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Updated: Nov 29, 2025
Author Spotlight: Exploring the Relationship Between Lipotoxicity and HFpEF
Published on: March 29, 2024
The Effect of Blood Lipids on the Left Ventricle: A Mendelian Randomization Study
Nay Aung1, Mihir M Sanghvi1, Stefan K Piechnik2
1William Harvey Research Institute, Queen Mary University of London, London, United Kingdom; National Institute for Health Research Barts Cardiovascular Biomedical Research Centre, Queen Mary University of London, London, United Kingdom; Barts Heart Centre, St. Bartholomew's Hospital, Barts Health NHS Trust, London, United Kingdom.
Insights
Higher low-density lipoprotein (LDL) cholesterol and triglycerides are causally linked to adverse changes in heart structure, specifically left ventricular (LV) mass. These findings highlight a potential role beyond atherosclerosis in cardiovascular disease development.
Area of Science:
- Cardiovascular genetics
- Lipid metabolism
- Cardiac imaging
Background:
- Cholesterol and triglycerides are established risk factors for cardiovascular disease.
- The causal relationship between lipid levels and specific cardiac parameters requires further investigation.
Purpose of the Study:
- To determine if elevated low-density lipoprotein (LDL) cholesterol and triglyceride levels, and reduced high-density lipoprotein (HDL) cholesterol, causally influence left ventricular (LV) parameters.
- To assess the impact of lipid profiles on cardiac structure and function.
Main Methods:
- Utilized one-sample Mendelian randomization (MR) with UK Biobank data (n=17,311) for paired lipid and cardiovascular magnetic resonance data.
- Employed two-sample MR with summary-level data from the Global Lipid Genetics Consortium and UK Biobank for sensitivity analyses.
Main Results:
- One-sample MR revealed causal associations between higher LDL cholesterol and increased LV end-diastolic volume and LV mass.
- Elevated triglycerides were causally linked to increased LV mass.
- High-density lipoprotein cholesterol showed no significant association with LV parameters.
- Mendelian randomization results differed from observational analyses.
Conclusions:
- Mendelian randomization analysis indicates that LDL cholesterol and triglycerides are associated with adverse cardiac structural and functional changes, particularly affecting LV mass.
- These findings suggest a causal role for LDL cholesterol and triglycerides in cardiac morphology, beyond their known role in atherosclerosis.
- The study underscores the importance of lipid management in cardiovascular health.
Background:
Cholesterol and triglycerides are among the most well-known risk factors for cardiovascular disease.
Objectives:
This study investigated whether higher low-density lipoprotein (LDL) cholesterol and triglyceride levels and lower high-density lipoprotein cholesterol level are causal risk factors for changes in prognostically important left ventricular (LV) parameters.
Methods:
One-sample Mendelian randomization (MR) of 17,311 European individuals from the UK Biobank with paired lipid and cardiovascular magnetic resonance data was performed. Two-sample MR was performed by using summary-level data from the Global Lipid Genetics Consortium (n = 188,577) and UK Biobank Cardiovascular Magnetic Resonance substudy (n = 16,923) for sensitivity analyses.
Results:
In 1-sample MR analysis, higher LDL cholesterol was causally associated with higher LV end-diastolic volume (β = 1.85 ml; 95% confidence interval [CI]: 0.59 to 3.14 ml; p = 0.004) and higher LV mass (β = 0.81 g; 95% CI: 0.11 to 1.51 g; p = 0.023) and triglycerides with higher LV mass (β = 1.37 g; 95% CI: 0.45 to 2.3 g; p = 0.004). High-density lipoprotein cholesterol had no significant association with any LV parameter. Similar results were obtained by using 2-sample MR. Observational analyses were frequently discordant with those derived from MR.
Conclusions:
MR analysis demonstrates that LDL cholesterol and triglycerides are associated with adverse changes in cardiac structure and function, in particular in relation to LV mass. These findings suggest that LDL cholesterol and triglycerides may have a causal effect in influencing cardiac morphology in addition to their established role in atherosclerosis.
