The LDL cumulative exposure hypothesis: evidence and practical applications.

Area of Science:

• Cardiovascular Medicine
• Lipid Metabolism
• Atherosclerosis Research

Background:

• Atherosclerosis is caused by the trapping of low-density lipoprotein (LDL) and other apolipoprotein B-containing lipoproteins in artery walls.
• Increased LDL trapping leads to plaque buildup, raising the risk of acute cardiovascular events.
• The biological impact of LDL on atherosclerotic cardiovascular disease (ASCVD) risk is determined by both exposure magnitude and duration.

Purpose of the Study:

• To provide a comprehensive overview of the LDL cumulative exposure hypothesis for ASCVD prevention.
• To discuss the benefits of sustained low LDL-cholesterol (LDL-C) levels.
• To inform clinical practice guidelines and the design of ASCVD prevention strategies.

Main Methods:

• The review synthesizes current understanding of LDL trapping and atherosclerosis progression.
• It introduces cumulative LDL exposure as a biomarker for cardiovascular risk.
• The hypothesis proposes titrating LDL-C lowering based on cumulative exposure thresholds.

Main Results:

• Cumulative LDL exposure, calculated by summing LDL-C measurements over time, quantifies both magnitude and duration of exposure.
• This biomarker aids in estimating the absolute risk of acute cardiovascular events.
• Maintaining low cumulative LDL exposure is shown to slow atherosclerosis progression and reduce lifetime ASCVD risk.

Conclusions:

• The LDL cumulative exposure hypothesis offers a novel framework for guiding ASCVD prevention.
• Sustained low LDL-C levels significantly reduce the lifetime risk of ASCVD events.
• This approach can inform clinical guidelines and the development of new prevention programs and trials.