Lipoproteins and cardiovascular disease: biological basis and epidemiological studies

Area of Science:

• Cardiovascular Disease Epidemiology
• Lipoprotein Metabolism
• Atherosclerosis Pathogenesis

Background:

• Extensive laboratory evidence links cholesterol and lipoproteins to atherosclerosis.
• Epidemiological studies have established associations between lipid abnormalities and myocardial infarction risk.

Purpose of the Study:

• To highlight the limitations of total cholesterol alone in predicting cardiac risk.
• To emphasize the importance of characterizing lipoprotein profiles, including HDL cholesterol and total to HDL ratio.
• To underscore the significance of identifying and managing associated clinical syndromes for cardiovascular risk reduction.

Main Methods:

• Review of existing laboratory and epidemiological evidence.
• Characterization of serum lipid abnormalities and their association with myocardial infarction.
• Identification of clinical syndromes associated with increased cardiac risk.

Main Results:

• Elevated total cholesterol is associated with increased myocardial infarction risk, but is insufficient for adequate risk prediction.
• High-density lipoprotein (HDL) cholesterol levels and the total cholesterol to HDL ratio are critical for accurate cardiac risk assessment.
• Clinical syndromes like the 'deadly quartet' (insulin resistance, central obesity, high triglycerides, hypertension) significantly increase cardiac risk.

Conclusions:

• Accurate cardiovascular risk prediction requires detailed lipoprotein analysis beyond total cholesterol.
• Management of associated metabolic risk factors and clinical syndromes is essential for comprehensive cardiac care.
• Optimizing current therapies and clinical practice is vital given the morbidity and economic impact of cardiovascular disease.