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Serum high density lipoprotein cholesterol in patients with abnormal coronary arteries
Insights
Patients with abnormal coronary arteries (ACA) show distinct lipoprotein profiles compared to normal coronary arteries (NCA) and controls. Lower high density lipoprotein cholesterol (HDL-C) in ACA patients correlates with increased cardiovascular risk.
Area of Science:
- Cardiovascular Medicine
- Lipidology
- Clinical Biochemistry
Background:
- Previous research linked high density lipoprotein cholesterol (HDL-C) inversely with coronary artery disease (CAD) in myocardial infarction survivors and healthy individuals.
- The relationship between HDL-C and CAD in patients with pre-existing abnormal coronary arteries (ACA) versus normal coronary arteries (NCA) remained less understood.
Purpose of the Study:
- To investigate serum HDL-C and lipoprotein profiles in patients with ACA compared to NCA and healthy control subjects (CTL).
- To determine if the inverse relationship between HDL-C and CAD holds true for individuals with ACA.
Main Methods:
- Serum lipid profiles, including HDL-C, triglycerides (TG), very low-density lipoprotein cholesterol (VLDL-C), and low-density lipoprotein cholesterol (LDL-C), were measured.
- Patients were categorized into three groups: abnormal coronary arteries (ACA), normal coronary arteries (NCA), and control subjects (CTL).
- Statistical adjustments were made, including adjusting HDL-C for serum TG, to analyze differences between groups.
Main Results:
- ACA males exhibited lower HDL-C and % HDL-C, with higher TG, VLDL-TG, LDL-C/HDL-C, and VLDL-C/HDL-C ratios compared to NCA and CTL males.
- ACA females showed lower % HDL-C and HDL-C, alongside higher LDL-C/HDL-C and VLDL-C/HDL-C ratios than CTL females.
- Adjustment for TG attenuated HDL-C differences between ACA and NCA groups, but not between ACA and CTL groups, indicating TG's role in HDL-C variations.
Conclusions:
- Patients with abnormal coronary arteries possess distinct lipoprotein profiles, characterized by lower HDL-C and altered ratios, suggesting increased cardiovascular risk.
- The findings highlight the importance of comprehensive lipoprotein analysis beyond just HDL-C levels in assessing CAD risk, especially in ACA patients.
- Lipoprotein profiles effectively differentiated between ACA, NCA, and CTL groups, underscoring their utility in patient stratification.
Abstract:
Previous studies showing the inverse relationship between high density lipoprotein cholesterol (HDL-C) and coronary artery disease were based on myocardial infarction survivors and presumably normal subjects. To determine whether a similar relationship exists between patients with abnormal coronary arteries (ACA) and those with normal coronary arteries (NCA), the serum HDL-C and other lipoproteins of these patients and those of a group of presumably healthy control subjects (CTL) were determined. The ACA males had lower HDL-C and % HDL-C but higher TG, VLDL-TG, LDL-C/HDL-C and VLDL-C/HDL-C than the NCA and CTL males. They also had higher VLDL-C and % VLDL-C than the CTL males. Adjustment of HDL-C for serum TG eliminated the difference in HDL-C between the ACA and NCA groups but that between ACA and CTL groups remained. The ACA females had lower % HDL-C than the NCA and CTL females. They also had lower HDL-C but higher LDL-C/HDL-C and VLDL-C/HDL-C than the CTL females. The NCA and CTL groups did not differ in any of the lipid variables, although the NCA group values were intermediate to those of the ACA and CTL groups. Using various lipoprotein profiles, it was possible to classify the patients into the 3 groups.