Cholesterol levels and cardiovascular risk
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Total Cholesterol Levels and Cardiovascular Disease Risk
High total cholesterol is a well-established risk factor for cardiovascular disease (CVD) and cardiovascular mortality. Large-scale analyses show that higher total cholesterol levels are associated with increased risk of CVD death, while higher high-density lipoprotein cholesterol (HDL-C) is generally linked to lower risk . However, the relationship is not uniform across all cholesterol types and levels.
LDL Cholesterol (LDL-C) and Cardiovascular Mortality
Elevated low-density lipoprotein cholesterol (LDL-C) is consistently associated with higher risk of CVD and cardiovascular mortality Jung2022Rong2022Hsu2021. Both very high and very low LDL-C levels are linked to increased mortality, suggesting that maintaining LDL-C within an optimal range is important for long-term health . Increases in LDL-C over time also raise the risk of cardiovascular events Hsu2021Jeong2018.
HDL Cholesterol (HDL-C): Protective and Paradoxical Effects
Traditionally, higher HDL-C has been considered protective against CVD . However, recent studies reveal a U-shaped relationship: both low and very high HDL-C levels are associated with increased risk of cardiovascular events and mortality Liu2022Hirata2018Trimarco2022. This paradoxical effect is especially evident in individuals with coronary artery disease or hypertension, and the increased risk with very high HDL-C is more pronounced in men Liu2022Hirata2018Trimarco2022.
Changes in Cholesterol Levels Over Time
Rising cholesterol levels, especially total cholesterol and LDL-C, over time are linked to higher risk of cardiovascular events Hsu2021Jeong2018. Conversely, lowering cholesterol levels, particularly in young adults, is associated with reduced risk of ischemic heart disease and cerebrovascular disease . These findings highlight the importance of monitoring and managing cholesterol changes, not just baseline levels.
Sex Differences in Cholesterol-Related Cardiovascular Risk
The impact of high total cholesterol on coronary heart disease (CHD) risk is slightly stronger in men than in women, but both sexes are affected . Raised total cholesterol has little effect on the risk of total stroke in either sex .
Remnant Cholesterol and Triglycerides
Cholesterol carried in triglyceride-rich lipoproteins, known as remnant cholesterol, is also a significant risk factor for atherosclerotic cardiovascular disease. Elevated remnant cholesterol and high plasma triglycerides are associated with a two-fold increase in cardiovascular mortality .
Lipoprotein(a) and LDL-C Interaction
Elevated lipoprotein(a) [Lp(a)] is an independent risk factor for CVD. However, the risk associated with high Lp(a) is reduced when LDL-C levels are very low, suggesting that lowering LDL-C can help mitigate the risk from high Lp(a) .
Conclusion
Cholesterol levels play a crucial role in cardiovascular risk. High total cholesterol, LDL-C, and remnant cholesterol increase the risk of cardiovascular events and mortality. While higher HDL-C is generally protective, very high levels may paradoxically increase risk, especially in certain populations. Both increases and decreases in cholesterol over time impact cardiovascular outcomes, emphasizing the need for regular monitoring and individualized management. Maintaining cholesterol within optimal ranges is key to reducing cardiovascular risk.
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