Small, dense, low-density lipoprotein and atherosclerosis

Area of Science:

• Cardiovascular Medicine
• Clinical Chemistry
• Biochemistry

Background:

• Low-density lipoprotein (LDL) and high-density lipoprotein (HDL) subclass distribution disorders are significant contributors to coronary artery disease (CAD).
• Elevated low-density lipoprotein cholesterol (LDLC) alone is less indicative of CAD risk than subclass abnormalities.
• Current routine blood tests may not identify all metabolic contributors to CAD.

Purpose of the Study:

• To highlight the clinical significance of LDL and HDL subclass distribution in patient management.
• To emphasize the need for standardized laboratory methods for subclass analysis.
• To underscore the limitations of conventional lipid profiles in detecting CAD risk factors.

Main Methods:

• Laboratory determination of LDL and HDL subclass distribution using analytic ultracentrifugation or polyacrylamide gradient gel electrophoresis.
• Review of recent research emphasizing the role of subclass distribution in CAD.
• Analysis of findings from electron beam computed tomography in asymptomatic individuals.

Main Results:

• Disorders in LDL and HDL subclass distribution are more prevalent contributors to CAD than elevated LDLC.
• A significant proportion of individuals with established CAD have normal lipid levels according to National Cholesterol Education Program (NCEP) criteria.
• Subclass analysis is crucial for identifying metabolic abnormalities not detected by routine lipid tests.

Conclusions:

• LDL and HDL subclass distribution is a critical factor in CAD pathogenesis and patient management.
• Standardized quality control and research standards are essential for reliable subclass testing.
• Further research and clinical application of subclass analysis are necessary for comprehensive CAD risk assessment.