpose of the Study:
- To identify the most discriminative parameter within HDL for coronary heart disease (CHD).
- To evaluate the combined predictive power of HDL fractions for CHD risk.
- To assess the role of free cholesterol in HDL (HDL-fc) as a CHD predictor.
Main Methods:
- Quantification of cholesterol and phospholipid fractions in HDL from healthy males and male CHD patients.
- Application of one-variable and two-variable discriminant function analysis (DFA).
- Comparison of discriminative power among different HDL parameters.
Main Results:
- HDL free cholesterol (HDL-fc) demonstrated the highest discriminative power between controls and CHD patients (mean levels: 6.6 vs. 4.4 mg/dl).
- One-variable DFA using HDL-fc yielded a 27% error rate for classification.
- Two-variable DFA incorporating HDL esterified cholesterol and HDL-fc reduced the error rate to 11%.
Conclusions:
- HDL free cholesterol (HDL-fc) is a significant discriminator for coronary heart disease (CHD).
- Combined analysis of HDL-fc and HDL esterified cholesterol enhances CHD risk prediction.
- HDL-fc may serve as a valuable predictor for assessing CHD risk.
Abstract:
The cholesterol and choline-containing phospholipid fractions of high density lipoproteins (HDL) were determined in healthy males and in male patients with coronary heart disease (CHD) to ascertain which HDL parameter or combined parameters possess the greatest discriminative power. The free cholesterol fraction (HDL-fc) was found to be the most significant discriminator between controls and males with CHD, the mean levels (+/- SEM) being 6.6 (+/- 0.9) and 4.4 (+/- 0.6) mg/dl, respectively. Classification of CHD patients and controls using one-variable discriminant function analysis (DFA) yielded an error rate of 27% for plasma HDL-fc. Two-variable DFA using both the HDL esterified cholesterol levels and the HDL-fc levels of controls and patients reduced the error rate to 11%. The results obtained in this study indicate a possible role for HDL-fc as a predictor of CHD risk.